Hi

I have been trying to plot a matrix and want to start from top left

corner. I tried to use 'matshow' and it worked the way I wanted but

that could not satisfy other needs like I needed to plot something

else over the matrix and also needed shading='faceted' which I could

not set using matshow

So I tried to use 'pcolor' where shading is faceted by default and I

could plot other stuff on top ofI the matrix image but I could not get

the origin='upper' working with pcolor. I also tried with imshow but

it did the same thing.

I tried both lower and upper values and results come out same the

array starts plotting from bottom left.

I am using 0.87.6 and python 2.4.3

Has anybody seen this problem ? Is there usage error?

Khem Raj wrote:

Hi

I have been trying to plot a matrix and want to start from top left

corner. I tried to use 'matshow' and it worked the way I wanted but

that could not satisfy other needs like I needed to plot something

else over the matrix and also needed shading='faceted' which I could

not set using matshow

matshow calls imshow.

You should be able to plot on top of an image made by matshow or imshow, so I don't know what the problem was with that.

So I tried to use 'pcolor' where shading is faceted by default and I

could plot other stuff on top ofI the matrix image but I could not get

the origin='upper' working with pcolor. I also tried with imshow but

it did the same thing.

pcolor does not have an 'origin' kwarg but imshow does, so I don't understand your last sentence above.

For pcolor you need to either rearrange your matrix (e.g., 'pcolor(flipud(Z))') or call pcolor with X and Y arguments as well as Z.

Eric