 # Problem doing multiple independent plots

Below is a simplified version of a much more elaborate analysis code, but it will illustrate the problem I?m having. What I want to do is repetitively call an analysis function from my main code and plot the results of that analysis (a curve fit, although thats immaterial here) while in that function. Back in the main code, I want to plot the results of all the curve fits on a single plot. They share a common x axis, but appear at different points along it. What seems to be happening is that the gets set in the function, and doesn?t get set back in the main code.

Note that there are two versions of the ?problem? function, problem and problem_alt. If you change the main code (move the #), you get the plot I want at the end of the main.

There must be something I can call or set to recover the settings associated with figure(2), but I can?t seem to figure it out. Any help would be appreciated.

Thanks,
Bill Wing

#! /usr/bin/env python
# -*- coding: utf-8 -*-

···

#
# A simple skeleton of the program to work out the plotting problem
#
import numpy as np, matplotlib.pyplot as plt
#
# skeleton subroutines
#

def problem(xdata, ydata, i):
color_dic = {1: "red", 2: "green", 3: "blue", 4: "cyan"}
plt.figure(1)
fig1, ax1 = plt.subplots()
plt.subplot()
plt.plot(xdata, ydata, linestyle = '-', color = color_dic[i])
plt.savefig('Plot for run_num ' + str(i))
return

def problem_alt(xdata, ydata, i):
return

t = np.arange(0.0, 2.0, 0.01)
plt.figure(2)
fig2, ax2 = plt.subplots()

for i in range(0,4):
i = i+1
problem(t, np.sin(i*np.pi*3*t), i)
problem_alt(t, np.sin(i*np.pi*3*t), i)
ax2.set_xlim(xmin = 0.0, xmax = 20.0)
plt.subplot()
plt.plot((t+i*3), np.sin(i*np.pi*3*(t+i*3)))

plt.savefig("Global Plot")

William,

Don't use plt to call all of the methods, but directly use them off of the
Figure (e.g. fig1) and Axes (e.g. ax1) instances you create:

import numpy as np, matplotlib.pyplot as plt

def problem(xdata, ydata, i):
color_dic = {1: "red", 2: "green", 3: "blue", 4: "cyan"}
fig1, ax1 = plt.subplots()
ax1.plot(xdata, ydata, linestyle = '-', color = color_dic[i])
fig1.savefig('Plot for run_num ' + str(i))
return

def problem_alt(xdata, ydata, i):
return

t = np.arange(0.0, 2.0, 0.01)
fig2, ax2 = plt.subplots()

for i in range(0,4):
i = i+1
problem(t, np.sin(i*np.pi*3*t), i)
problem_alt(t, np.sin(i*np.pi*3*t), i)
ax2.set_xlim(xmin = 0.0, xmax = 20.0)
ax2.plot((t+i*3), np.sin(i*np.pi*3*(t+i*3)))

fig2.savefig("Global Plot")

At least, I think that's what you're going for. Note I removed some extra
calls to figure() and subplot() that I don't think were helping you.

Ryan

···

On Tue, Sep 26, 2017 at 3:04 PM, William Ray Wing <wrw at mac.com> wrote:

Below is a simplified version of a much more elaborate analysis code, but
it will illustrate the problem I?m having. What I want to do is
repetitively call an analysis function from my main code and plot the
results of that analysis (a curve fit, although thats immaterial here)
while in that function. Back in the main code, I want to plot the results
of all the curve fits on a single plot. They share a common x axis, but
appear at different points along it. What seems to be happening is that
the gets set in the function, and doesn?t get set back in the main code.

Note that there are two versions of the ?problem? function, problem and
problem_alt. If you change the main code (move the #), you get the plot I
want at the end of the main.

There must be something I can call or set to recover the settings
associated with figure(2), but I can?t seem to figure it out. Any help
would be appreciated.

Thanks,
Bill Wing

#! /usr/bin/env python
# -*- coding: utf-8 -*-
#
# A simple skeleton of the program to work out the plotting problem
#
import numpy as np, matplotlib.pyplot as plt
#
# skeleton subroutines
#

def problem(xdata, ydata, i):
color_dic = {1: "red", 2: "green", 3: "blue", 4: "cyan"}
plt.figure(1)
fig1, ax1 = plt.subplots()
plt.subplot()
plt.plot(xdata, ydata, linestyle = '-', color = color_dic[i])
plt.savefig('Plot for run_num ' + str(i))
return

def problem_alt(xdata, ydata, i):
return

t = np.arange(0.0, 2.0, 0.01)
plt.figure(2)
fig2, ax2 = plt.subplots()

for i in range(0,4):
i = i+1
problem(t, np.sin(i*np.pi*3*t), i)
problem_alt(t, np.sin(i*np.pi*3*t), i)
ax2.set_xlim(xmin = 0.0, xmax = 20.0)
plt.subplot()
plt.plot((t+i*3), np.sin(i*np.pi*3*(t+i*3)))

plt.savefig("Global Plot")

_______________________________________________
Matplotlib-users mailing list
Matplotlib-users at python.org
https://mail.python.org/mailman/listinfo/matplotlib-users

--
Ryan May
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William,

Don't use plt to call all of the methods, but directly use them off of the Figure (e.g. fig1) and Axes (e.g. ax1) instances you create:

Thanks, that did it. Very grateful.

Parenthetically, I wish there were a matplotlib book that explained the underlying logic of mil plotting. Every one I?ve looked into so far is full of specific cookbook examples, but they don?t explain what the various calls really do, what order they need to be called in (and why), and how they affect each other. Cookbooks are fine for doing things by rote, but they don?t provide understanding. If anyone on this list knows of such a book, I?d really appreciate hearing.

Thanks,
Bill

import numpy as np, matplotlib.pyplot as plt

def problem(xdata, ydata, i):
color_dic = {1: "red", 2: "green", 3: "blue", 4: "cyan"}
fig1, ax1 = plt.subplots()
ax1.plot(xdata, ydata, linestyle = '-', color = color_dic[i])
fig1.savefig('Plot for run_num ' + str(i))
return

def problem_alt(xdata, ydata, i):
return

t = np.arange(0.0, 2.0, 0.01)
fig2, ax2 = plt.subplots()

for i in range(0,4):
i = i+1
problem(t, np.sin(i*np.pi*3*t), i)
problem_alt(t, np.sin(i*np.pi*3*t), i)
ax2.set_xlim(xmin = 0.0, xmax = 20.0)
ax2.plot((t+i*3), np.sin(i*np.pi*3*(t+i*3)))

fig2.savefig("Global Plot")

At least, I think that's what you're going for. Note I removed some extra calls to figure() and subplot() that I don't think were helping you.

Ryan

Below is a simplified version of a much more elaborate analysis code, but it will illustrate the problem I?m having. What I want to do is repetitively call an analysis function from my main code and plot the results of that analysis (a curve fit, although thats immaterial here) while in that function. Back in the main code, I want to plot the results of all the curve fits on a single plot. They share a common x axis, but appear at different points along it. What seems to be happening is that the gets set in the function, and doesn?t get set back in the main code.

Note that there are two versions of the ?problem? function, problem and problem_alt. If you change the main code (move the #), you get the plot I want at the end of the main.

There must be something I can call or set to recover the settings associated with figure(2), but I can?t seem to figure it out. Any help would be appreciated.

Thanks,
Bill Wing

#! /usr/bin/env python
# -*- coding: utf-8 -*-
#
# A simple skeleton of the program to work out the plotting problem
#
import numpy as np, matplotlib.pyplot as plt
#
# skeleton subroutines
#

def problem(xdata, ydata, i):
color_dic = {1: "red", 2: "green", 3: "blue", 4: "cyan"}
plt.figure(1)
fig1, ax1 = plt.subplots()
plt.subplot()
plt.plot(xdata, ydata, linestyle = '-', color = color_dic[i])
plt.savefig('Plot for run_num ' + str(i))
return

def problem_alt(xdata, ydata, i):
return

t = np.arange(0.0, 2.0, 0.01)
plt.figure(2)
fig2, ax2 = plt.subplots()

for i in range(0,4):
i = i+1
problem(t, np.sin(i*np.pi*3*t), i)
problem_alt(t, np.sin(i*np.pi*3*t), i)
ax2.set_xlim(xmin = 0.0, xmax = 20.0)
plt.subplot()
plt.plot((t+i*3), np.sin(i*np.pi*3*(t+i*3)))

plt.savefig("Global Plot")

_______________________________________________
Matplotlib-users mailing list
Matplotlib-users at python.org <mailto:Matplotlib-users at python.org>
https://mail.python.org/mailman/listinfo/matplotlib-users

--
Ryan May

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···

On Sep 26, 2017, at 6:20 PM, Ryan May <rmay31 at gmail.com> wrote:
On Tue, Sep 26, 2017 at 3:04 PM, William Ray Wing <wrw at mac.com <mailto:wrw at mac.com>> wrote:

You might want to check out my Anatomy of Matplotlib tutorial:
https://github.com/matplotlib/AnatomyOfMatplotlib

You can use the Jupyter notebooks and follow along with the recordings
2017) and https://www.youtube.com/watch?v=MKucn8NtVeI (Scipy 2015 - which
covered more, but spent less time on each aspect).

There is also a book, "Mastering Matplotlib", which goes into deep depths
with respect to the API and logic behind the library:
https://www.amazon.com/Mastering-matplotlib-Duncan-M-McGreggor/dp/1783987545

I hope that helps!
Ben Root

···

On Wed, Sep 27, 2017 at 8:37 AM, William Ray Wing <wrw at mac.com> wrote:

On Sep 26, 2017, at 6:20 PM, Ryan May <rmay31 at gmail.com> wrote:

William,

Don't use plt to call all of the methods, but directly use them off of the
Figure (e.g. fig1) and Axes (e.g. ax1) instances you create:

Thanks, that did it. Very grateful.

Parenthetically, I wish there were a matplotlib book that explained the
underlying logic of mil plotting. Every one I?ve looked into so far is
full of specific cookbook examples, but they don?t explain what the various
calls really do, what order they need to be called in (and why), and how
they affect each other. Cookbooks are fine for doing things by rote, but
they don?t provide understanding. If anyone on this list knows of such a
book, I?d really appreciate hearing.

Thanks,
Bill

import numpy as np, matplotlib.pyplot as plt

def problem(xdata, ydata, i):
color_dic = {1: "red", 2: "green", 3: "blue", 4: "cyan"}
fig1, ax1 = plt.subplots()
ax1.plot(xdata, ydata, linestyle = '-', color = color_dic[i])
fig1.savefig('Plot for run_num ' + str(i))
return

def problem_alt(xdata, ydata, i):
return

t = np.arange(0.0, 2.0, 0.01)
fig2, ax2 = plt.subplots()

for i in range(0,4):
i = i+1
problem(t, np.sin(i*np.pi*3*t), i)
problem_alt(t, np.sin(i*np.pi*3*t), i)
ax2.set_xlim(xmin = 0.0, xmax = 20.0)
ax2.plot((t+i*3), np.sin(i*np.pi*3*(t+i*3)))

fig2.savefig("Global Plot")

At least, I think that's what you're going for. Note I removed some extra
calls to figure() and subplot() that I don't think were helping you.

Ryan

On Tue, Sep 26, 2017 at 3:04 PM, William Ray Wing <wrw at mac.com> wrote:

Below is a simplified version of a much more elaborate analysis code, but
it will illustrate the problem I?m having. What I want to do is
repetitively call an analysis function from my main code and plot the
results of that analysis (a curve fit, although thats immaterial here)
while in that function. Back in the main code, I want to plot the results
of all the curve fits on a single plot. They share a common x axis, but
appear at different points along it. What seems to be happening is that
the gets set in the function, and doesn?t get set back in the main code.

Note that there are two versions of the ?problem? function, problem and
problem_alt. If you change the main code (move the #), you get the plot I
want at the end of the main.

There must be something I can call or set to recover the settings
associated with figure(2), but I can?t seem to figure it out. Any help
would be appreciated.

Thanks,
Bill Wing

#! /usr/bin/env python
# -*- coding: utf-8 -*-
#
# A simple skeleton of the program to work out the plotting problem
#
import numpy as np, matplotlib.pyplot as plt
#
# skeleton subroutines
#

def problem(xdata, ydata, i):
color_dic = {1: "red", 2: "green", 3: "blue", 4: "cyan"}
plt.figure(1)
fig1, ax1 = plt.subplots()
plt.subplot()
plt.plot(xdata, ydata, linestyle = '-', color = color_dic[i])
plt.savefig('Plot for run_num ' + str(i))
return

def problem_alt(xdata, ydata, i):
return

t = np.arange(0.0, 2.0, 0.01)
plt.figure(2)
fig2, ax2 = plt.subplots()

for i in range(0,4):
i = i+1
problem(t, np.sin(i*np.pi*3*t), i)
problem_alt(t, np.sin(i*np.pi*3*t), i)
ax2.set_xlim(xmin = 0.0, xmax = 20.0)
plt.subplot()
plt.plot((t+i*3), np.sin(i*np.pi*3*(t+i*3)))

plt.savefig("Global Plot")

_______________________________________________
Matplotlib-users mailing list
Matplotlib-users at python.org
https://mail.python.org/mailman/listinfo/matplotlib-users

--
Ryan May

_______________________________________________
Matplotlib-users mailing list
Matplotlib-users at python.org
https://mail.python.org/mailman/listinfo/matplotlib-users

-------------- next part --------------
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You might want to check out my Anatomy of Matplotlib tutorial: https://github.com/matplotlib/AnatomyOfMatplotlib

You can use the Jupyter notebooks and follow along with the recordings available on YouTube: https://www.youtube.com/watch?v=rARMKS8jE9g (Scipy 2017) and https://www.youtube.com/watch?v=MKucn8NtVeI (Scipy 2015 - which covered more, but spent less time on each aspect).

There is also a book, "Mastering Matplotlib", which goes into deep depths with respect to the API and logic behind the library: https://www.amazon.com/Mastering-matplotlib-Duncan-M-McGreggor/dp/1783987545

Thanks, that book may be just what I?ve been searching for. I?ll check it out.
Bill

I hope that helps!
Ben Root

William,

Don't use plt to call all of the methods, but directly use them off of the Figure (e.g. fig1) and Axes (e.g. ax1) instances you create:

Thanks, that did it. Very grateful.

Parenthetically, I wish there were a matplotlib book that explained the underlying logic of mil plotting. Every one I?ve looked into so far is full of specific cookbook examples, but they don?t explain what the various calls really do, what order they need to be called in (and why), and how they affect each other. Cookbooks are fine for doing things by rote, but they don?t provide understanding. If anyone on this list knows of such a book, I?d really appreciate hearing.

Thanks,
Bill

import numpy as np, matplotlib.pyplot as plt

def problem(xdata, ydata, i):
color_dic = {1: "red", 2: "green", 3: "blue", 4: "cyan"}
fig1, ax1 = plt.subplots()
ax1.plot(xdata, ydata, linestyle = '-', color = color_dic[i])
fig1.savefig('Plot for run_num ' + str(i))
return

def problem_alt(xdata, ydata, i):
return

t = np.arange(0.0, 2.0, 0.01)
fig2, ax2 = plt.subplots()

for i in range(0,4):
i = i+1
problem(t, np.sin(i*np.pi*3*t), i)
problem_alt(t, np.sin(i*np.pi*3*t), i)
ax2.set_xlim(xmin = 0.0, xmax = 20.0)
ax2.plot((t+i*3), np.sin(i*np.pi*3*(t+i*3)))

fig2.savefig("Global Plot")

At least, I think that's what you're going for. Note I removed some extra calls to figure() and subplot() that I don't think were helping you.

Ryan

Below is a simplified version of a much more elaborate analysis code, but it will illustrate the problem I?m having. What I want to do is repetitively call an analysis function from my main code and plot the results of that analysis (a curve fit, although thats immaterial here) while in that function. Back in the main code, I want to plot the results of all the curve fits on a single plot. They share a common x axis, but appear at different points along it. What seems to be happening is that the gets set in the function, and doesn?t get set back in the main code.

Note that there are two versions of the ?problem? function, problem and problem_alt. If you change the main code (move the #), you get the plot I want at the end of the main.

There must be something I can call or set to recover the settings associated with figure(2), but I can?t seem to figure it out. Any help would be appreciated.

Thanks,
Bill Wing

#! /usr/bin/env python
# -*- coding: utf-8 -*-
#
# A simple skeleton of the program to work out the plotting problem
#
import numpy as np, matplotlib.pyplot as plt
#
# skeleton subroutines
#

def problem(xdata, ydata, i):
color_dic = {1: "red", 2: "green", 3: "blue", 4: "cyan"}
plt.figure(1)
fig1, ax1 = plt.subplots()
plt.subplot()
plt.plot(xdata, ydata, linestyle = '-', color = color_dic[i])
plt.savefig('Plot for run_num ' + str(i))
return

def problem_alt(xdata, ydata, i):
return

t = np.arange(0.0, 2.0, 0.01)
plt.figure(2)
fig2, ax2 = plt.subplots()

for i in range(0,4):
i = i+1
problem(t, np.sin(i*np.pi*3*t), i)
problem_alt(t, np.sin(i*np.pi*3*t), i)
ax2.set_xlim(xmin = 0.0, xmax = 20.0)
plt.subplot()
plt.plot((t+i*3), np.sin(i*np.pi*3*(t+i*3)))

plt.savefig("Global Plot")

_______________________________________________
Matplotlib-users mailing list
Matplotlib-users at python.org <mailto:Matplotlib-users at python.org>
https://mail.python.org/mailman/listinfo/matplotlib-users

--
Ryan May

_______________________________________________
Matplotlib-users mailing list
Matplotlib-users at python.org <mailto:Matplotlib-users at python.org>
https://mail.python.org/mailman/listinfo/matplotlib-users

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···

On Sep 27, 2017, at 9:44 AM, Benjamin Root <ben.v.root at gmail.com> wrote:
On Wed, Sep 27, 2017 at 8:37 AM, William Ray Wing <wrw at mac.com <mailto:wrw at mac.com>> wrote:

On Sep 26, 2017, at 6:20 PM, Ryan May <rmay31 at gmail.com <mailto:rmay31 at gmail.com>> wrote:
On Tue, Sep 26, 2017 at 3:04 PM, William Ray Wing <wrw at mac.com <mailto:wrw at mac.com>> wrote:

Hi William,

Did you see the tutorials and the external ressources pages on the Matplotlib website?
http://matplotlib.org/devdocs/tutorials/index.html
http://matplotlib.org/devdocs/resources/index.html

I am giving you the "testing" (devdocs) version because the documentation went through a lot of improvements (IMO ;)) for our incoming 2.1 version. But you should be able to find similar pages even on the non-devdocs web site if you prefer to use this one.

Besides, with an interactive shell like IPython, you can easily get the documentation associated with a peculiar command by postpending a question mark to it (`command_i_want_to_better_know?`) and if you are using an IDE like Spyder, this kind of software usually provides a way to display the same information (click on the command and then Ctrl-I if I remember correctly in the case of Spyder).

Regards,

···

On September 27, 2017 5:37:06 AM PDT, William Ray Wing <wrw at mac.com> wrote:

On Sep 26, 2017, at 6:20 PM, Ryan May <rmay31 at gmail.com> wrote:

William,

Don't use plt to call all of the methods, but directly use them off

of the Figure (e.g. fig1) and Axes (e.g. ax1) instances you create:

Thanks, that did it. Very grateful.

Parenthetically, I wish there were a matplotlib book that explained the
underlying logic of mil plotting. Every one I?ve looked into so far is
full of specific cookbook examples, but they don?t explain what the
various calls really do, what order they need to be called in (and
why), and how they affect each other. Cookbooks are fine for doing
things by rote, but they don?t provide understanding. If anyone on this
list knows of such a book, I?d really appreciate hearing.

Thanks,
Bill

import numpy as np, matplotlib.pyplot as plt

def problem(xdata, ydata, i):
color_dic = {1: "red", 2: "green", 3: "blue", 4: "cyan"}
fig1, ax1 = plt.subplots()
ax1.plot(xdata, ydata, linestyle = '-', color = color_dic[i])
fig1.savefig('Plot for run_num ' + str(i))
return

def problem_alt(xdata, ydata, i):
return

t = np.arange(0.0, 2.0, 0.01)
fig2, ax2 = plt.subplots()

for i in range(0,4):
i = i+1
problem(t, np.sin(i*np.pi*3*t), i)
problem_alt(t, np.sin(i*np.pi*3*t), i)
ax2.set_xlim(xmin = 0.0, xmax = 20.0)
ax2.plot((t+i*3), np.sin(i*np.pi*3*(t+i*3)))

fig2.savefig("Global Plot")

At least, I think that's what you're going for. Note I removed some

extra calls to figure() and subplot() that I don't think were helping
you.

Ryan

On Tue, Sep 26, 2017 at 3:04 PM, William Ray Wing <wrw at mac.com ><mailto:wrw at mac.com>> wrote:
Below is a simplified version of a much more elaborate analysis code,

but it will illustrate the problem I?m having. What I want to do is
repetitively call an analysis function from my main code and plot the
results of that analysis (a curve fit, although thats immaterial here)
while in that function. Back in the main code, I want to plot the
results of all the curve fits on a single plot. They share a common x
axis, but appear at different points along it. What seems to be
happening is that the gets set in the function, and doesn?t get set
back in the main code.

Note that there are two versions of the ?problem? function, problem

and problem_alt. If you change the main code (move the #), you get the
plot I want at the end of the main.

There must be something I can call or set to recover the settings

associated with figure(2), but I can?t seem to figure it out. Any help
would be appreciated.

Thanks,
Bill Wing

#! /usr/bin/env python
# -*- coding: utf-8 -*-
#
# A simple skeleton of the program to work out the plotting problem
#
import numpy as np, matplotlib.pyplot as plt
#
# skeleton subroutines
#

def problem(xdata, ydata, i):
color_dic = {1: "red", 2: "green", 3: "blue", 4: "cyan"}
plt.figure(1)
fig1, ax1 = plt.subplots()
plt.subplot()
plt.plot(xdata, ydata, linestyle = '-', color = color_dic[i])
plt.savefig('Plot for run_num ' + str(i))
return

def problem_alt(xdata, ydata, i):
return

t = np.arange(0.0, 2.0, 0.01)
plt.figure(2)
fig2, ax2 = plt.subplots()

for i in range(0,4):
i = i+1
problem(t, np.sin(i*np.pi*3*t), i)
problem_alt(t, np.sin(i*np.pi*3*t), i)
ax2.set_xlim(xmin = 0.0, xmax = 20.0)
plt.subplot()
plt.plot((t+i*3), np.sin(i*np.pi*3*(t+i*3)))

plt.savefig("Global Plot")

_______________________________________________
Matplotlib-users mailing list
Matplotlib-users at python.org <mailto:Matplotlib-users at python.org>
https://mail.python.org/mailman/listinfo/matplotlib-users

--
Ryan May

--
Envoy? de mon appareil Android avec Courriel K-9 Mail. Veuillez excuser ma bri?vet?.

Bill,

Where on the matplotlib website would you have expected to find this
information?

Asking not to be passive aggressive, but so we can update the docs to put
this information there so the next person can find it Tom

···

On Wed, Sep 27, 2017 at 8:23 AM William Ray Wing <wrw at mac.com> wrote:

On Sep 27, 2017, at 9:44 AM, Benjamin Root <ben.v.root at gmail.com> wrote:

You might want to check out my Anatomy of Matplotlib tutorial:
https://github.com/matplotlib/AnatomyOfMatplotlib

You can use the Jupyter notebooks and follow along with the recordings
2017) and https://www.youtube.com/watch?v=MKucn8NtVeI (Scipy 2015 -
which covered more, but spent less time on each aspect).

There is also a book, "Mastering Matplotlib", which goes into deep depths
with respect to the API and logic behind the library:
https://www.amazon.com/Mastering-matplotlib-Duncan-M-McGreggor/dp/1783987545

Thanks, that book may be just what I?ve been searching for. I?ll check it
out.
Bill

I hope that helps!
Ben Root

On Wed, Sep 27, 2017 at 8:37 AM, William Ray Wing <wrw at mac.com> wrote:

On Sep 26, 2017, at 6:20 PM, Ryan May <rmay31 at gmail.com> wrote:

William,

Don't use plt to call all of the methods, but directly use them off of
the Figure (e.g. fig1) and Axes (e.g. ax1) instances you create:

Thanks, that did it. Very grateful.

Parenthetically, I wish there were a matplotlib book that explained the
underlying logic of mil plotting. Every one I?ve looked into so far is
full of specific cookbook examples, but they don?t explain what the various
calls really do, what order they need to be called in (and why), and how
they affect each other. Cookbooks are fine for doing things by rote, but
they don?t provide understanding. If anyone on this list knows of such a
book, I?d really appreciate hearing.

Thanks,
Bill

import numpy as np, matplotlib.pyplot as plt

def problem(xdata, ydata, i):
color_dic = {1: "red", 2: "green", 3: "blue", 4: "cyan"}
fig1, ax1 = plt.subplots()
ax1.plot(xdata, ydata, linestyle = '-', color = color_dic[i])
fig1.savefig('Plot for run_num ' + str(i))
return

def problem_alt(xdata, ydata, i):
return

t = np.arange(0.0, 2.0, 0.01)
fig2, ax2 = plt.subplots()

for i in range(0,4):
i = i+1
problem(t, np.sin(i*np.pi*3*t), i)
problem_alt(t, np.sin(i*np.pi*3*t), i)
ax2.set_xlim(xmin = 0.0, xmax = 20.0)
ax2.plot((t+i*3), np.sin(i*np.pi*3*(t+i*3)))

fig2.savefig("Global Plot")

At least, I think that's what you're going for. Note I removed some extra
calls to figure() and subplot() that I don't think were helping you.

Ryan

On Tue, Sep 26, 2017 at 3:04 PM, William Ray Wing <wrw at mac.com> wrote:

Below is a simplified version of a much more elaborate analysis code,
but it will illustrate the problem I?m having. What I want to do is
repetitively call an analysis function from my main code and plot the
results of that analysis (a curve fit, although thats immaterial here)
while in that function. Back in the main code, I want to plot the results
of all the curve fits on a single plot. They share a common x axis, but
appear at different points along it. What seems to be happening is that
the gets set in the function, and doesn?t get set back in the main code.

Note that there are two versions of the ?problem? function, problem and
problem_alt. If you change the main code (move the #), you get the plot I
want at the end of the main.

There must be something I can call or set to recover the settings
associated with figure(2), but I can?t seem to figure it out. Any help
would be appreciated.

Thanks,
Bill Wing

#! /usr/bin/env python
# -*- coding: utf-8 -*-
#
# A simple skeleton of the program to work out the plotting problem
#
import numpy as np, matplotlib.pyplot as plt
#
# skeleton subroutines
#

def problem(xdata, ydata, i):
color_dic = {1: "red", 2: "green", 3: "blue", 4: "cyan"}
plt.figure(1)
fig1, ax1 = plt.subplots()
plt.subplot()
plt.plot(xdata, ydata, linestyle = '-', color = color_dic[i])
plt.savefig('Plot for run_num ' + str(i))
return

def problem_alt(xdata, ydata, i):
return

t = np.arange(0.0, 2.0, 0.01)
plt.figure(2)
fig2, ax2 = plt.subplots()

for i in range(0,4):
i = i+1
problem(t, np.sin(i*np.pi*3*t), i)
problem_alt(t, np.sin(i*np.pi*3*t), i)
ax2.set_xlim(xmin = 0.0, xmax = 20.0)
plt.subplot()
plt.plot((t+i*3), np.sin(i*np.pi*3*(t+i*3)))

plt.savefig("Global Plot")

_______________________________________________
Matplotlib-users mailing list
Matplotlib-users at python.org
https://mail.python.org/mailman/listinfo/matplotlib-users

--
Ryan May

_______________________________________________
Matplotlib-users mailing list
Matplotlib-users at python.org
https://mail.python.org/mailman/listinfo/matplotlib-users

_______________________________________________
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Matplotlib-users at python.org
https://mail.python.org/mailman/listinfo/matplotlib-users

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Bill,

Where on the matplotlib website would you have expected to find this information?

Tom, I?m not ignoring your question. My frustration with solving the problem I was having leads me to think this is actually an issue worth some real thought. When I have something I think might be constructive, I will follow up.
Thanks,
Bill

Asking not to be passive aggressive, but so we can update the docs to put this information there so the next person can find it Tom

You might want to check out my Anatomy of Matplotlib tutorial: https://github.com/matplotlib/AnatomyOfMatplotlib

You can use the Jupyter notebooks and follow along with the recordings available on YouTube: https://www.youtube.com/watch?v=rARMKS8jE9g (Scipy 2017) and https://www.youtube.com/watch?v=MKucn8NtVeI (Scipy 2015 - which covered more, but spent less time on each aspect).

There is also a book, "Mastering Matplotlib", which goes into deep depths with respect to the API and logic behind the library: https://www.amazon.com/Mastering-matplotlib-Duncan-M-McGreggor/dp/1783987545

Thanks, that book may be just what I?ve been searching for. I?ll check it out.
Bill

I hope that helps!
Ben Root

William,

Don't use plt to call all of the methods, but directly use them off of the Figure (e.g. fig1) and Axes (e.g. ax1) instances you create:

Thanks, that did it. Very grateful.

Parenthetically, I wish there were a matplotlib book that explained the underlying logic of mil plotting. Every one I?ve looked into so far is full of specific cookbook examples, but they don?t explain what the various calls really do, what order they need to be called in (and why), and how they affect each other. Cookbooks are fine for doing things by rote, but they don?t provide understanding. If anyone on this list knows of such a book, I?d really appreciate hearing.

Thanks,
Bill

import numpy as np, matplotlib.pyplot as plt

def problem(xdata, ydata, i):
color_dic = {1: "red", 2: "green", 3: "blue", 4: "cyan"}
fig1, ax1 = plt.subplots()
ax1.plot(xdata, ydata, linestyle = '-', color = color_dic[i])
fig1.savefig('Plot for run_num ' + str(i))
return

def problem_alt(xdata, ydata, i):
return

t = np.arange(0.0, 2.0, 0.01)
fig2, ax2 = plt.subplots()

for i in range(0,4):
i = i+1
problem(t, np.sin(i*np.pi*3*t), i)
problem_alt(t, np.sin(i*np.pi*3*t), i)
ax2.set_xlim(xmin = 0.0, xmax = 20.0)
ax2.plot((t+i*3), np.sin(i*np.pi*3*(t+i*3)))

fig2.savefig("Global Plot")

At least, I think that's what you're going for. Note I removed some extra calls to figure() and subplot() that I don't think were helping you.

Ryan

Below is a simplified version of a much more elaborate analysis code, but it will illustrate the problem I?m having. What I want to do is repetitively call an analysis function from my main code and plot the results of that analysis (a curve fit, although thats immaterial here) while in that function. Back in the main code, I want to plot the results of all the curve fits on a single plot. They share a common x axis, but appear at different points along it. What seems to be happening is that the gets set in the function, and doesn?t get set back in the main code.

Note that there are two versions of the ?problem? function, problem and problem_alt. If you change the main code (move the #), you get the plot I want at the end of the main.

There must be something I can call or set to recover the settings associated with figure(2), but I can?t seem to figure it out. Any help would be appreciated.

Thanks,
Bill Wing

#! /usr/bin/env python
# -*- coding: utf-8 -*-
#
# A simple skeleton of the program to work out the plotting problem
#
import numpy as np, matplotlib.pyplot as plt
#
# skeleton subroutines
#

def problem(xdata, ydata, i):
color_dic = {1: "red", 2: "green", 3: "blue", 4: "cyan"}
plt.figure(1)
fig1, ax1 = plt.subplots()
plt.subplot()
plt.plot(xdata, ydata, linestyle = '-', color = color_dic[i])
plt.savefig('Plot for run_num ' + str(i))
return

def problem_alt(xdata, ydata, i):
return

t = np.arange(0.0, 2.0, 0.01)
plt.figure(2)
fig2, ax2 = plt.subplots()

for i in range(0,4):
i = i+1
problem(t, np.sin(i*np.pi*3*t), i)
problem_alt(t, np.sin(i*np.pi*3*t), i)
ax2.set_xlim(xmin = 0.0, xmax = 20.0)
plt.subplot()
plt.plot((t+i*3), np.sin(i*np.pi*3*(t+i*3)))

plt.savefig("Global Plot")

_______________________________________________
Matplotlib-users mailing list
Matplotlib-users at python.org
https://mail.python.org/mailman/listinfo/matplotlib-users

--
Ryan May

_______________________________________________
Matplotlib-users mailing list
Matplotlib-users at python.org
https://mail.python.org/mailman/listinfo/matplotlib-users

_______________________________________________
Matplotlib-users mailing list
Matplotlib-users at python.org
https://mail.python.org/mailman/listinfo/matplotlib-users

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···

On Sep 27, 2017, at 12:23 PM, Thomas Caswell <tcaswell at gmail.com> wrote:
On Wed, Sep 27, 2017 at 8:23 AM William Ray Wing <wrw at mac.com> wrote:

On Sep 27, 2017, at 9:44 AM, Benjamin Root <ben.v.root at gmail.com> wrote:

On Wed, Sep 27, 2017 at 8:37 AM, William Ray Wing <wrw at mac.com> wrote:

On Sep 26, 2017, at 6:20 PM, Ryan May <rmay31 at gmail.com> wrote:

On Tue, Sep 26, 2017 at 3:04 PM, William Ray Wing <wrw at mac.com> wrote: