imagesc

[pathematica]

octave 3.23/ubuntu 10.04 

I would be grateful if someone could explain how to use imagesc(). If it is
clear to someone who knows how to use it that I do not have the necessary
insight and remedial education is not a practical option in this forum,
please do not be afraid to say so in this forum - I will not be offended! 

I was hoping (I might have misunderstood) that it allows scaling of images
so that a suitable sized raster image might be plotted for rendering in a
browser. 

Following the instructions in the manual, I have installed xloadimage (into
ubuntu) using the Synaptic Package Manager. 

% the following is just a random plot (not important) to illustrate the
point 
tx = ty = linspace (0, 3, 31)'; 
[xx, yy] = meshgrid (tx, ty); 
tz = exp(-xx); 
mesh (tx, ty, tz); 
box("off"); hold("on"); 
% end of plot 

% then, intending to scale by 0.5, I have tried the following (I am
embarrassed to admit I am not sure how to interpret the 'x' given in the
manual): 

imagesc(x, 0.5); 

% with the hope of printing a scaled png image with eg 
print -dpng filename.png 

This yields the following error messages 
error: `x' undefined near line () column () 
error: evaluating argument list element number 1 
error: evaluating argument list element number 1 

I apologise if my reading of the function is naive and this looks stupid!
Still, I have no pride and I will not be offended if someone merely lets me
know that I do not have the necessary skills or insight to use the function
:-) 


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