Removing rows based on numerical value

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Dave
Dave 2016-5-15
编辑： dpb 2016-5-16
I would like to remove rows from a very large array based on a column that increments from 0.00 by tenths or hundreths to very large numbers. I only want to keep the rows that have zeros in the decimal places. I'm just not sure what MATLAB function / technique to use to pull only those rows.

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回答（1 个）

dpb
dpb 2016-5-15
编辑：dpb 2016-5-16
Presuming "...only want to keep the rows that have zeros in the decimal places" means the integer-valued locations, then lose those not matching--
x(mod(x(:,nCol),1)~=0),:)=[];
or, conversely, keep the wanted--
x=x(mod(x(:,nCol),1)==0),:);
where nCol is the column of interest in array x
Not sure if either has any speed advantage for larger arrays or not...

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