Vector vector_perpendicular(Vector v)
{
int index = vector_min_index(v);
error_check(index == -1, "cannot make zero vector perpendicular");
Vector u = vector_dimension(index);
return vector_normalize(cross(v, u));
}
int toScalarR(int code, KDVEC(x), DVEC(r)) {
REQUIRES(rn==1,BAD_SIZE);
DEBUGMSG("toScalarR");
double res;
integer one = 1;
integer n = xn;
switch(code) {
case 0: { res = dnrm2_(&n,xp,&one); break; }
case 1: { res = dasum_(&n,xp,&one); break; }
case 2: { res = vector_max_index(V(x)); break; }
case 3: { res = vector_max(V(x)); break; }
case 4: { res = vector_min_index(V(x)); break; }
case 5: { res = vector_min(V(x)); break; }
default: ERROR(BAD_CODE);
}
rp[0] = res;
OK
}
