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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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PG_FIELD_IS_NULL(3)													       PG_FIELD_IS_NULL(3)

pg_field_is_null - Test if a field is SQL NULL

SYNOPSIS
int pg_field_is_null (resource $result, int $row, mixed $field) DESCRIPTION
int pg_field_is_null (resource $result, mixed $field) pg_field_is_null(3) tests if a field in a PostgreSQL result resource is SQL NULL or not. Note This function used to be called pg_fieldisnull(3). PARAMETERS
o $result - PostgreSQL query result resource, returned by pg_query(3), pg_query_params(3) or pg_execute(3) (among others). o $row - Row number in result to fetch. Rows are numbered from 0 upwards. If omitted, current row is fetched. o $field - Field number (starting from 0) as an integer or the field name as a string. RETURN VALUES
Returns 1 if the field in the given row is SQL NULL, 0 if not. FALSE is returned if the row is out of range, or upon any other error. EXAMPLES
Example #1 pg_field_is_null(3) example <?php $dbconn = pg_connect("dbname=publisher") or die ("Could not connect"); $res = pg_query($dbconn, "select * from authors where author = 'Orwell'"); if ($res) { if (pg_field_is_null($res, 0, "year") == 1) { echo "The value of the field year is null. "; } if (pg_field_is_null($res, 0, "year") == 0) { echo "The value of the field year is not null. "; } } ?> PHP Documentation Group PG_FIELD_IS_NULL(3)
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