function Vector::count in Recommender API 7.6

Same name and namespace in other branches

1. 6.2 Matrix.php \Vector::count()

Count the number of vectors. This works for SparseVector too. It only counts valid numbers, not the size the vector is supposed to be.

Parameters

$may_cache:

Return value

the count number

3 calls to Vector::count()

Vector::covariance in classes/Matrix.php

Compute covariance with $vector. No caching option. Works for RealVector. SparseVector needs additional handling.

Vector::mean in classes/Matrix.php

Calculate the mean. This works for SparseMatrix too.

Vector::variance in classes/Matrix.php

Calculate the variance. This works for SparseMatrix too.

File

classes/Matrix.php, line 193

Class

Vector

This is the Vector superclass. @author danithaca

Code

function count($may_cache = FALSE) {
  if (!$may_cache || $this->count === NULL) {

    // triggers counting
    $this->count = count($this->values);
  }
  return $this->count;
}