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5
votes
3answers
241 views
Manipulating Matrices in Matlab
Suppose I have a matrix $A$ of size
$n_1 \times n_2 \times n_3$
Now, I have another matrix $B$ of size $n_1 \times n_2 \times n_3 \times N$ where $N<n_3$
I'd like to create the following matrix ...
5
votes
3answers
273 views
How do I know if my code is being vectorized by the compiler?
As exemplified by Jed Brown's answer to Costs of lookups versus calculations, using vectorized vs non-vectorized floating point operations results in much faster code. Many modern compilers claim ...
6
votes
1answer
228 views
How do I vectorize this 4-D matrix operation in Matlab?
I need to do a large number of matrix operations in Matlab, but one of the matrices is 4-D and my normal instincts for correct vectorization are failing me. Right now I'm using a loop. Maybe somebody ...
8
votes
2answers
1k views
Octave: calculate distance between two matrices of vectors
Suppose I have two matrices Nx2, Mx2 representing N, M 2d vectors respectively.
Is there a simple and good way to calculate distances between each vector pair (n, m)?
The easy but inefficient way is ...
