Condition which reduces the size of the vector

Question

Manpreet Kapoor 2011-5-11

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Hi,

I have a query.

Generally relational operators are used to check whether some condition is true. i.e. it returns a logical vector. Is it possible that the new vector has the same values as the original vector (based on some conditions), but it must change the size of the vector neglecting the values which do not satisfy the condition. For eg, Suppose there is a vector with 10 elements [say (1,3,2,1,4,6,7,8,5,2)]and i put a condition that the new vector is formed such that it has elements which are only less than a value(say 5). Thus the new vector must have only 6 elements(neglecting the terms higher than 5) How is that possible?

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Answer 1

Matt Fig 2011-5-11

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v = [1,3,2,1,4,6,7,8,5,2];
vnew = v(v<5)  % Returns: vnew = [1 3 2 1 4 2]

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Answer 2

Andy 2011-5-11

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I don't quite understand your question. If

A = [1,3,2,1,4,6,7,8,5,2];

then you say the new vector should have six elements. But this input vector has seven elements not higher than 5. I will assume this was just a typo. I think you want the following:

B = A(A<6);

This should return B = [1,3,2,1,4,5,2].