Polynomial writing (Scilab gateway)
How to write matrices of polynomials in a gateway.
Syntax
Input argument profile:
SciErr createMatrixOfPoly(void* _pvCtx, int _iVar, char* _pstVarName, int _iRows, int _iCols, const int* _piNbCoef, const double* const* _pdblReal)
SciErr createComplexMatrixOfPoly(void* _pvCtx, int _iVar, char* _pstVarName, int _iRows, int _iCols, const int* _piNbCoef, const double* const* _pdblReal, const double* const* _pdblImg)
Named variable profile:
SciErr createNamedMatrixOfPoly(void* _pvCtx, const char* _pstName, char* _pstVarName, int _iRows, int _iCols, const int* _piNbCoef, const double* const* _pdblReal)
SciErr createNamedComplexMatrixOfPoly(void* _pvCtx, const char* _pstName, char* _pstVarName, int _iRows, int _iCols, const int* _piNbCoef, const double* const* _pdblReal, const double* const* _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.
- _pstVarName
Variable name in polynomials (Scilab5: 4 characters max)
- _iRows
Number of rows of the new variable
- _iCols
Numbers of columns of the new variable
- _piNbCoef
Number of coefficient for each polynomial.
- _pdblReal
Address of array of double* with real part of coefficient (size: _iCols * _iRows)
- _pdblImg
Address of array of double* with imaginary part of coefficient (size: _iCols * _iRows)
- SciErr
Error structure where is stored errors messages history and first error number.
Description
This help describes how matrix of polynomials can be handled through the Scilab API.
Gateway Source
#include "api_scilab.h" int write_poly(char *fname,void* pvApiCtx) { SciErr sciErr; //output variable info : polinomial matrix 2 x 4 //[ x + 2 x^2 - 4x + 5 4x^3 - 14x^2 + 18 ; // 2x^3 - 12x^2 + 64 1 8x^5 + 32x^3] int iRows = 2; int iCols = 3; //varname "x" char pstVarName[2] = {"x"}; //coeficient array int piNbCoef[6] = {2,4,3,1,4,6}; //data array double *pdblReal[6] = {0}; double pdblPoly0[2] = {2,1}; double pdblPoly1[4] = {64,0,-12,2}; double pdblPoly2[3] = {5,-4,1}; double pdblPoly3[1] = {1}; double pdblPoly4[4] = {18,0,-14,4}; double pdblPoly5[6] = {0,0,0,32,0,8}; pdblReal[0] = pdblPoly0; pdblReal[1] = pdblPoly1; pdblReal[2] = pdblPoly2; pdblReal[3] = pdblPoly3; pdblReal[4] = pdblPoly4; pdblReal[5] = pdblPoly5; sciErr = createMatrixOfPoly(pvApiCtx, nbInputArgument(pvApiCtx) + 1, pstVarName, iRows, iCols, piNbCoef, pdblReal); if(sciErr.iErr) { printError(&sciErr, 0); return 0; } //assign allocated variables to Lhs position AssignOutputVariable(pvApiCtx, 1) = nbInputArgument(pvApiCtx) + 1; return 0; }
Scilab test script
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