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PLOT 2D graph and matrices

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Lewis Fer
Lewis Fer on 18 Jun 2021
Commented: Lewis Fer on 18 Jun 2021
I'm trying to solve this 2D problem in matlab,
for a given matrices (2*2 dimension for example) using the following notations :
A frequency-domain representation of the matrix K
sigma=the maximum singular value of matrix K;
the fist axis is p and the secon axis is s where 1<p<4 and 1<s<4 and
K=[p-1 -2; -3 s-4]
how to ( compute and plot ) the surf that represnt each pair (p,s) the ( sigma=the maximum singular value of matrix K) like this graph ( note that this graph is for a nother example ),
it's mean: the first axis: p, the second axis: s, and the third axis: we have the maximum singular value of matrix K

Accepted Answer

SALAH ALRABEEI
SALAH ALRABEEI on 18 Jun 2021
You need to define several values of p and s, then find the svds of K for each value of k p and s; See thebexample below
p=1.1:0.1:3.9;
s=p
for i =1:length(p)
for j =1: length(s)
pi = p(i); sj = s(j);
K=[pi-1 -2; -3 sj-4];
M(i,j) = svds(K,1);
end
end
surf(p,s,M)
  1 Comment
Lewis Fer
Lewis Fer on 18 Jun 2021
thank you so much SALAH!! this is the result I I forgot to use svds command.

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