how do label with matshow

Hi all,

I start using matplotlib a month ago, so I'm still learning.
I'm trying to do a heatmap with matshow. My code is the following:

data = numpy.array(a).reshape(4, 4)
cax = ax.matshow(data, interpolation='nearest', cmap=cm.get_cmap('PuBu'),
norm=LogNorm())
cbar = fig.colorbar(cax)

ax.set_xticklabels(alpha)
ax.set_yticklabels(alpha)

where alpha is a model from django with 4fields: 'ABC', 'DEF', 'GHI', 'JKL'

the thing is that I don't know why, the label 'ABC' doesn't appear, leaving the
last cell without label.
I would like to known how do I properly label my heatmap, when I use set_ticks
the figure decrease size and the colorbar stay bigger than the figure.
If someone would have a clue how to modify my script in a way to appear the
'ABC' I would be grateful :slight_smile:

Hi all,

I start using matplotlib a month ago, so I'm still learning.
I'm trying to do a heatmap with matshow. My code is the following:

data = numpy.array(a).reshape(4, 4)
cax = ax.matshow(data, interpolation='nearest', cmap=cm.get_cmap('PuBu'),
norm=LogNorm())
cbar = fig.colorbar(cax)

ax.set_xticklabels(alpha)
ax.set_yticklabels(alpha)

where alpha is a model from django with 4fields: 'ABC', 'DEF', 'GHI', 'JKL'

The problem is that ticks and ticklabels are not necessarily within the axes limits. In this case, the array of tick locations is actually [-1, 0, 1, 2, 3, 4], so what you need to do is provide labels to match those locations. Try this:

alpha = ['', 'ABC', 'DEF', 'GHI', 'JKL', '']

Eric

ยทยทยท

On 08/20/2010 12:38 AM, Patricia wrote:

the thing is that I don't know why, the label 'ABC' doesn't appear, leaving the
last cell without label.
I would like to known how do I properly label my heatmap, when I use set_ticks
the figure decrease size and the colorbar stay bigger than the figure.
If someone would have a clue how to modify my script in a way to appear the
'ABC' I would be grateful :slight_smile: