diff options
Diffstat (limited to 'lib/matrix.rb')
| -rw-r--r-- | lib/matrix.rb | 10 |
1 files changed, 7 insertions, 3 deletions
diff --git a/lib/matrix.rb b/lib/matrix.rb index 5cc9697714..7639b1de6d 100644 --- a/lib/matrix.rb +++ b/lib/matrix.rb @@ -2080,7 +2080,7 @@ class Vector end # - # Returns an angle with another vector. Result is within the [0...Math::PI]. + # Returns an angle with another vector. Result is within the [0..Math::PI]. # Vector[1,0].angle_with(Vector[0,1]) # # => Math::PI / 2 # @@ -2089,8 +2089,12 @@ class Vector Vector.Raise ErrDimensionMismatch if size != v.size prod = magnitude * v.magnitude raise ZeroVectorError, "Can't get angle of zero vector" if prod == 0 - - Math.acos( inner_product(v) / prod ) + dot = inner_product(v) + if dot.abs >= prod + dot.positive? ? 0 : Math::PI + else + Math.acos(dot / prod) + end end #-- |