Re: Create Matrices e.g. A = randn(5,5,3) in .oct file

[Carlo De Falco]

On 2 Apr 2015, at 23:40, babelproofreader <address@hidden> wrote:

> As part of an attempt to convert an Octave .m function to a .oct function I
> need to create an array of matrices, the typical Octave code for which looks
> like:-
> 
> A = 0.01 * randn( 5 , 5 , 3 ) ;


>> which randn
'randn' is a built-in function from the file libinterp/corefcn/rand.cc

How to call a builtin function in an oct-file is documented here:

http://www.gnu.org/software/octave/doc/interpreter/Calling-Octave-Functions-from-Oct_002dFiles.html#Calling-Octave-Functions-from-Oct_002dFiles

but is not recomended.


> 
> How would I code this in a .oct function? I'm even having problems with just
> declaring and creating a simple equivalent structure, e.g. Matrix A ( 5 , 5
> , 3 ) is only giving a single 5 by 5 matrix, not the three 5 by 5 matrices
> the octave code produces. 
> 

A Matrix with more than two indices is called an NDArray:

http://www.gnu.org/software/octave/doc/interpreter/Matrices-and-Arrays-in-Oct_002dFiles.html#Matrices-and-Arrays-in-Oct_002dFiles

HTH,
c.