How do I simplify this code (remove for loop)?
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I'm trying to get in the habit of writing my code in terms of matrix operations and using as few for loops as possible. Is there a better way to write this code without the for loop?
for ii=1:N
if (acos(dot(rel_vec,vec_array(:,ii))) > pi/2)
vec_array(:,ii) = -vec_array(:,ii);
end
end
vec_array is matrix containing N vectors (3xN). I compare each vector in the matrix to make sure they're within 180 degrees of some relative vector (rel_vec). If the vector is more than 180 degrees away, I multiply the vector by -1.
采纳的回答
Oleg Komarov
2011-6-21
idx = acos(rel_vec * vec_array) > pi/2;
rvec(:,idx) = -rvec(:,idx);
where rel_vec is 1 by 3.
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