Removing rows based on numerical value

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.

Answer 1

[dpb]

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...