[Matplotlib-users] Adding a colorbar --- how?
There are some rather nice and useful matplotlib examples for colormaps that are shown at: http://nbviewer.ipython.org/github/dpsanders/matplotlib-examples/blob/master/colorline.ipynb In*Example 1. Sine wave colored by time (uses the defaults for colorline)*, how can one add a colorbar? --V -- HPCC Systems Open Source Big Data Platform from LexisNexis Risk Solutions Find What Matters Most in Your Big Data with HPCC Systems Open Source. Fast. Scalable. Simple. Ideal for Dirty Data. Leverages Graph Analysis for Fast Processing Easy Data Exploration http://p.sf.net/sfu/hpccsystems___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
Re: [Matplotlib-users] Adding a colorbar --- how?
Hi Virgil, I did something very much like this recently by simply adding an axes to my figure and using it to show a linspace of the data range off which the line color was based. See http://matplotlib.org/examples/color/colormaps_reference.html. Best, Ray On Sun, Jun 15, 2014 at 6:17 PM, Virgil Stokes v...@it.uu.se wrote: There are some rather nice and useful matplotlib examples for colormaps that are shown at: http://nbviewer.ipython.org/github/dpsanders/matplotlib-examples/blob/master/colorline.ipynb In* Example 1. Sine wave colored by time (uses the defaults for colorline)*, how can one add a colorbar? --V -- HPCC Systems Open Source Big Data Platform from LexisNexis Risk Solutions Find What Matters Most in Your Big Data with HPCC Systems Open Source. Fast. Scalable. Simple. Ideal for Dirty Data. Leverages Graph Analysis for Fast Processing Easy Data Exploration http://p.sf.net/sfu/hpccsystems ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users -- HPCC Systems Open Source Big Data Platform from LexisNexis Risk Solutions Find What Matters Most in Your Big Data with HPCC Systems Open Source. Fast. Scalable. Simple. Ideal for Dirty Data. Leverages Graph Analysis for Fast Processing Easy Data Exploration http://p.sf.net/sfu/hpccsystems___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
Re: [Matplotlib-users] Adding a colorbar --- how?
On 2014/06/15, 12:17 PM, Virgil Stokes wrote: There are some rather nice and useful matplotlib examples for colormaps that are shown at: http://nbviewer.ipython.org/github/dpsanders/matplotlib-examples/blob/master/colorline.ipynb In*Example 1. Sine wave colored by time (uses the defaults for colorline)*, how can one add a colorbar? lc = colorline(x, y) cbar = fig.colorbar(lc) Eric --V -- HPCC Systems Open Source Big Data Platform from LexisNexis Risk Solutions Find What Matters Most in Your Big Data with HPCC Systems Open Source. Fast. Scalable. Simple. Ideal for Dirty Data. Leverages Graph Analysis for Fast Processing Easy Data Exploration http://p.sf.net/sfu/hpccsystems ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users -- HPCC Systems Open Source Big Data Platform from LexisNexis Risk Solutions Find What Matters Most in Your Big Data with HPCC Systems Open Source. Fast. Scalable. Simple. Ideal for Dirty Data. Leverages Graph Analysis for Fast Processing Easy Data Exploration http://p.sf.net/sfu/hpccsystems ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
Re: [Matplotlib-users] Adding a colorbar --- how?
On 16-Jun-14 00:46, Raymond Smith wrote:
Hi Virgil,
I did something very much like this recently by simply adding an axes
to my figure and using it to show a linspace of the data range off
which the line color was based. See
http://matplotlib.org/examples/color/colormaps_reference.html.
Best,
Ray
On Sun, Jun 15, 2014 at 6:17 PM, Virgil Stokes v...@it.uu.se
mailto:v...@it.uu.se wrote:
There are some rather nice and useful matplotlib examples for
colormaps that are shown at:
http://nbviewer.ipython.org/github/dpsanders/matplotlib-examples/blob/master/colorline.ipynb
In*Example 1. Sine wave colored by time (uses the defaults for
colorline)*, how can one add a colorbar?
--V
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Thanks for your response to my request, Ray. I had looked at this
approach earlier; but, what I really need is something like is produced
by the following code for the cax object:
Produce custom labelling for a colorbar.
Original Script: Scott Sinclair
Modification: V. Stokes
import matplotlib.pyplot as plt
import numpy as np
import matplotlib.colors as col
from matplotlib import cm
from numpy.random import randn
def register_cmap():
Purpose: define colormap using the from_List() method as a
segmented list and register it.
cmap_Name = 'reyegr'# my colormap name
startcolor = '#00AF33' # truegreen
midcolor = '#FFE600' # yolk (a medium dark yellow)
endcolor = '#FF0033' # bright red
cmap2 = col.LinearSegmentedColormap.from_list(cmap_Name,
[startcolor,midcolor,endcolor])
cm.register_cmap(cmap=cmap2)
return cm.get_cmap(cmap_Name) # my new cmap for 'reylgr'
#-
my_cmap = register_cmap()
## Vertical colorbar-1
fig, ax = plt.subplots()
data = np.clip(randn(250, 250), -1, 1)
cax = ax.imshow(data, interpolation='nearest', cmap=my_cmap)
ax.set_title('Gaussian noise with vertical colorbar')
# Add colorbar, make sure to specify tick locations to match desired
ticklabels
cbar = fig.colorbar(cax, ticks=[-1, 0, 1])
cbar.ax.set_yticklabels(['-1', '0', ' 1'])# vertically oriented colorbar
## Vertical colorbar-2
fig, ax = plt.subplots()
data = np.clip(randn(50, 50), -1, 1)
#cax = ax.imshow(data, interpolation='nearest', cmap=cm.coolwarm)
cax = ax.imshow(data, interpolation='nearest', cmap=my_cmap)
ax.set_title('Gaussian noise with vertical colorbar')
# Add colorbar, make sure to specify tick locations to match desired
ticklabels
cbar = fig.colorbar(cax, ticks=[-1, 0, 1])
# Vertically oriented (by default) colorbar
cbar.ax.set_yticklabels(['Low', 'Medium', 'High'])
## Horizontal colorbar
fig, ax = plt.subplots()
#
cax = ax.imshow(data, interpolation='nearest', cmap=my_cmap)
ax.set_title('Gaussian noise with horizontal colorbar')
cbar = fig.colorbar(cax, ticks=[-1, 0, 1], orientation='horizontal')
cbar.ax.set_xticklabels(['Low', 'Medium', 'High'])# horizontal colorbar
plt.show()
But, for a colorline object, which was referenced in the link given in
my earlier email.
--V
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Re: [Matplotlib-users] Adding a colorbar --- how?
On 16-Jun-14 01:12, Eric Firing wrote: On 2014/06/15, 12:17 PM, Virgil Stokes wrote: There are some rather nice and useful matplotlib examples for colormaps that are shown at: http://nbviewer.ipython.org/github/dpsanders/matplotlib-examples/blob/master/colorline.ipynb In*Example 1. Sine wave colored by time (uses the defaults for colorline)*, how can one add a colorbar? lc = colorline(x, y) cbar = fig.colorbar(lc) Eric This works fine --- thanks very much Eric. Have a good day -- HPCC Systems Open Source Big Data Platform from LexisNexis Risk Solutions Find What Matters Most in Your Big Data with HPCC Systems Open Source. Fast. Scalable. Simple. Ideal for Dirty Data. Leverages Graph Analysis for Fast Processing Easy Data Exploration http://p.sf.net/sfu/hpccsystems ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
