set some values to zero in a matrix or vector

Question

Hongmei Hu 2011-5-30

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Hi everyone,

I am doing the svd in Simulink, I got the eigenvalue, now I want to set some eigenvalues smaller than a given value to zero. for example, if the eigenvalue small than 2, i set it to zero and keep the those eigen values large than 2 unchanged, incuding the place in the matix and the value.

PS: my matlab is 2009b, there are no Find block. so I can not use that block to find the zero value also.

Thank you very much!

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Answer 1

Fangjun Jiang 2011-5-30

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在 MATLAB Online 中打开

How do you do it in Simulink? It sounds like a Matlab data processing problem, e.g.

a=4*rand(3,3)
a(a<2)=0

If you do it in Simulink, what I can think of is that you demux your matrix to individual value, and then use a switch block to compare these individual value, if it is less than 2 then output zero, otherwise, pass it through. At the end, mux them together.