Re: [eclipse-clp-users] Array Dimension

Igor Kondrasovas wrote:

> I have a simple question regarding array dimension. I must create a
> 2-dimension array based on the size of two 1-dimension arrays. For instance:
> 
>  
> 
> I have a predicate like:
> 
>  
> 
> Linear(pieces, bars):- % pieces and bars are 1 dimensional arrays (from any
> length). Then I must create a 2 dimension array based on its size:
> 
>  
> 
> dim(M,[pieces length, bars length]),
> 
>  

I assume you know that the syntax you are showing (with predicate name 
Linear and variable names pieces and bars) are not correct 
ECLiPSe/Prolog syntax: predicate names should start with a small letter, 
and variable names should start with a capital letter.

As the User Manual says in the section on Array Notation (in the 
ECLiPSee-specific Language Feature chapter):

 >To create multi-dimensional arrays conveniently, the built-in dim/2 is 
 >provided (it can also be used backwards to access the array dimensions)

so you can use dim/2 to get the dimensions of the pieces and bars:

linear(Pieces, Bars) :-
    dim(Pieces, [PSize]), % get size of Pieces
    dim(Bars, [BSize]),   % get size of Bars
    dim(M, [PSize, BSize]), % create new matrix M
    ...

This assumes (as you stated) that Pieces and Bars are one dimensional 
arrays (i.e. structures) when you call linear/2.

Cheers,

Kish
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