deleting a full colum using

2013 3 17
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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

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Jan
Jan 2013-3-17
Please post the error message whenever you explain, that there is an error.

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Jan
Jan 2013-3-17
编辑：Jan 2013-3-17

0 个投票

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, :) = []

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Locks
Locks 2013-3-17

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thanks!

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Sven
Sven 2013-3-17
编辑：Sven 2013-3-17
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
Azzi Abdelmalek 2013-3-17
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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