Re: [Maxima-discuss] How to use a graphviz program in the draw_graph function

[Hans-Peter V. <vie...@t-...>]

Thank you very much for the very fast and helpful answer. After setting 
the path in the windows environment, the error message vanished and I 
found the in.txt and out.txt files in the working directory. Sorry for 
just copying the german error message in my e-mail. Next time I will 
swith to english before asking.

Hans-Peter


Am 24.06.2017 um 11:02 schrieb Gunter Königsmann:
>> One remark: against localization of programs. With localization, when
>> an error message appears, it is localized, and thus impossible to
>> understand precisely for someone who doesn't speak the language. For an
>> open source software this limits the number of people who can help.
>> English is "lingua franca" for scientific stuff, and allows everyone to
>> collaborate.
>>
>> Second: the error at line 166 of draw_graph.mac is not directly related
>> to dot. The line says
>> dimension : length(second(first(v_pos)))
>> which is coherent with
>> first: empty argument
>> in other words v_pos is undefined when first is called. But just before
>> one has
>> v_pos : apply(program, [G]),
>> set_positions(v_pos, G)),
>> I don't know what is set_positions, it is not defined in the file.
>>
>> Anyways probably your maxima cannot find the dot program. It is called
>> this way:
>> if program = 'dot then
>>      command : concat("dot -Tplain \"",
>>        gp_file_in, "\" > \"", gp_file_out, "\"")
>> ...
>> system(command),
>>
> Translations of error messages are both very helpful and a complete
> nuisance.
>
> In this case you were correct: The path to dot.exe wasn't in the windows
> installation's PATH environment variable so windows had no idea where to
> find this binary.
>
> Kind regards,
>
>   Gunter.
>
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-- 
Mit freundlichen Grüßen

Dr.Hans-Peter Vietze
Zillering 47
64546 Mörfelden-Walldorf
vie...@t-...