Is there a function/command call that does 2-d logical
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Given for example a = rand(3,3) I want to keep only those entries in a that are greater than say 0.5. How to do this?
I've tried a(a>0.5), but it only gave the values as a vector, not the values situated on where they WERE in a.
回答（2 个）
Either you can get a vector of only the values that you want (like you were getting), or you can have a matrix by replacing the unwanted values with some value/s of your choice, e.g.:
a = rand(3,3)
a(a<=0.5) = NaN
It is not possible to have a matrix with "holes" in it. Every element of your matrix must contain a value.
madhan ravi
2018-11-13
编辑：madhan ravi
2018-11-13
a = rand(3)
logicals=a>0.5 %tells where they are located in matrix
values=a(logicals)
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