Scilab 5.3.1
- Aide Scilab
- API Scilab
- Low level functions
- Boolean reading (Scilab gateway)
- Boolean writing (Scilab gateway)
- Boolean sparse reading (Scilab gateway)
- Boolean sparse writing (Scilab gateway)
- Variable Reference (Scilab gateway)
- Variable dimension (Scilab gateway)
- Variable Type (Scilab gateway)
- Variable Complexity (Scilab gateway)
- Matrix Type (Scilab gateway)
- Double reading (Scilab gateway)
- Double writing (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 This page might be outdated.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 reading (Scilab gateway)
How to read matrices of double in a gateway.
Calling Sequence
Input argument profile:
SciErr getMatrixOfDouble(void* _pvCtx, int* _piAddress, int* _piRows, int* _piCols, double** _pdblReal)
SciErr getComplexMatrixOfDouble(void* _pvCtx, int* _piAddress, int* _piRows, int* _piCols, double** _pdblReal, double** _pdblImg)
Named variable profile:
SciErr readNamedMatrixOfDouble(void* _pvCtx, const char* _pstName, int* _piRows, int* _piCols, double* _pdblReal)
SciErr readNamedComplexMatrixOfDouble(void* _pvCtx, const char* _pstName, int* _piRows, int* _piCols, double* _pdblReal, double* _pdblImg)
Arguments
- _pvCtx
Scilab environment pointer, pass in "pvApiCtx" provided by api_scilab.h
- _piAddress
Address of the Scilab variable.
- _pstName
Name of the variable for "named" functions.
- _piRows
Return number of rows.
- _piCols
Return number of columns.
- _pdblReal
Return address of real data array (size: _iCols * _iRows). For "Named" function, _pdblReal must be allocated before calling function.
- _pdblImg
- Return address of imaginary data array (size: _iCols * _iRows). For "Named" function, _pdblImg must be allocated before calling function.
- SciErr
Error structure where is stored errors messages history and first error number.
Description
This help describes how matrix of doubles can be handled through the Scilab API.
Gateway Source
int read_double(char *fname,unsigned long fname_len) { int i; //first variable info : real matrix of double int iType = 0; int iRows = 0; int iCols = 0; int iComplex = 0; int *piAddr = NULL; double* pdblReal = NULL; double* pdblImg = NULL; SciErr sciErr; //check input and output arguments CheckRhs(1,1); CheckLhs(1,1); /************************ * First variable * ************************/ //get variable address of the first input argument sciErr = getVarAddressFromPosition(pvApiCtx, 1, &piAddr); if(sciErr.iErr) { printError(&sciErr, 0); return 0; } //check type sciErr = getVarType(pvApiCtx, piAddr, &iType); if(sciErr.iErr || iType != sci_matrix) { printError(&sciErr, 0); return 0; } //get complexity iComplex = isVarComplex(pvApiCtx, piAddr); //check complexity if(iComplex) { //get size and data from Scilab memory sciErr = getComplexMatrixOfDouble(pvApiCtx, piAddr, &iRows, &iCols, &pdblReal, &pdblImg); } else { //get size and data from Scilab memory sciErr = getMatrixOfDouble(pvApiCtx, piAddr, &iRows, &iCols, &pdblReal); } if(sciErr.iErr) { printError(&sciErr, 0); return 0; } //Do something with data //if variable is complex, switch real part and imaginary part otherwise multiply by -1 if(iComplex) { sciErr = createComplexMatrixOfDouble(pvApiCtx, Rhs + 1, iRows, iCols, pdblImg, pdblReal); } else { for(i = 0 ; i < iRows * iCols ; i++) { pdblReal[i] = pdblReal[i] * -1; } sciErr = createMatrixOfDouble(pvApiCtx, Rhs + 1, iRows, iCols, pdblReal); } if(sciErr.iErr) { printError(&sciErr, 0); return 0; } LhsVar(1) = Rhs + 1; return 0; }
Scilab test script
a = [ 0 1 2 3; .. 4 5 6 7; .. 8 9 10 11]; b = [ 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]; a2 = read_double(a); b2 = read_double(b); if or(a2 <> a * -1) then error("failed"), end if or(b2 <> (imag(b) + real(b) * %i)) then error("failed"), end
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