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

Asked by Locks on 1 May 2013

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?

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Locks

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2 Answers

Answer by James Tursa on 1 May 2013
Edited by James Tursa on 1 May 2013
Accepted answer

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)

1 Comment

Locks on 1 May 2013

thanks

James Tursa
Answer by Youssef KHMOU on 1 May 2013
Edited by Youssef KHMOU on 1 May 2013

hi try :

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

1 Comment

Locks on 1 May 2013

thanks!

Youssef  KHMOU

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