Monday, 17 August 2009

Playing with scala

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$ scala
Welcome to Scala version 2.7.3final (Java HotSpot(TM) 64-Bit Server VM, Java 1.6.0_14).
Type in expressions to have them evaluated.
Type :help for more information.

scala> def factorial (x:Double):Double = if (x == 0) 1 else x*factorial(x-1);
factorial: (Double)Double

scala> def exp(y:Double):Double = (0.0 /: 1.to(20).map (x => Math.pow(x,y)/factorial(x)))(_+_)
exp: (Double)Double

scala> exp(1);
res0: Double = 2.7182818284590455

scala>

Posted by james at 9:24 PM in Tools and Programming

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