MATLAB COMPILER 4 Instrukcja Użytkownika Pobierz pdf (Strona 17)

5.4 Simple C++ Template for a MATLAB Library

In the following we show a template for a wrapper-class for simply including compiled

MATLAB source code into an existing system. Listing 5 is a scratch of a simple main

function that calls a constructor, runs a function deﬁned within the wrapper class and

ﬁnally calls a destructor. The class according to the created instance is given by Listing 6.

The main advantage of using such structure is that the programmer at C++ level must

not have any knowledge about the MATLAB-world. Initializing and destructing the

MATLAB-environment, converting the data to the correct format and calling functions

of the MATLAB C/C++ API is done within the wrapper-class. The same thing can be

done within only one C-function as well, but therefore the MATLAB environment has to

be initialized every time the function is called. For return values call by reference is used,

since the MATLAB functions often return more than one parameter. This is not a must,

but would be easier.

#in c lu d e " wrapper . h"

i n t main ( i n t argc , char * argv [])

{

// create the component

Temp late _ Comp onen t * pComp = new Te mpla te_C o mpon ent ();

// create the matrices in C- style

i n t Dim1 = 2; i n t Dim2 = 3;

double Matrix [2][3] = {{1 ,2 ,3} ,{4 ,5 ,6}};

double Result [2][3] = {0 ,0 ,0 ,0 ,0 ,0};

// call the service

pComp -> su bscri b e_dem o (( double *) Matrix , Dim1 , Dim2 , (double *) Result 1 );

...

// display the result in C - style

printf (" S ourcem a trix :\ n " );

printf (" %f %f %f\ n" , Matrix [0][0] , Matrix [0][1] , Matrix [0][2]);

printf (" %f %f %f\ n\ n " , Matrix [1][0] , Matrix [1][1] , Matrix [1][2]);

printf (" Result Matrix :\ n" );

printf (" %f %f %f\ n" , Result1 [0][0] , Result1 [0][1] , Result1 [0][2]);

printf (" %f %f %f\ n\ n " , Result1 [1][0] , Result1 [1][1] , Result1 [ 1 ][2]);

...

// delete the component

d e l e t e pComp ;

return 0;

}

Listing 5: main.cpp

1 2 ... 12 13 14 15 16 17 18 19 20 21

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MATLAB COMPILER 4 Instrukcja Użytkownika Strona 17