Re: matrix with 3 indices

[Yoel Callev]

Yoel Callev wrote:

> scherer wrote:
>
> > Dear Sir
> > I am using OCTAVE as a programming language in a course on computational
> >
> > methos of Physics. At the moment I am teaching molecular dynamics: on a
> > rectangular
> > lattice of cells I need two indices to specify each cell and a third
> > index to enumerate
> > the atoms in the cell. In MATLAB I would simply create a matrix A with
> > elements
> > A(i, j, k), but this feature is apparently not suported by OCTAVE. Is
> > there an alternative?
> > Thanks for your answer.
> > Claudio Scherer
> You can use cells: A{k}(i,j).
> This way different cells (k's) can contain matrices of different 
> sizes, and these matrices can still be multiplied.
>
> You can allocate such arrays with cell(size), and read about it on the 
> MATLAB help under 'cell arrays', athough I havn't found any reference 
> in Octave's  help file, this feature does exists in Octave
Apperantly this was a mistake, cells don't work in Octave yet, (or at 
least not in the MATLAB syntax), but there is a different quick & dirty 
solution - just use:

eval(sprintf("my_matrix%d(%d,%d)",k,i,j));

and work with matrices named my_matrix1,my_matrix2 etc.

  -Yoel Callev (femto.tau.ac.il/~yoel)





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