columnVector method

Vector columnVector(
  1. int column
)

Returns a column from the matrix as a vector.

This function returns a new vector that never shares its storage with the source matrix.

Example

Matrix m = Matrix([
  [1.0, 2.0, 3.0, 1.0],
  [4.0, 5.0, 6.0, 2.0],
  [7.0, 8.0, 9.0, 3.0],
]);

print( m.columnVector(0) )

prints 1.0, 4.0, 7.0

Implementation

Vector columnVector(int column) {
  if (column < 0 || column >= this.n) {
    throw MatrixInvalidDimensions();
  }
  Vector vector = Vector.fillColumn(this.m);
  for (int i = 0; i < this.m; i++) {
    vector[i] = this[i][column];
  }
  return vector;
}