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From: Matt Fig on 7 Aug 2010 16:48
"Mohammad " <jaber2(a)uni.uiuc.edu> wrote in message
> Thanks everyone. Just for educational purpose (So I can do this in the future) does the x(:) mean that x is changing, and what does the .' after Star signify.
>
> THANKS! this made my program a whole lot simpler.
>
> Cordially, Mohammad

Look

doc colon
doc transpose
From: Roger Stafford on 7 Aug 2010 16:57
"Mohammad " <jaber2(a)uni.uiuc.edu> wrote in message <i3ka4b$cd0$1(a)fred.mathworks.com>...
> "Roger Stafford" <ellieandrogerxyzzy(a)mindspring.com.invalid> wrote in message <i3k630$8dp$1(a)fred.mathworks.com>...
> > "Matt J " <mattjacREMOVE(a)THISieee.spam> wrote in message <i3k4eg$qp0$1(a)fred.mathworks.com>...
> > \> v=@(x) sum( bsxfun( @times, sin( pi*x(:)*(1:r) ),Star) , 2 ).';
> > - - - - - - - - - - -
> > You don't need bsxfun for this one:
> >
> > v = @(x) sin(pi*x(:)*(1:r))*Star.';
> >
> > Roger Stafford
>
> Thanks everyone. Just for educational purpose (So I can do this in the future) does the x(:) mean that x is changing, and what does the .' after Star signify.
>
> THANKS! this made my program a whole lot simpler.
>
> Cordially, Mohammad
- - - - - - - - -
No, x(:) makes a column vector out of the elements of x just in case your x was a row vector. (Actually it will make a column vector out of a matrix too.) The .' after Star takes its transpose. This is necessary so that the number of columns in sin(pi*x(:)*(1:r)) will equal the number of rows in Star.' and yield a valid matrix multiplication with the * operation in between them. You should read up in your matlab manual about indexing and matrix multiplication. It's an important part of one's matlab education.

Roger Stafford
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