imagesc questions

[Debian]

Hello.
I would like to run the following in octave,

T=initial_value( size_of_T );
while ( this_is_fun )
    T=new_value(T);
    imagesc(T);
endwhile.

Now imagesc would be fairly ok on a small size of T (the calculations would be 
quick) but the problem in octave 2.1.64 in Linux is that I get a very bad 
plotting with imagemagic (that seems to be used). 
If T has the size 400x400, I get a small image, 96x96 pixels that shows T, I 
also get a window showing a part of the image, enlarged.
Questions:

1) Can I get ONE large (700x700 pixels? or anything I see fit) window showing 
the plotted image?

2) Can I get imagesc to plot all images in the same window all the time? That 
would make it easier to see how T evolves over time. (And I wouldn't have to 
close 5000 windows....)

Gunnar.



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