compare loops and matrix computation.

2013 5 30
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Hi, all,
I recently found that Matlab executes matrix/vector computation pretty fast than scalar computation with loops. For example, if I used loops to execute algorithm, it is very slow. If I convert it to vector or matrix, it is faster.
I was told about this fact before, is there any explanation on it?
The bad thing is that you cannot always use matrix to replace loops...
Thanks.

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