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From: John Gar on 6 Jun 2010 14:38
Walter Roberson <roberson(a)hushmail.com> wrote in message <OLGEn.11$0M5.3(a)newsfe07.iad>...
> John Gar wrote:
>
> > I want to perform a vector operation.
> > I have a vector with a number X of elements and I want to divide this
> > vector to sub-groups. For example, i have a table with groups:
> >
> > 0 -100, 100 - 200, 200-300, 300-400, 400-510, 510 - 630, 630-770,
> > 770-920,...
> >
> > and I want to make some operation in my vector according to each group
> > separately (the groups are the index of the vector).
> >
> > How can I made such division? I can made it using "if", but it not seems
> > to be a good and proper solution.
>
> Store the breakpoints in a vector, e.g.,
>
> BP = [0 100 200 300 400 510 630 770 920 X];
>
> for K = 2:length(BP)
> Subvector = Vector(BP(K-1)+1:BP(K));
> operate on Subvector...
> end
>


Thanks to Walter I have the code that perform the operation in a Subvector and also in each group.
Continuing this post - I have another question.

In each Sub vector I need to find the maximum amplitude of my vector and change the values near to the max amplitude.
But, it's a continues change, i.e, in the first Subvector I change the nearest amplitudes of the maximum to zero (both sides of the max). The second Subvector change both sides of max to 1, the third change one side to 1 and the other to 0, the fourth one to 0 and the other side to 1, and it cames back to both sides to zero. (It's like a bit sequence).

I think to made this operation bu using of 'case' procedure, but maybe someone can help me with a simple and better solution.

Thank you.
From: Walter Roberson on 6 Jun 2010 18:33
John Gar wrote:

> In each Sub vector I need to find the maximum amplitude of my vector and
> change the values near to the max amplitude.
> But, it's a continues change, i.e, in the first Subvector I change the
> nearest amplitudes of the maximum to zero (both sides of the max). The
> second Subvector change both sides of max to 1, the third change one
> side to 1 and the other to 0, the fourth one to 0 and the other side to
> 1, and it cames back to both sides to zero. (It's like a bit sequence).
> I think to made this operation bu using of 'case' procedure, but maybe
> someone can help me with a simple and better solution.

switch/case would work fine. You could switch on mod(LoopIndex,4)
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