Rename SVD->isStandardBasisVector

to getStandardBasisIndex

src/LinearAlgebra/Decomposition/SVD.php

@@ -215,7 +215,7 @@ private static function diagonalize(NumericMatrix $S): array
  foreach ($vectors as $i => $vector)
  {
  // Each column should contain 1 non-zero element
- $j = self::isStandardBasisVector($vector);
+ $j = self::getStandardBasisIndex($vector);
 
  if ($j === -1) {
  throw new MatrixException("S Matrix in SVD is not orthogonal:\n" . (string) $S);
@@ -259,15 +259,15 @@ private static function diagonalize(NumericMatrix $S): array
  }
 
  /**
- * Checks that a vector has a single non-zero entry
+ * Checks that a vector has a single non-zero entry and returns its index
  * 
  * @param Vector $v
  * 
  * @return int The index of the non-zero entry or -1 if either:
  * 1. There are multiple non-zero entries
  * 2. The vector is a zero vector 
  */
- private static function isStandardBasisVector(Vector $v): int
+ private static function getStandardBasisIndex(Vector $v): int
  {
  if ($v->l2Norm() === 0) {
  return false;
@@ -281,7 +281,7 @@ private static function isStandardBasisVector(Vector $v): int
  if (!Arithmetic::almostEqual($component, 0)) {
  if ($index === -1) {
  $index = $i;
- } else { // If we already found a non-zero component, then return false
+ } else { // If we already found a non-zero component, then return -1
  return -1;
  }
  }