Thanks for the hints. This one is getting close to what I need, except I
have a scale at the top and the bottom:
from mpl_toolkits.axes_grid1 import host_subplot
import mpl_toolkits.axisartist as AA
import matplotlib.pyplot as plt
def fahrenheit2celsius(temp):
"""
Returns temperature in Celsius.
"""
return temp * 2 / 9
def convert_ax_c_to_celsius(ax_f):
"""
Update second axis according with first axis.
"""
y1, y2 = ax_f.get_xlim()
par2.set_xlim(fahrenheit2celsius(y1), fahrenheit2celsius(y2))
par2.figure.canvas.draw()
if 1:
host = host_subplot(111, axes_class=AA.Axes)
plt.subplots_adjust(bottom=0.25)
# par1 = host.twinx()
par2 = host.twiny()
host.callbacks.connect("xlim_changed", convert_ax_c_to_celsius)
offset = -45
new_fixed_axis = par2.get_grid_helper().new_fixed_axis
par2.axis["bottom"] = new_fixed_axis(loc="bottom",
axes=par2,
offset=(0, offset))
par2.axis["bottom"].toggle(all=True)
host.set_xlim(0, 2)
host.set_ylim(0, 2)
host.set_xlabel("Distance")
host.set_ylabel("Density")
# par1.set_ylabel("Temperature")
par2.set_xlabel("Velocity")
p1, = host.plot([0, 1, 2], [0, 1, 2], label="Density")
# p2, = par1.plot([0, 1, 2], [0, 3, 2], label="Temperature")
#p3, = par2.plot([0, 1, 2], [50, 30, 15], label="Velocity")
# par1.set_ylim(0, 4)
#par2.set_ylim(1, 65)
host.legend()
# host.axis["left"].label.set_color(p1.get_color())
# par1.axis["right"].label.set_color(p2.get_color())
# par2.axis["right"].label.set_color(p3.get_color())
plt.draw()
plt.show()
···
On Thu, Jan 14, 2016 at 9:54 AM, Benjamin Root <ben.v.root at gmail.com> wrote:
What did you do for the new_fixed_axis portion of the code? That is the
key part. If the location isn't set correctly there, the direction will be
incorrect.
Ben Root
On Thu, Jan 14, 2016 at 9:50 AM, Neal Becker <ndbecker2 at gmail.com> wrote:
Thanks, but I want 2 scales on the bottom. The scale produced by twiny
seems to go on the top. While I can fix the position with
ax_c = ax_f.twiny()
fig.subplots_adjust(bottom=0.2)
ax_c.spines["top"].set_position(("axes", -0.2))
that will leave me with x-axis label and tick marks going the wrong way
for the bottom
On Thu, Jan 14, 2016 at 9:43 AM, Benjamin Root <ben.v.root at gmail.com> >> wrote:
Just do a parasite axis using axisartist. This example does have two
plots, but you don't have to do the first one:
http://matplotlib.org/examples/axes_grid/demo_parasite_axes2.html
Cheers!
Ben Root
On Thu, Jan 14, 2016 at 8:15 AM, Neal Becker <ndbecker2 at gmail.com> >>> wrote:
I'm trying to make a plot which has 2 scales (linearly related), but
just 1
set of data. I've seen many examples with 2 plots and 2 scales, but
that's
not what I need here.
I blindly followed some examples and was able to make a pretty good plot
with one scale on bottom and one on top. I'd like to see how it looks
with
2 scales on the bottom, with an offset between them, but I don't know
how to
do it.
Attached is the current version.
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