Vectorization operations on matrices

Functions
vector	lower_ele (matrix mat, int K)

Detailed Description

 
vector lower_ele(matrix mat, int K) {
  int N = rows(mat);
  vector[K] out;
  
  int count = N;
  int pos = 1;
  
  for (k in 1 : K - 1) {
    count -= 1;
    out[pos : pos + count - 1] = sub_col(mat, k + 1, k, count);
    pos += count;
  }
  
  return out;
}

Function Documentation

lower_ele()

vector lower_ele	(	matrix	mat,
		int	K
	)

Lower triangular elements

Copyright 2021, Sean Pinkney

Parameters

mat	Matrix
K	Int if mat is size N x N then K is N * N / 2
vector	of lower triangular elements