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- Boolean sparse reading (Scilab gateway)
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- 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)
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- 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 2024.1.0. This page might be outdated.
However, this page did not exist in the previous stable version.
Sparse matrix reading (Scilab gateway)
How to read sparse matric in a gateway.
Calling Sequence
Input argument profile:
SciErr getSparseMatrix(void* _pvCtx, int* _piAddress, int* _piRows, int* _piCols, int* _piNbItem, int** _piNbItemRow, int** _piColPos, double** _pdblReal)
SciErr getComplexSparseMatrix(void* _pvCtx, int* _piAddress, int* _piRows, int* _piCols, int* _piNbItem, int** _piNbItemRow, int** _piColPos, double** _pdblReal, double** _pdblImg)
Named variable profile:
SciErr readNamedSparseMatrix(void* _pvCtx, const char* _pstName, int* _piRows, int* _piCols, int* _piNbItem, int* _piNbItemRow, int* _piColPos, double* _pdblReal)
SciErr readNamedComplexSparseMatrix(void* _pvCtx, const char* _pstName, int* _piRows, int* _piCols, int* _piNbItem, int* _piNbItemRow, int* _piColPos, 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.
- _piNbItem
Return number of non zero value.
- _piNbItemRow
Return number of item in each rows (size: _iRows).
- _piColPos
Return column position for each item (size: _iNbItem).
- _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 sparse matrix can be handled through the Scilab API.
Gateway Source
int read_sparse(char *fname,unsigned long fname_len) { SciErr sciErr; int i,j,k; int* piAddr = NULL; int iRows = 0; int iCols = 0; int iNbItem = 0; int* piNbItemRow = NULL; int* piColPos = NULL; double* pdblReal = NULL; double* pdblImg = NULL; CheckRhs(1,1); sciErr = getVarAddressFromPosition(pvApiCtx, 1, &piAddr); if(sciErr.iErr) { printError(&sciErr, 0); return 0; } if(isVarComplex(pvApiCtx, piAddr)) { sciErr = getComplexSparseMatrix(pvApiCtx, piAddr, &iRows, &iCols, &iNbItem, &piNbItemRow, &piColPos, &pdblReal, &pdblImg); } else { sciErr = getSparseMatrix(pvApiCtx, piAddr, &iRows, &iCols, &iNbItem, &piNbItemRow, &piColPos, &pdblReal); } if(sciErr.iErr) { printError(&sciErr, 0); return 0; } sciprint("Sparse %d item(s)\n", iNbItem); k = 0; for(i = 0 ; i < iRows ; i++) { for(j = 0 ; j < piNbItemRow[i] ; j++) { sciprint("(%d,%d) = %f", i+1, piColPos[k], pdblReal[k]); if(isVarComplex(pvApiCtx, piAddr)) { sciprint(" %+fi", pdblImg[k]); } sciprint("\n"); k++; } } //assign allocated variables to Lhs position LhsVar(1) = 0; return 0; }
Scilab test script
sp=sparse([1,2;4,5;3,10],[1 + 2*%i,2 - 3*%i,-3 + 4*%i]); read_sparse(sp);
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