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mr mo
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How can I delete some rows of a matrix

Asked by mr mo
on 9 Nov 2017
Latest activity Commented on by mr mo
on 9 Nov 2017
Hi. Suppose I have matrix A e.g.
A=[8.2505 4.8825 2.2563 0.0020 0
8.2505 4.8825 2.2687 0.0020 1
8.2505 4.8825 2.2813 0.0020 2
8.2505 4.9325 2.2813 0.0020 0
8.2505 4.9325 2.2938 0.0020 3
8.2755 4.7575 2.2437 0.0020 0
8.2755 4.7575 2.2563 0.0020 0
8.2755 4.7575 2.2687 0.0020 2
8.2755 4.8075 2.2188 0.0020 0
8.2755 4.8075 2.2313 0.0020 3
8.2755 4.8075 2.2437 0.0020 1
8.2755 4.8075 2.2563 0.0010 0
8.2755 4.8075 2.2687 0.0010 2];
I want to delete the rows that their fifth column values are unequal to 0 and at the end I want to have the new matrix A without these rows.
Thanks a lot.

  2 Comments

dpb
on 9 Nov 2017
Which leaves a column of zeros???
At the end I want this :
A=[8.2505 4.8825 2.2563 0.0020 0
8.2505 4.9325 2.2813 0.0020 0
8.2755 4.7575 2.2437 0.0020 0
8.2755 4.7575 2.2563 0.0020 0
8.2755 4.8075 2.2188 0.0020 0
8.2755 4.8075 2.2563 0.0010 0];

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1 Answer

Answer by James Tursa
on 9 Nov 2017
Edited by James Tursa
on 9 Nov 2017
 Accepted Answer

A = A(A(:,5)==0,:);
or
A(A(:,5)~=0,:) = [];

  4 Comments

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At the end I want this :
A=[8.2505 4.8825 2.2563 0.0020 0
8.2505 4.9325 2.2813 0.0020 0
8.2755 4.7575 2.2437 0.0020 0
8.2755 4.7575 2.2563 0.0020 0
8.2755 4.8075 2.2188 0.0020 0
8.2755 4.8075 2.2563 0.0010 0];
This code gives the desired result you posted above. So I am not certain what the problem is at this point.
I made a little mistake. you're right. Thanks a lot.

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