Bhilding new matrix with selected index number
3 views (last 30 days)
Show older comments
Suppose I have a matrix a:
a = [9;1;3;2;5;6;8;1;2;5;8;2];
And I have another matrix b which is like some selected index number of matrix a:
b = [4;6;1]; % for example 4 means forth row in matrix a which is 2 here
So, I need to have a new matrix c in that way present those rows in matrix a which are indicated in matrix b and others array be equal to 0:
c = [9,0,0,2,0,6,0,0,0,0,0,0]; % for example first array is 9 because the first row is (1) is in the matrix b and the value is equal 9 because first row in matrix a is 9.
0 Comments
Accepted Answer
Orion
on 29 Oct 2014
just use b as an index vector :
a = [9;1;3;2;5;6;8;1;2;5;8;2];
b = [4;6;1];
c=zeros(1,length(a));
c(b) = a(b);
0 Comments
More Answers (0)
See Also
Categories
Find more on Matrices and Arrays in Help Center and File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!