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problem with matrix selection

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Rica
Rica 2012-11-12
Hi i want to clear some data from a matrix a of size 10*20. i have the index of data to clear. for a vector b we do it lik this: b(index)=[]
how to do it for matrix?

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Thomas
Thomas 2012-11-12
编辑：Thomas 2012-11-12
You will have to clear a row or a column completely
to remove row
a=[1 2 3;4 5 6; 7 8 9]
a(2,:)=[] % remove 2nd row
to remove column
a=[1 2 3;4 5 6; 7 8 9]
a(:,2)=[] % remove 2nd column
otherwise you need to convert them to NaN if removing individually
a=[1 2 3;4 5 6; 7 8 9]
a(2,2)=NaN % convert 2nd row 2nd col to NaN

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