[erlang-questions] apply/2

Bob Ippolito <>
Fri Jul 27 19:16:52 CEST 2007


apply/2 takes a fun, not the name of the function (an atom)... to use
apply/2 you'd do this:

apply(fun erlang:round/1, [2.3]).

apply/3 takes the name of the module, the name of the function (both
atoms), and the arguments as demonstrated.

-bob

On 7/27/07, David Mercer <> wrote:
> Fun round is in the erlang module.  This should work:
>
> > apply(erlang, round, [2.3]).
>
> Cheers,
>
> David
>
> -----Original Message-----
> From: 
> [mailto:] On Behalf Of Henrique Ferreiro
> Sent: Friday, July 27, 2007 11:42
> To: 
> Subject: [erlang-questions] apply/2
>
> Hello,
>
> I noticed some extrange behaviour that this list surely can explain:
>
> 1> round(2.3).
> 2
> 2> apply(round, [2.3]).
>
> =ERROR REPORT==== 27-Jul-2007::18:40:22 ===
> Error in process <0.31.0> with exit value:
> {{badfun,round},[{erl_eval,do_apply,5},{shell,exprs,6},{shell,eval_loop,3}]}
>
> ** exited: {{badfun,round},
>             [{erl_eval,do_apply,5},{shell,exprs,6},{shell,eval_loop,3}]}
> **
>
> Thanks in advance,
> Henrique Ferreiro
>
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