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Full Discussion: Return two dimensional array in c++
Top Forums Programming Return two dimensional array in c++ Post 302600222 by saboture88 on Monday 20th of February 2012 11:57:51 AM
Old 02-20-2012
Return two dimensional array in c++
I am writing matrix multiplication and trying to return a two dimensional array from a function but I keep getting errors. Can someone please help me?

here is my code (it is just the skeleton of my program):
Code:
void main ()
{
...
int *matmultiply (int, int, int, int [] [mat_cols], int [] [vec_cols], int [][vec_cols])
...
}

int *matmultiply (int mat_rows, int mat_cols, int vec_cols, int matrix [] [mat_cols], int vector [] [vec_cols], int result [][vec_cols])
{
for (int i = 0; i < mat_rows; i++)
        {
        res = 0;      //Stores result of multiplication
     for (int k = 0; k < vec_cols; k++)
    {
    int vrows = 0;
        for (int j = 0; j < mat_cols; j++)
                {
                res = res + ((matrix [i] [j]) * (vector [vrows] [k]));
                vrows++;
                }
      result [i] [k]= res;
    }
    } 
return result;     //This is the problem
}
//matmultiply performs multiplication and returns the result matrix.

Any help is appreciated.
 

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LEARN ABOUT NETBSD

timeradd

TIMERADD(3)						   BSD Library Functions Manual 					       TIMERADD(3)

NAME

     timeradd -- operations on time structure

SYNOPSIS

     #include <sys/time.h>

     void
     timeradd(struct timeval *a, struct timeval *b, struct timeval *res);

     void
     timersub(struct timeval *a, struct timeval *b, struct timeval *res);

     void
     timerclear(struct timeval *tv);

     int
     timerisset(struct timeval *tv);

     int
     timercmp(struct timeval *a, struct timeval *b, CMP);

     void
     timespecadd(struct timespec *a, struct timespec *b, struct timespec *res);

     void
     timespecsub(struct timespec *a, struct timespec *b, struct timespec *res);

     void
     timespecclear(struct timespec *ts);

     int
     timespecisset(struct timespec *ts);

     int
     timespeccmp(struct timespec *a, struct timespec b, CMP);

DESCRIPTION

     These macros are provided for manipulating the timeval and timespec structures described in timeval(3).

     The timeradd() and timespecadd() macros add the time information stored in a to b, storing the result in res.  With timeradd() the results
     are simplified such that the value of res->tv_usec is always less than 1,000,000 (1 second).  With timespecadd() the res->tv_nsec member of
     struct timespec is always less than 1,000,000,000.

     The timersub() and timespecsub() macros subtract the time information stored in b from a and store the resulting structure in res.

     The timerclear() and timespecclear() macros initialize the structures to midnight (0 hour) January 1st, 1970 (the Epoch).	In other words,
     they set the members of the structure to zero.

     The timerisset() and timespecisset() macros return true if the input structure is set to any time value other than the Epoch.

     The timercmp() and timespeccmp() macros compare a to b using the comparison operator given in CMP.  The result of the comparison is returned.

SEE ALSO

     timeval(3)

HISTORY

     The timeradd() family of macros first appeared in NetBSD 1.1.  These were later ported to FreeBSD 2.2.6.  The timespec() family of macros
     first appeared in NetBSD 1.2.

BSD
								   June 7, 2010 							       BSD
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