MathGroup Archive: July 2012 [00386]

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Re: Putting a Test or Condition on the Right-Hand Side of a Function

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Subject: [mg127469] Re: Putting a Test or Condition on the Right-Hand Side of a Function
From: Sébastien Roy <roys3d at gmail.com>
Date: Fri, 27 Jul 2012 04:57:56 -0400 (EDT)
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Le jeudi 26 juillet 2012 03:38:36 UTC-4, Gregory Lypny a =E9crit :
> I have a simple function that displays the integer part of a real number if the fraction part is less than a millionth.
>
> 	dropDecimal[x_] := If[FractionalPart[x] &lt; .000001, IntegerPart[x], x]
>
> In trying to learn more about functional programming, I was wondering whether there is a way to put the condition or test on the right-hand side of the
> function.

You could define it this way:

drop[x_] := IntegerPart[x] /; FractionalPart[x] < 0.000001;
drop[x_] := x;

The first definition applies only if the test is true. The second "more general" definition will apply if no "less general" definition is applicable.

Sebastien

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