How to efficiently delete rows from very large matrix

I have to delete rows from a very large matrix (in order of 2 000 000x30). I am currently using the following code the code does this very slowly. Currently going through one matrix takes a couple of hours.

[n,m] = size(data);

%%% nan check

data_nan_checked =zeros(1,m);

ok_row_count = 0;

for i = 1:n

nan_found = 0;

for j = start_column:end_column

if isnan(data(i,j))

nan_found = 1;

end

end

if nan_found == 0 %&& row_ave > 0

ok_row_count = ok_row_count + 1;

data_nan_checked(ok_row_count,:) = data(i,:);

end

end

Answer 1

[Torsten]

data(any(isnan(data),2),:) = [];

[Sami Seppälä]

Thank you!