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Locks

deleting a full colum using

Asked by Locks
on 17 Mar 2013

I have a matrix with several optionprice data. Now I am trying to delete rows based on a for loop and if criteria. if the value of column 8 is >1.1 or <0.9, the whole row should be deletet. I have used the following code, but I always get an error message:

for i=1:numel(matrix)

    if(matrix(i,8)>1.1)
        matrix(i,:) = [];
    end

end

why does that no work and what ways are there to delete those rows? the matrix is a double matrix

  1 Comment

Jan Simon
on 17 Mar 2013

Please post the error message whenever you explain, that there is an error.

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2 Answers

Answer by Jan Simon
on 17 Mar 2013
Edited by Jan Simon
on 17 Mar 2013
 Accepted answer

numel(matrix) is the number of all elements. When you have deleted some rows already, the matrix has less elements and matrix(i,8) might be not existing anymore already.

You do not need a loop, to solve this problem:

matrix(matrix(:, 8) > 1.1, :) = []

  0 Comments


Answer by Locks
on 17 Mar 2013

thanks!

  2 Comments

Sven
on 17 Mar 2013

Sven, you're giving me a bad name... please hit the "Accept Answer" button when an answer solves your problem.

(but feel free to say thanks in a comment (like this one) rather than making a new answer)

Azzi Abdelmalek
on 17 Mar 2013

Sven, if the answer helped, click on accept this answer. Also, to add a comment, click on comment on this answer just under the answer.


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