imagesc aspect ratio

[Stephen Isard]

Hello,

I have just compiled octave 3.81 for myself after using the 3.4 version 
distributed with my linux distribution for some years.  The behaviour 
of the imagesc function seems to have changed, although the help file 
hasn't.  I wonder whether this is intentional or a bug.

In 3.4 the code
imagesc([1:3]*0.01,[1:3],zeros(3)); colormap(gray);
produces a nearly square black rectangle with the x axis labelled from
0.005 to 0.035.  In 3.81 it produces a vertical line with x axis labels 
printed on top of each other at the bottom.  A subsequent call to
asp=daspect()
gives [1.0000 100.0000 33.3333] in 3.4, but [1 1 1] in 3.81.  Calling 
daspect with the values from 3.4 in 3.8 gets the nearly square plot.

I found the old behaviour more helpful.  In particular the speech 
spectrogram example in the help file for the specgram function from the 
signal package no longer works.  You just get a vertical line.  You have 
to set the aspect ratio by hand to see a display.

Stephen Isard