matlab code question

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Rambo
Rambo 2011-4-1
I am new to matlab and need some help. Can somebody explain what the following code does? Isn't that going into an infinite loop?
Y(ii:ii+window-1).*hanw

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回答（2 个）

Andrew Newell
Andrew Newell 2011-4-1
I don't know what the variables are, but you're probably worried about the indexing. Let's take an example:
ii = 3;
window = 4;
ii:ii+window-1
ans =
3 4 5 6
It is a vector of consecutive integers, and Y(ii:ii+window-1) selects elements 3 to 6 of Y.
EDIT: See colon operator and Matrix Indexing in MATLAB.
Matt Tearle
Matt Tearle 2011-4-1
The colon in MATLAB is the range operator so ii:ii+window-1 gives the values ii, ii+1, ii+2, etc, for a total of window points. Hence this line of code extracts the window values of Y starting at the ii-th point, then multiplies them by the vector hanw.
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Jan
Jan 2011-4-1
... then multiplies them *elementwise* by the vector hanw.

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