Function accum_sdata_values_double

methods/svec/src/pg_gp/SparseData.c:974–989

This function is introduced to capture a common routine for * traversing a SparseData, transforming each element as we go along and * summing up the transformed elements. The method is non-destructive to * the input SparseData. */

 * the input SparseData.
 */
double
accum_sdata_values_double(SparseData sdata, double (*func)(double))
{
	double accum=0.;
	char *ix = sdata->index->data;
	double *vals = (double *)sdata->vals->data;
	int64 run_length;

	for (int i=0;i<sdata->unique_value_count;i++)
	{
		run_length = compword_to_int8(ix);
		accum += func(vals[i])*run_length;
		ix+=int8compstoragesize(ix);
	}
	return (accum);
}

/* Computes the running sum of the elements of a SparseData */
double sum_sdata_values_double(SparseData sdata) {