//Brief: QR decomposition
void qrdec(mat *A, mat* R){
double proj = 0;
double norm = 0;
// Allocates pointers of type *vec
//vec *coli = (vec*)malloc(sizeof(vec));
//vec *colj = (vec*)malloc(sizeof(vec));
vec* coli = vec_new(A->row);
vec* colj = vec_new(A->row);
for(int i=0; i<A->col; i++){
mat_get_col(coli, A, i);
norm = vec_norm(coli);
mat_set(R, i, i, norm);
vec_scale(coli, 1.0/norm);
mat_set_col(A, coli, i);
for(int j=i+1; j<A->col; j++){
mat_get_col(colj, A, j);
proj = vec_dot(coli,colj);
vec_add(colj,coli,-proj);
mat_set_col(A, colj, j);
mat_set(R, i, j, proj);
}
}
// Free pointers
vec_free(coli);
vec_free(colj);
}
mat_t *mat_set_view(vec_t eye, vec_t u, vec_t v, vec_t w, mat_t *a){
mat_t *b = mat_set_trans(vec_neg(eye),mat_new_zero());
mat_set_row(0,u,a);
mat_set_row(1,v,a);
mat_set_row(2,w,a);
mat_set_row(3,vec_new(0,0,0,1),a);
mat_set_col(3,vec_new(0,0,0,1),a);
mat_mult(a,b);
mat_free(b);
return a;
}
mat make_Y(uint Nv, uint Ns, uint Nc, mat U, double wcr)
{
uint i;
mat Y = mat_new(Nv,Ns);
it_randomize();
for (i=0; i < Ns; i++) {
vec x, y, w;
bvec m;
x = make_x( Nv );
m = make_m( Nc );
w = make_w( U, m );
y = make_y( x, w, wcr );
mat_set_col(Y,i,y);
vec_delete( x );
vec_delete( w );
vec_delete( y );
bvec_delete( m );
}
return Y;
}
