Great, matshow() works for my requirements. Although, I must comment that its placement of tickbars seems inappropriate for a matrix visualisation. For example, for the following simple example:
import pylab matrix = pylab.array([[1,2,3],[4,5,6],[1,1,4]]) pylab.matshow(matrix, cmap=pylab.cm.gray) pylab.show() tick marks and labels are produced for [0.5,1.5,2.5] in addition to the appropriate integral ones. It's obviously not an issue for larger matrices. Further, I would think a setting like align='center' in pylab.bar() would be appropriate. Any simple way of doing this without manually setting the ticks and labels (ironically using forced *.5 ticks)? I guess I should code and submit it myself. :) Thanks very much, Suresh On Thu, 1 Mar 2007, Eric Firing wrote: > Suresh Pillai wrote: >> I am using imshow to visualise matrices. When I use align='upper' >> (default), the origin is still displayed in the lower left corner on the >> axes - i.e. the y-axis is wrong. The data is plotted correctly with the >> origin in the upper left corner. >> >> Seems to be a bug? > > No, this is just the way it was designed and has always been. You can use > the "extent" kwarg to control the axes: > > * origin is either upper or lower, which indicates where the [0,0] > index of the array is in the upper left or lower left corner of > the axes. If None, default to rc image.origin > * extent is a data xmin, xmax, ymin, ymax for making image plots > registered with data plots. Default is the image dimensions > in pixels > > See the code in axes.spy() for an example of how to get what you want using > imshow and the extent kwarg; or use pylab.matshow instead of pylab.imshow. > (Probably there should be an axes.matshow convenience method, with > pylab.matshow as a wrapper that autogenerates a figure if needed. But at the > moment there isn't.) > > Eric > >> >> Cheers, >> Suresh >> >> ------------------------------------------------------------------------- >> Take Surveys. Earn Cash. Influence the Future of IT >> Join SourceForge.net's Techsay panel and you'll get the chance to share >> your >> opinions on IT & business topics through brief surveys-and earn cash >> http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV >> _______________________________________________ >> Matplotlib-users mailing list >> Matplotlib-users@lists.sourceforge.net >> https://lists.sourceforge.net/lists/listinfo/matplotlib-users > > > ------------------------------------------------------------------------- Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT & business topics through brief surveys-and earn cash http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV _______________________________________________ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
