find out in which row an element is equal to a specific number

hi,

I have the following problem:

I have a matrix with 20 columns and over 200'000 rows. somewhere in this matrix there seems to be some strange datas which I would like to delete. If I am looking for the rownumbers where the value is higher than a specific value, lets say I am looking for all the values in the first row that are larger than 1500

If I do this:

data18(:,1)>1500

I get a logical array, but what I am looking for is the exact row number, what do I need to do?

Answer 1

If you are looking for rows where any value is > 1500, then

find(any(data18>1500,2))

Or if you are only interested in rows where the 1st column is > 1500, then

find(data18(:,1)>1500)

thanks

Answer 2

hi try :

 [x,y]=find(data18(:,1)>1500);

thanks!