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Справка Scilab >> API Scilab > Low level functions > Boolean reading (Scilab gateway)

Boolean reading (Scilab gateway)

How to read matrix of boolean.

Calling Sequence

Input argument profile:

SciErr getMatrixOfBoolean(void* _pvCtx, int* _piAddress, int* _piRows, int* _piCols, int** _piBool)

Named variable profile:

SciErr readNamedMatrixOfBoolean(void* _pvCtx, const char* _pstName, int* _piRows, int* _piCols, int* _piBool)

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 of the variable.

_piCols

Return number of columns of the variable.

_piBool

Return address of data array (size: _iRows * _iCols). For "Named" function, _piBool must be allocated before calling function.

SciErr

Error structure where is stored errors messages history and first error number.

Description

This help describes how to read matrix of boolean.

Gateway Source

#include "api_scilab.h"
int read_write_boolean(char *fname,unsigned long fname_len)
{
    SciErr sciErr;
    int i;
    //first variable info : real matrix of double
    int iRows       = 0;
    int iCols       = 0;
    int *piAddr     = NULL;
    int* piBool     = NULL;

    //check input and output arguments
    CheckInputArgument(pvApiCtx, 1,1);
    CheckOutputArgument(pvApiCtx, 1,1);

    //get variable address of the first input argument
    sciErr = getVarAddressFromPosition(pvApiCtx, 1, &piAddr);
    if(sciErr.iErr)
    {
        printError(&sciErr, 0);
        return 0;
    }

    //get size and data from Scilab memory
    sciErr = getMatrixOfBoolean(pvApiCtx, piAddr, &iRows, &iCols, &piBool);
    if(sciErr.iErr)
    {
        printError(&sciErr, 0);
        return 0;
    }

    //Do something with data
    for(i = 0 ; i < iRows * iCols ; i++)
    {
        piBool[i] = piBool[i] == 0 ? 1 : 0;
    }

    sciErr = createMatrixOfBoolean(pvApiCtx, nbInputArgument(pvApiCtx) + 1, iRows, iCols, piBool);
    if(sciErr.iErr)
    {
        printError(&sciErr, 0);
        return 0;
    }

    AssignOutputVariable(pvApiCtx, 1) = nbInputArgument(pvApiCtx) + 1;
    return 0;
}

Scilab test script

a = [%t, %f, %t ; %f, %t, %f ; %t, %f, %t];
a_ref = [%f, %t, %f ; %t, %f, %t ; %f, %t, %f];
b = read_write_boolean(a);

if or(b <> a_ref) then error("failed"), end
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Last updated:
Thu Oct 02 14:01:18 CEST 2014