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How to pick the elements of matrix only for selected value?

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Anisa
Anisa on 6 Feb 2013
I have a matrix named B with size 128x128. The matrix has elements with different value in range from 2-196. I want to use the elements with value only 2-36 and arrange it into a row.
For example:
B = [14 7 89 157 190 45 26; 144 11 9 20 78 23 123; 1 13 23 8 100 88 31; 6 30 33 145 166 29 15]
I want to pick the value only in range 2-36, and rearrange it into a row.
E = [ 14 7 26 11 9 20 23 13 23 8 31 6 30 33 19 15]
How to do this?

More Answers (1)

Hossein
Hossein on 6 Feb 2013
Edited: Hossein on 6 Feb 2013
First, I'd convert it to a column vector:
BC = B(:);
Then, I'd use find() to search in values:
E = BC(find(BC>=2).*find(BC<=36));
You can also use find() on a matrix directly, which I leave it to you to discover, type:
Help find
  1 Comment
Jan
Jan on 6 Feb 2013
find(BC >= 2) .* find(BC <= 36) fails, when the number of elements differ. Using logical indexing is more efficient, such that you can omit the find. And then the ".*" becomes equivalent to the and() operation:
E = BC(BC >= 2 & BC <= 36);

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