Hi, I was just comparing images displayed with imshow()
> with what I get from IRAF's display command and ds9. The
> latter puts the first axis increasing horizontally and
> the second axis increasing vertically, as if the image
> array were addressed as img[ix,iy], where ix and iy are
> integer x and y coordinates. The axes imshow() produces
> are labeled as if this is true for it as well, but in
> fact the image is upside down with respect to what I see
> with IRAF. Even odder, to see the same display I see in
> IRAF I have to do imshow(img[::-1,:]), as if I'm
> reversing the direction of the first axis.
Does changing the rc param
image.origin : upper # lower | upper
to lower help?
> I've tried to look at the source, really, but I feel like
> I'm *years* away from being enough of a Python hacker to
> understand matplotlib.
Hmm, the code's not that bad is it 
JDH
John Hunter wrote:
"Stephen" == Stephen Walton <stephen.walton@...267...> writes:
Does changing the rc param
image.origin : upper # lower | upper
to lower help?
Yes, it makes the image the right way around. I was simply confused because I expected the pixel at (x,y) in the imshow display to be the value of img[x,y]. It appears not to be. I hasten to add MATLAB's worse, as the pixel at (x,y) is actually the value of img[y,x]; MATLAB displays with the first array coordinate increasing downward and the second from left to right.
> I've tried to look at the source, really, but I feel like
> I'm *years* away from being enough of a Python hacker to
> understand matplotlib.
Hmm, the code's not that bad is it
I'm sure the code is fine, John, and it's just me. Specifically, if I want to see how matplotlib is doing something, I can't just trace function calls like I'm used to doing with Fortran and C, because there are methods too and I have to find the class which defines those methods to see what's happening. Is there anything like ctags for Python?
Steve
Robert Kern wrote:
Exuberant ctags
http://ctags.sourceforge.net/
Which, as it turns out, is the version of ctags on Fedora Core 3. I did a 'ctags -R' in the matplotlib root directory and am now happily browsing the source using nedit.
Thanks, Robert!
Steve