I have a 3XN
matrix representing a list of 3D coordinates,something like
33 33 33 33 34 34 34 34 34 35 35
17 18 19 20 16 17 18 19 20 16 17
10 10 10 10 10 10 10 10 10 10 10
I want to shift all coordinates by some vector v=[1 2 3]
, that is add the 3D vector to each column of the matrix.
I know how to do that with a for
loop, but how can I do it without a loop? Surely there's a way...
you mean like this?
D=[33 33 33 33 34 34 34 34 34 35 35;
17 18 19 20 16 17 18 19 20 16 17;
10 10 10 10 10 10 10 10 10 10 10 ];
A=[1 2 3]';
C= bsxfun(@plus, D, A)
C =
34 34 34 34 35 35 35 35 35 36 36
19 20 21 22 18 19 20 21 22 18 19
13 13 13 13 13 13 13 13 13 13 13
Use repmat
:
M = randn(3, N); % your 3 x N matrix
v = randn(3, 1); % your vector
r = M + repmat(v, [1 N]); % add v to every column of M
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