diff options
author | usa <usa@b2dd03c8-39d4-4d8f-98ff-823fe69b080e> | 2013-05-14 11:39:21 +0000 |
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committer | usa <usa@b2dd03c8-39d4-4d8f-98ff-823fe69b080e> | 2013-05-14 11:39:21 +0000 |
commit | e76eb06feb024828034379797129d92522e28516 (patch) | |
tree | 1326c625c233ba2554043203a7697f5e3d4c49e5 /ruby_1_9_3/benchmark/bm_so_spectralnorm.rb | |
parent | aa6e98139c8e1ea442fb2182341aaa08ff55b529 (diff) | |
parent | bede15ac5e701ed08f3fc64c2dba03d3f393c652 (diff) |
add tag v1_9_3_426v1_9_3_426
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/tags/v1_9_3_426@40737 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
Diffstat (limited to 'ruby_1_9_3/benchmark/bm_so_spectralnorm.rb')
-rw-r--r-- | ruby_1_9_3/benchmark/bm_so_spectralnorm.rb | 50 |
1 files changed, 0 insertions, 50 deletions
diff --git a/ruby_1_9_3/benchmark/bm_so_spectralnorm.rb b/ruby_1_9_3/benchmark/bm_so_spectralnorm.rb deleted file mode 100644 index 6b97206689..0000000000 --- a/ruby_1_9_3/benchmark/bm_so_spectralnorm.rb +++ /dev/null @@ -1,50 +0,0 @@ -# The Computer Language Shootout -# http://shootout.alioth.debian.org/ -# Contributed by Sokolov Yura - -def eval_A(i,j) - return 1.0/((i+j)*(i+j+1)/2+i+1) -end - -def eval_A_times_u(u) - v, i = nil, nil - (0..u.length-1).collect { |i| - v = 0 - for j in 0..u.length-1 - v += eval_A(i,j)*u[j] - end - v - } -end - -def eval_At_times_u(u) - v, i = nil, nil - (0..u.length-1).collect{|i| - v = 0 - for j in 0..u.length-1 - v += eval_A(j,i)*u[j] - end - v - } -end - -def eval_AtA_times_u(u) - return eval_At_times_u(eval_A_times_u(u)) -end - -n = 500 # ARGV[0].to_i - -u=[1]*n -for i in 1..10 - v=eval_AtA_times_u(u) - u=eval_AtA_times_u(v) -end -vBv=0 -vv=0 -for i in 0..n-1 - vBv += u[i]*v[i] - vv += v[i]*v[i] -end - -str = "%0.9f" % (Math.sqrt(vBv/vv)), "\n" -# print str |