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Asked by Lalit Patil
on 25 Dec 2012

A = [1 2 3;2 3 4;3 4 5;4 5 6;5 6 7;6 7 8;7 8 9] B = [2 3 4;6 7 8] flag = ~ismember(A,B,'rows'); index = find(flag); q = A(index(flag))

The error is

??? Index exceeds matrix dimensions.

and The index finds only first elements of each row. The remaining two should also find it.. So, how to do it.?

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Answer by Walter Roberson
on 25 Dec 2012

Are these integers or numbers with fractions? If they are numbers with fractions then you cannot use ismember() in most cases.

http://matlab.wikia.com/wiki/FAQ#Why_is_0.3_-_0.2_-_0.1_.28or_similar.29_not_equal_to_zero.3F

## 2 Comments

## Matt J

Direct link to this comment:http://www.mathworks.com/matlabcentral/answers/57357#comment_119018

The index finds only first elements of each row. The remaining two should also find it.This is not clear. Write explicitly what you want "index" and "q" to be.

## Andrei Bobrov

Direct link to this comment:http://www.mathworks.com/matlabcentral/answers/57357#comment_119047

or