Scilab 5.4.1
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Double management
How to manage Scilab's variable read and write process using call_scilab and api_scilab
Description
This help describes how doubles and matrix of doubles 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.
Note that the default type of a numeric value in Scilab is double. For example, in a=1 or a=[1,2], a will be consider as a double.
Note: Access to variables is done through api Scilab (named variable).
Examples
/* * Write a matrix into Scilab * B=[1 4 2 3; * 3 9 8 2 ] * Note that it is done column by column */ double B[] = {1,3,4,9,2,8,3,2}; /* Declare the matrix */ int rowB = 2, colB = 4; /* Size of the matrix */ char variableNameB[] = "B"; SciErr sciErr; /* * Write it into Scilab's memory */ sciErr = createNamedMatrixOfDouble(pvApiCtx,variableNameB,rowB,colB, B); /* pvApiCtx is a global variable */ if(sciErr.iErr) { printError(&sciErr, 0); } /* * Prior to Scilab 5.2: * C2F(cwritemat)(variableNameB, &rowB, &colB, B, strlen(variableNameB)); */ printf("\n"); printf("Display from Scilab of B:\n"); SendScilabJob("disp(B);"); /* Display B */
/* Read the previously declared matrix of double B */ int rowB_ = 0, colB_ = 0, lp_ = 0; double *matrixOfDoubleB = NULL; int i = 0, j = 0; char variableToBeRetrievedB[] = "B"; SciErr sciErr; /* First, retrieve the size of the matrix */ sciErr = readNamedMatrixOfDouble(pvApiCtx, variableToBeRetrievedB, &rowB_, &colB_, NULL); if(sciErr.iErr) { printError(&sciErr, 0); } /* * Prior to Scilab 5.2: * C2F(cmatptr)(variableToBeRetrievedB, &rowB_, &colB_, &lp_, strlen(variableToBeRetrievedB)); */ /* Alloc the memory */ matrixOfDoubleB = (double*)malloc((rowB_*colB_)*sizeof(double)); /* Load the matrix */ sciErr = readNamedMatrixOfDouble(pvApiCtx, variableToBeRetrievedB, &rowB_, &colB_, matrixOfDoubleB); if(sciErr.iErr) { printError(&sciErr, 0); } /* * Prior to Scilab 5.2: * C2F(creadmat)(variableToBeRetrievedB,&rowB_,&colB_,matrixOfDoubleB,strlen(variableToBeRetrievedB) ); */ 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 * expect */ printf("%5.2f ",matrixOfDoubleB[i * rowB_ + j]); } printf("\n"); /* New row of the matrix */ }
See Also
- Call_Scilab — call_scilab is an interface which provides the ability to call Scilab engine from C/C++ code
- api Scilab — api_scilab is the Scilab interface to read/write data from/to Scilab memory
- API_Scilab: Double reading — How to read matrices of double in a gateway.
- API_Scilab: Double writing — How to write matrices of doubles in a gateway.
- SendScilabJob — Send a Scilab task from a C/C++ code (call_scilab)
- StartScilab — Initializes and starts Scilab engine in Call Scilab
- Call_Scilab: BooleanManagement — How to manage Scilab's boolean read and write process using call_scilab and api_scilab
- Call_Scilab: ComplexManagement — How to manage Scilab's complex variable read and write process using call_scilab
- Call_Scilab: StringManagement — How to manage Scilab's String read and write process using call_scilab and api_scilab
- API_Scilab: Boolean Reading — How to read matrix of boolean.
- API_Scilab: Boolean Writing — How to write matrices of boolean.
- API_Scilab: String Reading — How to read matrices of strings in a gateway.
- API_Scilab: String Writing — How to write matrices of string in a gateway.
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