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MathLink C Function

MLGetRealArray()

int MLGetRealArray(MLINK link, double **a, long **dims, char ***heads, long *d)
gets an array of floating-point numbers from the MathLink connection specified by link, storing the array in a, its dimensions in dims and its depth in d.
  • The array a is laid out in memory like a C array declared as double a[m][n]....
  • heads gives a list of character strings corresponding to the names of symbols that appear as heads at each level in the array.
  • MLGetRealArray() allocates memory which must be released by calling MLDisownRealArray(). If MLGetRealArray() fails and the function's return value indicates an error, do not call MLReleaseRealArray() on the contents of a.
  • MLGetRealArray() returns immutable data.
  • MLGetRealArray() returns 0 in the event of an error, and a nonzero value if the function succeeds.
  • Use MLError() to retrieve the error code if MLGetRealArray() fails.
EXAMPLESCLOSE ALL
Basic Examples   (1)
#include "mathlink.h"

/* read an array of double-precision floating-point numbers from a link */

void f(MLINK lp)
{
    double *data;
    long *dims;
    char **heads;
    long d; /* stores the rank of the array */

    if(! MLGetRealArray(lp, &data, &dims, &heads, &d))
        {
            /* unable to read the array from lp */
            return;
        }

    /* ... */

    MLDisownRealArray(lp, data, dims, heads, d);    
}
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