There are four separate methods called Math/abs, to handle the
following types: int, long, float, double. So when you use Math/abs on
a different Number type, it is not clear which of those methods it
should use.
The other examples you gave can only accept double. Maybe in that case
Clojure is automatically converting to double. It seems like it would
be an improvement if ratios had a preference order for what they could
be cast into, in which double is preferable to float is preferable to
long is preferable to int.
On the other hand, java.lang.Math should really only be used when you
want fast primitive operations. If you want better support for Clojure
numeric types, try clojure.contrib.math.
http://richhickey.github.com/clojure-contrib/math-api.html
On Sun, Nov 14, 2010 at 6:46 AM, Jarl Haggerty <fictivela...@gmail.com> wrote:
> Math/abs won't accept ratios, so I assumed the Java Math functions
> only took base number types but all the other methods I tried accept
> ratios just fine.
>
> user=> (Math/sin 1/2)
> 0.479425538604203
> user=> (Math/sqrt 1/2)
> 0.7071067811865476
> user=> (Math/pow 1/2 1/2)
> 0.7071067811865476
> user=> (Math/abs 1/2)
> IllegalArgumentException No matching method found: abs
> clojure.lang.Reflector.invokeMatchingMethod (Reflector.java:77)
>
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