set some values to zero in a matrix or vector
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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!
回答（1 个）
Fangjun Jiang
2011-5-30
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.
3 个评论
Hongmei Hu
2011-5-31
Oleg Komarov
2011-5-31
That's what Fangjun's solution does. Did you try his snippet?
Fangjun Jiang
2011-5-31
@Oleg, I think she is asking if there is an easier way to do it in Simulink. The approach I suggested above in Simulink is a brutal force approach.
@Hongmei Hu, Is there a particular reason that you have to do it in Simulink? To me, SVD is best dealt with using Matlab.
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2011-5-30
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