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Ruby script to compute definite integral by trapizoidal rule.
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#! /usr/local/bin/ruby | |
#********************************************* | |
# 台形則による定積分 | |
#********************************************* | |
class DefiniteIntegralTrapzoid | |
# 積分区間分割数 | |
M = 100 | |
def initialize | |
# 被積分関数 | |
@f = lambda { |x| Math.sqrt(4 - x * x) } | |
end | |
# 定積分計算 | |
def generate_integral(a, b) | |
# 1区間の幅 | |
h = (b - a) / M | |
# 初期化 | |
x = a # X 値を a で初期化 | |
s = 0 # 面積初期化 | |
# 計算 | |
1.upto(M - 1) do |k| | |
x += + h | |
s += @f.call(x) | |
end | |
s = h * ((@f.call(a) + @f.call(b)) / 2 + s) | |
# 結果表示 | |
printf(" /%f\n", b); | |
printf(" | f(x)dx = %f\n", s); | |
printf(" /%f\n", a); | |
end | |
end | |
if __FILE__ == $0 | |
begin | |
# データ入力 | |
print "積分区間 A :" | |
a = gets.chomp.to_f | |
print " B :" | |
b = gets.chomp.to_f | |
exit if a == 0 && b == 0 | |
# 計算クラスインスタンス化 | |
obj = DefiniteIntegralTrapzoid.new | |
# 定積分計算 | |
obj.generate_integral(a, b) | |
rescue => e | |
$stderr.puts "[例外発生] #{e}" | |
end | |
end |
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