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How to index a random matrix with set conditions?

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How can I find elements within a random matrix M (5x5) that are negative or are between 20 and 40?

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Are Mjaavatten
Are Mjaavatten 14 Jan 2019
For a list of the negative values:
negM = M(M<0)
For the indices of the negative values:
[i,j] = find(M<0)
To display only the negative values in a matrix:
N = M;
N(N>=0) = 0
For values between 20 and 40
values = M(M>=20 & M<=40)

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