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4 Stand-Alone Applications

4-46

/* Print the results. */

mlfPrintMatrix(R);

/* Free the matrices allocated during this computation. */

mxDestroyArray(N);

mxDestroyArray(R);

PkgTerminate(); /* Terminate the library of M-functions */

}

An Explanation of mrankp.c

The heart of mrankp.c is a call to the mlfMrank function. Most of what comes

before this call is code that creates an input argument to

mlfMrank. Most of

what comes after this call is code that displays the vector that

mlfMrank

returns. First, the code must call the Compiler-generated library initialization

function.

PkgInitialize();/* Initialize the library of M-Functions */

To understand how to call mlfMrank, examine its C function header, which is

mxArray *mlfMrank(mxArray *n_rhs_)

According to the function header, mlfMrank expects one input parameter and

returns one value. All input and output parameters are pointers to the

mxArray

data type. (See “External Interfaces/API” in the MATLAB online

documentation for details on the

mxArray data type.) To create and manipulate

mxArray * variables in your C code, you can call the mx routines described in

the “External Interfaces/API” or any routine in the MATLAB C/C++ Math

Library. For example, to create a 1-by-1

mxArray * variable named N with real

data,

mrankp calls mlfScalar:

N = mlfScalar(n);

mrankp

can now call mlfMrank, passing the initialized N as the sole input

argument.

R = mlfMrank(N);

mlfMrank

returns a pointer to an mxArray * variable named R. The easiest way

to display the contents of

R is to call the mlfPrintMatrix convenience function:

mlfPrintMatrix(R);

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MATLAB APPLICATION DEPLOYMENT - WEB EXAMPLE GUIDE Guida Utente Pagina 122