plot dict

Community matplotlib-users
1

Hi,
X and Y values are stored in a dict whereas X is the key and Y is the value in the following code:

import matplotlib.pyplot as plt

data = {4: 3, 5: 4, 6: 5, 7: 4, 8: 5}

print data
for i in sorted(data.keys()):
     print i

How is possible to use plot with a dict in order to get a similar picture like this http://matplotlib.sourceforge.net/_images/invert_axes.png .

Thank you in advance.

2

In this case, you should be able to use:

plt.plot(data.items())

Mike

···

On 03/29/2011 09:08 AM, xyz wrote:

Hi,
X and Y values are stored in a dict whereas X is the key and Y is the
value in the following code:

import matplotlib.pyplot as plt

data = {4: 3, 5: 4, 6: 5, 7: 4, 8: 5}

print data
for i in sorted(data.keys()):
      print i

How is possible to use plot with a dict in order to get a similar
picture like this
http://matplotlib.sourceforge.net/_images/invert_axes.png .

Thank you in advance.

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Michael Droettboom
Science Software Branch
Space Telescope Science Institute
Baltimore, Maryland, USA

3

Michael Droettboom, on 2011-03-29 10:12, wrote:

> Hi,
> X and Y values are stored in a dict whereas X is the key and Y is the
> value in the following code:
>
> import matplotlib.pyplot as plt
>
> data = {4: 3, 5: 4, 6: 5, 7: 4, 8: 5}
>
> print data
> for i in sorted(data.keys()):
> print i
>
> How is possible to use plot with a dict in order to get a similar
> picture like this
> http://matplotlib.sourceforge.net/_images/invert_axes.png .
In this case, you should be able to use:

plt.plot(data.items())

For me, that line produces two lines with the abscissa going from
0 to 4. In other words, plt.plot(data.items()) ends up being
equivalent to plt.plot(data.values());plt.plot(data.keys())

I think what xyz wants is this:

x,y = zip(*sorted(data.items()))
plt.plot(x,y)

I think of the * in front of arguments to zip as being the pull
tab or slider of the zipper (since it's at the top, you'll be
pulling it down, or unzipping): see

best,

···

On 03/29/2011 09:08 AM, xyz wrote:

--
Paul Ivanov
314 address only used for lists, off-list direct email at:
http://pirsquared.org | GPG/PGP key id: 0x0F3E28F7

4

Thank you it works.

···

On 03/30/2011 05:01 AM, Paul Ivanov wrote:

Michael Droettboom, on 2011-03-29 10:12, wrote:

On 03/29/2011 09:08 AM, xyz wrote:

Hi,
X and Y values are stored in a dict whereas X is the key and Y is the
value in the following code:

import matplotlib.pyplot as plt

data = {4: 3, 5: 4, 6: 5, 7: 4, 8: 5}

print data
for i in sorted(data.keys()):
       print i

How is possible to use plot with a dict in order to get a similar
picture like this
http://matplotlib.sourceforge.net/_images/invert_axes.png .

In this case, you should be able to use:

plt.plot(data.items())

For me, that line produces two lines with the abscissa going from
0 to 4. In other words, plt.plot(data.items()) ends up being
equivalent to plt.plot(data.values());plt.plot(data.keys())

I think what xyz wants is this:

x,y = zip(*sorted(data.items()))
plt.plot(x,y)

I think of the * in front of arguments to zip as being the pull
tab or slider of the zipper (since it's at the top, you'll be
pulling it down, or unzipping): see
Built-in Functions — Python 3.12.0 documentation

best,