imshow() with a colorbar?

Community matplotlib-users
#1

Hi,

I am trying to add a (configurable) colorbar to a an array which I simply plot with imshow().

Could anyone please help me how to enhance it with a colorbar?

import scipy,pylab
import matplotlib.cm as cm # colormaps

import matplotlib.colors as col # colormaps

dat = scipy.array([[1,2,3,4],[5,6,7,8]])

fig = pylab.figure()
ax = pylab.gca()
ax.set_title(‘the title’)

here’s chaos :slight_smile:

#cmap = cm.get_cmap(‘rainbow’, 20) # 10 discrete colors

#ax.imshow(dat, cmap=cmap, interpolation=‘nearest’)
#fig.colorbar(dat)
#min,max = dat.min(),dat.max()

ax.imshow(dat,interpolation=‘nearest’)
pylab.show()

Thanks a lot in advance,

Daniel

#2

Hi,

I am trying to add a (configurable) colorbar to a an array which I
simply plot with imshow().

Could anyone please help me how to enhance it with a colorbar?

Check out the gallery; several examples there use a colorbar. http://matplotlib.sourceforge.net/gallery.html

Then look for relevant sections in the docs, such as
http://matplotlib.sourceforge.net/users/image_tutorial.html
http://matplotlib.sourceforge.net/api/pyplot_api.html#matplotlib.pyplot.colorbar
etc.

Eric

···

On 02/07/2011 10:48 AM, Daniel Mader wrote:

import scipy,pylab
import matplotlib.cm <http://matplotlib.cm> as cm # colormaps
import matplotlib.colors as col # colormaps

dat = scipy.array([[1,2,3,4],[5,6,7,8]])

fig = pylab.figure()
ax = pylab.gca()
ax.set_title('the title')

## here's chaos :slight_smile:
#cmap = cm.get_cmap('rainbow', 20) # 10 discrete colors
#ax.imshow(dat, cmap=cmap, interpolation='nearest')
#fig.colorbar(dat)
#min,max = dat.min(),dat.max()

ax.imshow(dat,interpolation='nearest')
pylab.show()

Thanks a lot in advance,
Daniel

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#3

Thanks a lot Thomas,

besides that it should be

fig.colorbar(im)
instead of
ax.colorbar(im)

the example works great!

Best regards,
Daniel

2011/2/7 Eric Firing

···

On 02/07/2011 10:48 AM, Daniel Mader wrote:

Hi,

I am trying to add a (configurable) colorbar to a an array which I

simply plot with imshow().

Could anyone please help me how to enhance it with a colorbar?

Check out the gallery; several examples there use a colorbar.

http://matplotlib.sourceforge.net/gallery.html

Then look for relevant sections in the docs, such as

http://matplotlib.sourceforge.net/users/image_tutorial.html

http://matplotlib.sourceforge.net/api/pyplot_api.html#matplotlib.pyplot.colorbar

etc.

Eric

import scipy,pylab

import matplotlib.cm <http://matplotlib.cm> as cm # colormaps
import matplotlib.colors as col # colormaps

dat = scipy.array([[1,2,3,4],[5,6,7,8]])

fig = pylab.figure()

ax = pylab.gca()

ax.set_title(‘the title’)

here’s chaos :slight_smile:

#cmap = cm.get_cmap(‘rainbow’, 20) # 10 discrete colors

#ax.imshow(dat, cmap=cmap, interpolation=‘nearest’)

#fig.colorbar(dat)

#min,max = dat.min(),dat.max()

ax.imshow(dat,interpolation=‘nearest’)

pylab.show()

Thanks a lot in advance,

Daniel