From 56114d99ce650c6e797a74c464e1b91ef6c04c71 Mon Sep 17 00:00:00 2001
From: Arkadiusz Kondas <arkadiusz.kondas@gmail.com>
Date: Mon, 2 May 2016 23:06:17 +0200
Subject: [PATCH] fix param casting for hhvm compatibility

---
 src/Phpml/Clustering/KMeans/Point.php          | 2 +-
 src/Phpml/Math/Distance/Euclidean.php          | 2 +-
 src/Phpml/Math/Matrix.php                      | 4 ++--
 src/Phpml/Math/Statistic/Correlation.php       | 2 +-
 src/Phpml/Math/Statistic/StandardDeviation.php | 2 +-
 5 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/src/Phpml/Clustering/KMeans/Point.php b/src/Phpml/Clustering/KMeans/Point.php
index 9ff4b45..eb5bb78 100644
--- a/src/Phpml/Clustering/KMeans/Point.php
+++ b/src/Phpml/Clustering/KMeans/Point.php
@@ -49,7 +49,7 @@ class Point implements ArrayAccess
             $distance  += $difference * $difference;
         }
 
-        return $precise ? sqrt($distance) : $distance;
+        return $precise ? sqrt((float)$distance) : $distance;
     }
 
     /**
diff --git a/src/Phpml/Math/Distance/Euclidean.php b/src/Phpml/Math/Distance/Euclidean.php
index cca8f2b..1b6083b 100644
--- a/src/Phpml/Math/Distance/Euclidean.php
+++ b/src/Phpml/Math/Distance/Euclidean.php
@@ -30,6 +30,6 @@ class Euclidean implements Distance
             $distance += pow($a[$i] - $b[$i], 2);
         }
 
-        return sqrt($distance);
+        return sqrt((float)$distance);
     }
 }
diff --git a/src/Phpml/Math/Matrix.php b/src/Phpml/Math/Matrix.php
index 7c04119..d15629a 100644
--- a/src/Phpml/Math/Matrix.php
+++ b/src/Phpml/Math/Matrix.php
@@ -147,7 +147,7 @@ class Matrix
             for ($j = 0; $j < $this->columns; ++$j) {
                 $subMatrix = $this->crossOut(0, $j);
                 $minor = $this->matrix[0][$j] * $subMatrix->getDeterminant();
-                $determinant += fmod($j, 2) == 0 ? $minor : -$minor;
+                $determinant += fmod((float)$j, 2.0) == 0 ? $minor : -$minor;
             }
         }
 
@@ -236,7 +236,7 @@ class Matrix
         for ($i = 0; $i < $this->rows; ++$i) {
             for ($j = 0; $j < $this->columns; ++$j) {
                 $minor = $this->crossOut($i, $j)->getDeterminant();
-                $newMatrix[$i][$j] = fmod($i + $j, 2) == 0 ? $minor : -$minor;
+                $newMatrix[$i][$j] = fmod((float)($i + $j), 2.0) == 0 ? $minor : -$minor;
             }
         }
 
diff --git a/src/Phpml/Math/Statistic/Correlation.php b/src/Phpml/Math/Statistic/Correlation.php
index 1d2e8ac..842008c 100644
--- a/src/Phpml/Math/Statistic/Correlation.php
+++ b/src/Phpml/Math/Statistic/Correlation.php
@@ -38,7 +38,7 @@ class Correlation
             $b2 = $b2 + pow($b, 2);
         }
 
-        $corr = $axb / sqrt($a2 * $b2);
+        $corr = $axb / sqrt((float)($a2 * $b2));
 
         return $corr;
     }
diff --git a/src/Phpml/Math/Statistic/StandardDeviation.php b/src/Phpml/Math/Statistic/StandardDeviation.php
index 2b03c54..8ecb234 100644
--- a/src/Phpml/Math/Statistic/StandardDeviation.php
+++ b/src/Phpml/Math/Statistic/StandardDeviation.php
@@ -39,6 +39,6 @@ class StandardDeviation
             --$n;
         }
 
-        return sqrt($carry / $n);
+        return sqrt((float)($carry / $n));
     }
 }