- Aide Scilab
- API Scilab
- Low level functions
- AssignOutputVariable
- CallOverloadFunction
- CheckInputArgument
- CheckOutputArgument
- ReturnArguments
- Boolean reading (Scilab gateway)
- Boolean writing (Scilab gateway)
- Boolean sparse reading (Scilab gateway)
- Boolean sparse writing (Scilab gateway)
- Check variable dimensions (Scilab gateway)
- Variable Reference (Scilab gateway)
- Variable dimension (Scilab gateway)
- Variable Type (Scilab gateway)
- Variable Complexity (Scilab gateway)
- Matrix Type (Scilab gateway)
- deleteNamedVariable
- Double reading (Scilab gateway)
- Double writing (Scilab gateway)
- getNbInputArgument (Scilab gateway)
- getNbOutputArgument (Scilab gateway)
- Integer Precision (Scilab gateway)
- Integer reading (Scilab gateway)
- Integer writing (Scilab gateway)
- Pointer reading (Scilab gateway)
- Pointer writing (Scilab gateway)
- Polynomial Symbolic Variable (Scilab gateway)
- Polynomial reading (Scilab gateway)
- Polynomial writing (Scilab gateway)
- Sparse matrix reading (Scilab gateway)
- Sparse writing (Scilab gateway)
- String reading (Scilab gateway)
- String writing (Scilab gateway)
Please note that the recommended version of Scilab is 2025.0.0. This page might be outdated.
However, this page did not exist in the previous stable version.
Double writing (Scilab gateway)
How to write matrices of doubles in a gateway.
Calling Sequence
Input argument profile:
SciErr createMatrixOfDouble(void* _pvCtx, int _iVar, int _iRows, int _iCols, const double* _pdblReal)
SciErr createComplexMatrixOfDouble(void* _pvCtx, int _iVar, int _iRows, int _iCols, const double* _pdblReal, double* _pdblImg)
Named variable profile:
SciErr createNamedMatrixOfDouble(void* _pvCtx, const char* _pstName, int _iRows, int _iCols, const double* _pdblReal)
SciErr createNamedComplexMatrixOfDouble(void* _pvCtx, const char* _pstName, int _iRows, int _iCols, const double* _pdblReal, const double* _pdblImg)
Arguments
- _pvCtx
Scilab environment pointer, pass in "pvApiCtx" provided by api_scilab.h.
- _iVar
Position in the Scilab memory where you want to put the variable.
- _pstName
Name of the variable for "named" functions.
- _iRows
Number of rows of the new variable.
- _iCols
Numbers of columns of the new variable.
- _pdblReal
Address of real data array (size: _iCols * _iRows).
- _pdblImg
Address of imaginary data array (size: _iCols * _iRows). This argument does not exist with createMatrixOfDouble and createNamedMatrixOfDouble.
- SciErr
Error structure where is stored errors messages history and first error number.
Calling Sequence
Input argument profile:
SciErr allocMatrixOfDouble(void* _pvCtx, int _iVar, int _iRows, int _iCols, double** _pdblReal)
SciErr allocComplexMatrixOfDouble(void* _pvCtx, int _iVar, int _iRows, int _iCols, double** _pdblReal, double** _pdblImg)
SciErr allocComplexZMatrixOfDouble(void* _pvCtx, int _iVar, int _iRows, int _iCols, double** _pdblReal, doublecomplex** _pdblData)
Arguments
- _pvCtx
Scilab environment pointer, pass in "pvApiCtx" provided by api_scilab.h.
- _iVar
Position in the Scilab memory where you want to put the variable.
- _iRows
Number of rows of the new variable.
- _iCols
Numbers of columns of the new variable.
- _pdblReal
Returns address of real data array (size: _iCols * _iRows).
- _pdblImg
Returns address of imaginary data array (size: _iCols * _iRows). This argument does not exist with allocMatrixOfDouble.
- _pdblData
Returns address of doublecomplex data array (size: _iCols * _iRows). This argument exists only in allocComplexZMatrixOfDouble.
- SciErr
Error structure where is stored errors messages history and first error number.
Gateway Source
#include "api_scilab.h" int write_double(char *fname,unsigned long fname_len) { SciErr sciErr; int i,j; //first variable info : real matrix of double 3 x 4 int iRows1 = 3; int iCols1 = 4; double* pdblReal1 = NULL; //second variable info : complex matrix of double 4 x 6 int iRows2 = 4; int iCols2 = 6; double* pdblReal2 = NULL; double* pdblImg2 = NULL; /************************ * First variable * ************************/ //alloc array of data in OS memory pdblReal1 = (double*)malloc(sizeof(double) * iRows1 * iCols1); //fill array with incremental values //[ 0 1 2 3 // 4 5 6 7 // 8 9 10 11] for(i = 0 ; i < iRows1 ; i++) { for(j = 0 ; j < iCols1 ; j++) { pdblReal1[i + iRows1 * j] = i * iCols1 + j; } } //can be written in a single loop //for(i = 0 ; i < iRows1 * iCols1; i++) //{ // pdblReal1[i] = i; //} //create a variable from a existing data array sciErr = createMatrixOfDouble(pvApiCtx, nbInputArgument(pvApiCtx) + 1, iRows1, iCols1, pdblReal1); if(sciErr.iErr) { printError(&sciErr, 0); return 0; } //after creation, we can free memory. free(pdblReal1); /************************* * Second variable * *************************/ //reserve space in scilab memory and fill it sciErr = allocComplexMatrixOfDouble(pvApiCtx, nbInputArgument(pvApiCtx) + 2, iRows2, iCols2, &pdblReal2, &pdblImg2); if(sciErr.iErr) { printError(&sciErr, 0); return 0; } //fill array with incremental values for real part and decremental for imaginary part //[ 23i 1+22i 2+21i 3+20i 4+19i 5+18i // 6+17i 7+16i 8+15i 9+14i 10+13i 11+12i // 12+11i 13+10i 14+9i 15+8i 16+7i 17+6i // 18+5i 19+4i 20+3i 21+2i 22+1i 23 ] for(i = 0 ; i < iRows2 ; i++) { for(j = 0 ; j < iCols2 ; j++) { pdblReal2[i + iRows2 * j] = i * iCols2 + j; pdblImg2 [i + iRows2 * j] = (iRows2 * iCols2 - 1) - (i * iCols2 + j); } } //can be written in a single loop //for(i = 0 ; i < iRows2 * iCols2; i++) //{ // pdblReal2[i] = i; // pdblImg2 [i] = (iRows2 * iCols2 - 1) - i; //} // /!\ DO NOT FREE MEMORY, in this case, it's the Scilab memory //assign allocated variables to Lhs position AssignOutputVariable(pvApiCtx, 1) = nbInputArgument(pvApiCtx) + 1; AssignOutputVariable(pvApiCtx, 2) = nbInputArgument(pvApiCtx) + 2; return 0; }
Scilab test script
a_ref = [ 0 1 2 3; .. 4 5 6 7; .. 8 9 10 11]; b_ref = [ 23*%i, 1+22*%i, 2+21*%i, 3+20*%i, 4+19*%i, 5+18*%i; .. 6+17*%i, 7+16*%i, 8+15*%i, 9+14*%i, 10+13*%i, 11+12*%i; .. 12+11*%i, 13+10*%i, 14+9*%i, 15+8*%i, 16+7*%i, 17+6*%i; .. 18+5*%i, 19+4*%i, 20+3*%i, 21+2*%i, 22+1*%i, 23]; [a,b] = write_double(); if or(a <> a_ref) then error("failed");end if or(b <> b_ref) then error("failed");end
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