error evaluating binary operator

[Emily Moberg]

Hi! 
I have the following for loop
[m,o]=size(A)
for n=1:o
idx=find(A(:,n)==0);
if length(idx)>=m*(.7);
A(:,n)=[];
endif;
endfor;
and I keep getting an error evaluating binary operator '=='  for the idx=find(A(:,n)==0) line. I'm not sure what I'm doing wrong... I'm still rather new at this, so sorry if this is a trivial question!

Thanks! 


Emily

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