summaryrefslogtreecommitdiff
path: root/benchmark/so_partial_sums.rb
diff options
context:
space:
mode:
authork0kubun <k0kubun@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>2018-07-10 13:08:40 (GMT)
committerk0kubun <k0kubun@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>2018-07-10 13:08:40 (GMT)
commit433af16167aec949c6345ad41b78b17c440b4a6d (patch)
tree42b9a14817cccef4a57177329381f97a7a2ac75c /benchmark/so_partial_sums.rb
parentf992f4251874a025de09ffecf0f2b8cb984f2201 (diff)
benchmark: drop all bm_ prefix for legacy driver.rb
benchmark/*.rb is only benchmarks now. We don't need prefixes. git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@63928 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
Diffstat (limited to 'benchmark/so_partial_sums.rb')
-rw-r--r--benchmark/so_partial_sums.rb31
1 files changed, 31 insertions, 0 deletions
diff --git a/benchmark/so_partial_sums.rb b/benchmark/so_partial_sums.rb
new file mode 100644
index 0000000..630b45c
--- /dev/null
+++ b/benchmark/so_partial_sums.rb
@@ -0,0 +1,31 @@
+n = 2_500_000 # (ARGV.shift || 1).to_i
+
+alt = 1.0 ; s0 = s1 = s2 = s3 = s4 = s5 = s6 = s7 = s8 = 0.0
+
+1.upto(n) do |d|
+ d = d.to_f ; d2 = d * d ; d3 = d2 * d ; ds = Math.sin(d) ; dc = Math.cos(d)
+
+ s0 += (2.0 / 3.0) ** (d - 1.0)
+ s1 += 1.0 / Math.sqrt(d)
+ s2 += 1.0 / (d * (d + 1.0))
+ s3 += 1.0 / (d3 * ds * ds)
+ s4 += 1.0 / (d3 * dc * dc)
+ s5 += 1.0 / d
+ s6 += 1.0 / d2
+ s7 += alt / d
+ s8 += alt / (2.0 * d - 1.0)
+
+ alt = -alt
+end
+
+if false
+ printf("%.9f\t(2/3)^k\n", s0)
+ printf("%.9f\tk^-0.5\n", s1)
+ printf("%.9f\t1/k(k+1)\n", s2)
+ printf("%.9f\tFlint Hills\n", s3)
+ printf("%.9f\tCookson Hills\n", s4)
+ printf("%.9f\tHarmonic\n", s5)
+ printf("%.9f\tRiemann Zeta\n", s6)
+ printf("%.9f\tAlternating Harmonic\n", s7)
+ printf("%.9f\tGregory\n", s8)
+end