Name

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, char* _pstName, int* _piRows, int* _piCols, int* _piBool)

Parameters

_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).

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

             
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
    CheckRhs(1,1);
    CheckLhs(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, Rhs + 1, iRows, iCols, piBool);
    if(sciErr.iErr)
    {
        printError(&sciErr, 0);
        return 0;
    }

    LhsVar(1) = Rhs + 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