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Scilab help >> call_scilab API (Scilab engine) > Boolean management

# Boolean management

How to manage Scilab's boolean read and write process using call_scilab and api_scilab

### Description

This help describes how boolean and matrix of booleans can be handle through the Call Scilab API and api Scilab.

There are several functions which can be used to read / write from the memory of Scilab. These functions are described in dedicated pages.

### Examples

```/*
* Write a matrix of boolean into Scilab
* B=[F F T F;
*    F F F T ]
* Note that it is done column by column
*/
int B[]={0,0,0,0,1,0,0,1};   /* Declare the matrix */
int rowB=2, colB=4; /* Size of the matrix */
char variableNameB[] = "B";
SciErr sciErr;

/* Write it into Scilab's memory */
sciErr = createNamedMatrixOfBoolean(pvApiCtx, variableNameB, rowB, colB, B);
if(sciErr.iErr)
{
printError(&sciErr, 0);
}

/*
* Prior to Scilab 5.2:
* C2F(cwritebmat)(variableNameB, &rowB, &colB, B, strlen(variableNameB));
*/

printf("Display from Scilab of B:\n");
SendScilabJob("disp(B);"); /* Display B */```
```/* Read the previously declared matrix of boolean B */
int rowB_ = 0, colB_ = 0, lp_ = 0;
int i = 0, j = 0;
int *matrixOfBooleanB = NULL; /* Int instead of double */

char variableToBeRetrievedB[] = "B";
SciErr sciErr;
/* First, retrieve the size of the matrix */
sciErr = readNamedMatrixOfBoolean(pvApiCtx, variableToBeRetrievedB, &rowB_, &colB_, NULL);
if(sciErr.iErr)
{
printError(&sciErr, 0);
}

/*
* Prior to Scilab 5.2:
* C2F(cmatbptr)(variableToBeRetrievedB, &rowB_, &colB_, &lp_, strlen(variableToBeRetrievedB));
*/

/* Alloc the memory */
matrixOfBooleanB=(int*)malloc((rowB_*colB_)*sizeof(int));

sciErr = readNamedMatrixOfBoolean(pvApiCtx, variableToBeRetrievedB, &rowB_, &colB_, matrixOfBooleanB);
if(sciErr.iErr)
{
printError(&sciErr, 0);
}

/*
* Prior to Scilab 5.2:
*/

printf("\n");
printf("Display from B formated (size: %d, %d):\n",rowB_, colB_);
for(j = 0 ; j < rowB_ ; j++)
{
for(i = 0 ; i < colB_ ; i++)
{
/* Display the formated matrix ... the way the user expects */
printf("%d ",matrixOfBooleanB[i * rowB_ + j]);
}
printf("\n"); /* New row of the matrix */
}```

Sylvestre Ledru