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How can i change values in matrix in random fashion?

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DEEPAK Chekuri
DEEPAK Chekuri 2020-12-4
评论： Cris LaPierre 2020-12-4
i have this matrix
p=[1 -1 -1 -1 -1 1 -1;
1 1 1 -1 -1 1 -1]
how can i randomly change the values at any two positions in this matrix.
note : random numbers are to be either 1 or -1

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Cris LaPierre
Cris LaPierre 2020-12-4
I'd use numel, and randi to identify 2 random points, and then, using linear indexing, multipy those 2 points by -1.
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Steven Lord
Steven Lord 2020-12-4
You probably want randperm not randi so you don't swap a point with itself. You don't want to reverse the polarity of the neutron flow if it's already had its polarity reversed; that would confuse the polarity!

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