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From: Elisa Bulla on 2 Jul 2010 07:41
Hi, I am italian...sorry my English language ;)
I have a transfer function G (s) = 3b / ((s ^ 2 +2 * s +3) (s +1) (s ^ 2 + s + a * b)) with 0<a<200 and 0<b<200
I must calculate the singular values and then I must set s=sigma1-sigma2+sigma3-sigma4+sigma5. I must use the command "imagesc" to graph results.

My problem is using this command imagesc..I don't knows how to do...help me please.
From: darthshak on 2 Jul 2010 04:04
> Hi, I am italian...sorry my English language ;)
> I have a transfer function G (s) = 3b / ((s ^ 2 +2 *
> s +3) (s +1) (s ^ 2 + s + a * b)) with 0<a<200 and
> 0<b<200
> I must calculate the singular values and then I must
> set s=sigma1-sigma2+sigma3-sigma4+sigma5. I must use
> the command "imagesc" to graph results.
>

What are sigma1...sigma5? Could you be more specific?

> My problem is using this command imagesc..I don't
> knows how to do...help me please.

The command "doc imagesc" (without the quotes) will give you information on using the imagesc command.

Roughly, if you have a matrix X, with the X-axis data varying from x0 to x1 (x0 < x1) and Y-axis data varying from y0 to y1 (y0 < y1), you could try to execute the following :
imagesc( X,'Xdata', linspace(x0,x1,size(X,2)), 'YData', linspace(y0,y1,size(X,1)) )

Hope that helps
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