[Scilab-Dev] How to create a Scilab structure ?

[Yann Collette]

Vincent a écrit :
> Hi,
>
> I would like to create a SciLab structure from C code. By scilab structure I 
> mean a variable that has some "children", for instance, as outputed by scilab 
> :
>
>  a  =
>  
>    a1: 1
>    a2: 2
>    a3: 3
>    a4: 4
>
> also with structure member instancied by a.a1=1, a.a2=2...
> It appears that such object are neither list nor tlist. So I have no idea how 
> to produce structure like that...
>
> Regards,
> Vincent.
>
>
>   
A structure is like a mlist:

a = struct();
a.a1 = 1;
a.a2 = 2;
a.a3 = [1 2 3 4];

getfield(1,a) =  !st  dims  a1  a2  a3  !

'st' is the type of the "struct" mlist and corresponds to the values 
returned by 'typeof(a)'
'dims' stores the dimension of a and is the value returned by 'size(a)'
and the remaining things are the labels.

You can access the values like a matlab struct:
disp(a.a1)
or like a Scilab mlist
disp(a('a1'))

To create such a structure using the new api_scilab:

int sci_new_api_mlist_out(char * fname)
{
  int res, i;
  int * p_out_address;
  char  *pstLabels[]   = {"st","dims","a1","a2","a3"};
  double pdblDims[]  = {1,1};
  double pdblA1[] = {1};
  double pdblA2[] = {1}; 
  double pdblA3[] = {1,2,3,4};

  res = createMList(1, 5, &p_out_address);

  // Add the labels at position 1 (in the first field).
  // We can get the labels using getfield(1,mymlist) in Scilab
  createMatrixOfStringInList(1, p_out_address, 1, 1, 5, pstLabels);

  // Add a vector to the 'dims' field
  createMatrixOfDoubleInList(1, p_out_address, 2, 1, 2, pdblDims);

  // Add the 'Ai' fields
  createMatrixOfDoubleInList(1, p_out_address, 3, 1, 1, pdblA1);
  createMatrixOfDoubleInList(1, p_out_address, 3, 1, 1, pdblA2);
  createMatrixOfDoubleInList(1, p_out_address, 3, 1, 4, pdblA3);

  // Return the created mlist
  LhsVar(1) = 1;

  return 0;
}



YC