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Diffstat (limited to 'ext/bigdecimal/lib/nlsolve.rb')
-rw-r--r-- | ext/bigdecimal/lib/nlsolve.rb | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/ext/bigdecimal/lib/nlsolve.rb b/ext/bigdecimal/lib/nlsolve.rb new file mode 100644 index 0000000000..08f17f9ecd --- /dev/null +++ b/ext/bigdecimal/lib/nlsolve.rb @@ -0,0 +1,38 @@ +#!/usr/local/bin/ruby + +# +# nlsolve.rb +# An example for solving nonlinear algebraic equation system. +# + +require "bigdecimal" +require "newton" +include Newton + +class Function + def initialize() + @zero = BigDecimal::new("0.0") + @one = BigDecimal::new("1.0") + @two = BigDecimal::new("2.0") + @ten = BigDecimal::new("10.0") + @eps = BigDecimal::new("1.0e-16") + end + def zero;@zero;end + def one ;@one ;end + def two ;@two ;end + def ten ;@ten ;end + def eps ;@eps ;end + def values(x) # <= defines functions solved + f = [] + f1 = x[0]*x[0] + x[1]*x[1] - @two # f1 = x**2 + y**2 - 2 => 0 + f2 = x[0] - x[1] # f2 = x - y => 0 + f <<= f1 + f <<= f2 + f + end +end + f = BigDecimal::limit(100) + f = Function.new + x = [f.zero,f.zero] # Initial values + n = nlsolve(f,x) + p x |