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From: us on 17 Jun 2010 05:53
Oscar Lopez <oslo.garcia(a)gmail.com> wrote in message <f5775e1b-4165-41c6-b723-8d6691a75b15(a)q12g2000yqj.googlegroups.com>...
> I have several functions which depend on three variables. Each
> variable is stored in a vector and the function is computed by looping
> over the three vectors.
>
> I am thinking in the best way of storing the information from a
> programming and performance point of view. Two possibilities come to
> my mind:
>
> 1. Matrix with three indexes A(i,j,k)
> 2. Cell vector in which every element of the cell is a matrix with two
> indexes A{i}(j,k)
>
> What is the MATLAB recommended way of programming this situation? Are
> there any recommendations regarding three index matrices or cells?
>
> TIA

use #1 whenever possible...

us
From: Thomas Britton on 17 Jun 2010 06:59
#1 is indexed faster
Ideally you want to cycle along the columns rather than the rows (as matlab is column based).

However if you are having memory issues #2 may help you. Each 'bucket' of the cell is stored as a separate contiguous array.

"us " <us(a)neurol.unizh.ch> wrote in message <hvcr9v$78a$1(a)fred.mathworks.com>...
> Oscar Lopez <oslo.garcia(a)gmail.com> wrote in message <f5775e1b-4165-41c6-b723-8d6691a75b15(a)q12g2000yqj.googlegroups.com>...
> > I have several functions which depend on three variables. Each
> > variable is stored in a vector and the function is computed by looping
> > over the three vectors.
> >
> > I am thinking in the best way of storing the information from a
> > programming and performance point of view. Two possibilities come to
> > my mind:
> >
> > 1. Matrix with three indexes A(i,j,k)
> > 2. Cell vector in which every element of the cell is a matrix with two
> > indexes A{i}(j,k)
> >
> > What is the MATLAB recommended way of programming this situation? Are
> > there any recommendations regarding three index matrices or cells?
> >
> > TIA
>
> use #1 whenever possible...
>
> us
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