Function floatvector_sub

vexdb_pg/src/floatvector.cpp:632–651

PG_FUNCTION_INFO_V1(floatvector_sub);
Datum floatvector_sub(PG_FUNCTION_ARGS)
{
    FloatVector *a = PG_GETARG_FLOATVECTOR_P(0);
    FloatVector *b = PG_GETARG_FLOATVECTOR_P(1);
    CheckDims(a, b);
    const float *ax = a->x;
    const float *bx = b->x;
    FloatVector *result = InitFloatVector(a->dim);
    float *rx = result->x;
    for (int16 i = 0, imax = a->dim; i < imax; ++i) {
        rx[i] = ax[i] - bx[i];
    }
    for (int16 i = 0, imax = a->dim; i < imax; ++i) {
        if (isinf(rx[i])) {
            float_overflow_error();
        }
    }

    PG_RETURN_POINTER(result);
}

/*
 * Subtract floatvectors without allocate new floatvector