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

2 Ansichten (letzte 30 Tage)
Anisa
Anisa am 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?

Akzeptierte Antwort

Jan
Jan am 6 Feb. 2013
E = reshape(B(B>2 & B<36), 1, []);

Weitere Antworten (1)

Hossein
Hossein am 6 Feb. 2013
Bearbeitet: Hossein am 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 Kommentar
Jan
Jan am 6 Feb. 2013
Bearbeitet: Jan am 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);

Melden Sie sich an, um zu kommentieren.

Kategorien

Mehr zu Resizing and Reshaping Matrices finden Sie in Help Center und File Exchange

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by