[erlang-questions] Question on Diagraph module

Søren Hilmer <>
Tue Jan 29 11:33:45 CET 2008


Well I do not think that is the problem Balu is facing. Just tried his
example (same result btw).
And doing a G. after the badarith, still shows G, and the shell is fine.

--Søren

-- 
Søren Hilmer, M.Sc., M.Crypt.
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On Tue, January 29, 2008 09:52, Bengt Kleberg wrote:
> Greeteings,
>
> Presumably you are getting the error because G is gone.
>
> I have never used digraphs but the manual page
> (http://erlang.org/doc/man/digraph.html) says:
>
> "The digraph will, however, be deleted if the process that created the
> digraph terminates."
>
> Your shell process, that created G, has just crashed.
>
>
> bengt
>
> On Tue, 2008-01-29 at 08:16 +0000, Balu Balasubramanian wrote:
>> Hi,
>>
>> I am new to Erlang!
>>
>> Can some one explain why I am getting the last error message (badarith)
>> that I get with digraph module in stdlib.
>>
>> Erlang (BEAM) emulator version 5.5.4 [source] [64-bit] [async-threads:0]
>> [kernel -poll:false]
>>
>> Eshell V5.5.4  (abort with ^G)
>> 1> G=digraph:new().
>> {graph,14,15,16,true}
>> 2> digraph:info(G).
>> [{cyclicity,cyclic},{memory,847},{protection,protected}]
>> 3> digraph:info().
>>
>> =ERROR REPORT==== 8-Jan-2008::22:02:06 ===
>> Error in process  with exit value: {undef,[{digraph,info,[]},{erl_eval,d
>> o_apply,5},{shell,exprs,6},{shell,eval_loop,3}]}
>>
>> ** exited: {undef,[{digraph,info,[]},
>>                    {erl_eval,do_apply,5},
>>                    {shell,exprs,6},
>>                    {shell,eval_loop,3}]} **
>>
>> % the above error is obvious as digraph:info/0 is udnefined. But now,
>>
>> 4> digraph:info(G).
>>
>> =ERROR REPORT==== 8-Jan-2008::22:02:08 ===
>> Error in process  with exit value: {badarith,[{digraph,info,1},{erl_eval
>> ,do_apply,5},{shell,exprs,6},{shell,eval_loop,3}]}
>>
>> ** exited: {badarith,[{digraph,info,1},
>>                       {erl_eval,do_apply,5},
>>                       {shell,exprs,6},
>>                       {shell,eval_loop,3}]} **
>>
>> % Can some one please explain the above badarith error? Are there known
>> issues with the digraph module?
>>
>> 5> init:script_id().
>> {"OTP  APN 181 01","R11B"}
>> 6>
>>
>>
>> Thanks
>> Balu
>>
>>
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