[Matplotlib-users] Color bar extents

[Asma R. <asm...@gm...>]

Hi,

I am stuck at setting the color bar minimum and maximum values, according
to what I found I need to set ticks to a numpy linspace array. Here is my
code:


































* threshold=1.01        fig = plt.figure(figsize=(25,25))
plt.suptitle(file_handle.replace('.csv',''),fontsize=22)
cmap.set_over('green')    cmap.set_under('grey')    gs=gridspec.GridSpec(1,
2,height_ratios=[1,1,-2,2] ,width_ratios=[2,1,-2,2],hspace=0,wspace=0)
phyl_ax=plt.subplot(gs[0])     ht_ax=plt.subplot(gs[1])
ht_ax.set_xlim(34,0)    ht_ax.set_ylim(34,0)    cb_ax,kw
=mpl.colorbar.make_axes(ht_ax, shrink=0.65)
plt.setp(phyl_ax.get_xticklabels(),visible=False)
plt.setp(phyl_ax.get_yticklabels(),visible=False)
plt.setp(ht_ax.get_xticklabels(),visible=True)
plt.setp(ht_ax.get_yticklabels(),visible=True)
plt.setp(phyl_ax.get_xticklines(),visible=False)
plt.setp(phyl_ax.get_yticklines(),visible=False)
plt.setp(ht_ax.get_xticklines(),visible=True)
plt.setp(ht_ax.get_yticklines(),visible=True)    img =
ht_ax.imshow(data,cmap=cmap,interpolation='none',vmin=-1.0,vmax=threshold,aspect='auto')
v = np.linspace(-1.0, 1.0, 15, endpoint=True)    cb =
mpl.colorbar.ColorbarBase(ax=cb_ax,cmap=cmap,ticks=v,extend='neither',**kw)
cb.cmap.set_over('green')    img=
mpimg.imread('/home/asmariyaz/Desktop/mytree.png')
phyl_ax.imshow(img,interpolation='bilinear',aspect='auto')*

The problem that arises is that the color bar's extent always shows up from
0 to 1, though I set the ticks from -1 to 1?
I also noticed that in a dataset where I have a negative value, the color
bar still shows up as 0 to 1.

Could anyone guide me? Appreciate your help!!

Asma