Hi Rado,
Yes, sliders work better. I can then limit the range of the entries
in the matrix, thereby bounding the magnitude of the output, thereby
bounding the size of the plot, thereby letting me fix its size at the
maximum possible, thereby suppressing a rescaling of the graphic on
each change
I think if the interact looks like the pictures in
http://www.ams.org/featurecolumn/archive/svd.html it would be
snazzier.
Also haven't played much with Sage interact so not sure if it is
possible, but wouldn't having 4 sliders (one for each entry) be easier
if someone really tries to find the
