diff options
| -rw-r--r-- | ChangeLog | 5 | ||||
| -rw-r--r-- | NEWS | 2 | ||||
| -rw-r--r-- | lib/matrix.rb | 10 |
3 files changed, 13 insertions, 4 deletions
@@ -1,3 +1,8 @@ +Wed Jun 29 10:13:12 2011 Marc-Andre Lafortune <ruby-core@marc-andre.ca> + + * lib/matrix.rb: Matrix.zero can build rectangular matrices. + Vector#r should be called #magnitude + Wed Jun 29 10:11:08 2011 Marc-Andre Lafortune <ruby-core@marc-andre.ca> * lib/matrix.rb: Add Matrix#diagonal?, hermitian?, normal?, @@ -168,10 +168,12 @@ with all sufficient information, see the ChangeLog file. * Matrix#unitary? * Matrix#upper_triangular? * Matrix#zero? + * Vector#magnitude * extended methods: * Matrix#each and #each_with_index can iterate on a subset of the elements * Matrix#find_index returns [row, column] and can iterate on a subset of the elements + * Matrix.zero can build rectangular matrices * net/http * SNI (Server Name Indication) supported for HTTPS. 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 |