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author | marcandre <marcandre@b2dd03c8-39d4-4d8f-98ff-823fe69b080e> | 2011-06-29 01:13:22 +0000 |
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committer | marcandre <marcandre@b2dd03c8-39d4-4d8f-98ff-823fe69b080e> | 2011-06-29 01:13:22 +0000 |
commit | 54bbc098fa1e05570e960750bf2c86d45017e575 (patch) | |
tree | 2c10d54b1e3b477341ee99bbf57b5669c3714fac /lib | |
parent | de97e946f04dd0374d6f2580c97591bc1fdc1f3f (diff) | |
download | ruby-54bbc098fa1e05570e960750bf2c86d45017e575.tar.gz |
* lib/matrix.rb: Matrix.zero can build rectangular matrices.
Vector#r should be called #magnitude
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@32280 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
Diffstat (limited to 'lib')
-rw-r--r-- | lib/matrix.rb | 10 |
1 files changed, 6 insertions, 4 deletions
diff --git a/lib/matrix.rb b/lib/matrix.rb index 02c157801d..3242cde9b2 100644 --- a/lib/matrix.rb +++ b/lib/matrix.rb @@ -229,13 +229,14 @@ class Matrix end # - # Creates an +n+ by +n+ zero matrix. + # Creates a zero matrix. # Matrix.zero(2) # => 0 0 # 0 0 # - def Matrix.zero(n) - Matrix.scalar(n, 0) + def Matrix.zero(row_size, column_size = row_size) + rows = Array.new(row_size){Array.new(column_size, 0)} + new rows, column_size end # @@ -1723,9 +1724,10 @@ class Vector # Returns the modulus (Pythagorean distance) of the vector. # Vector[5,8,2].r => 9.643650761 # - def r + def magnitude Math.sqrt(@elements.inject(0) {|v, e| v + e*e}) end + alias r magnitude #-- # CONVERTING |