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Re: Debugging Mathematica Code (Mathematica 7)

  • To: mathgroup at smc.vnet.net
  • Subject: [mg95581] Re: Debugging Mathematica Code (Mathematica 7)
  • From: Jens-Peer Kuska <kuska at informatik.uni-leipzig.de>
  • Date: Thu, 22 Jan 2009 06:59:10 -0500 (EST)
  • Organization: Uni Leipzig
  • References: <gl1okn$dpb$1@smc.vnet.net> <gl4a7r$gi7$1@smc.vnet.net> <gl71ps$c1f$1@smc.vnet.net>
  • Reply-to: kuska at informatik.uni-leipzig.de

Hi,

I have never had such a problem but you should open the
debugger controls always before you send a
code piece to the kernel.

I really suggest the Wolfram Workbench debugger !
It works more like one would expect it
if one use a compiled language like C++.

Have a look at
http://www.wolfram.com/broadcast/screencasts/workbench/debugging/


BTW We have stopped to make bugs in
in the programs we wrote, because it turns
out not to be useful at all ;-)

Regards
   Jens

m.g. wrote:
> On 20 Jan., 12:57, Jens-Peer Kuska <ku... at informatik.uni-leipzig.de>
> wrote:
>> Hi,
>>
>> the Wolfram Workbench has an excellent debugger
>> and there are situations where you need it.
>>
>> BTW: What is so complicated ?
>> - go to the Evaluation Menu and open the Debugger
>> - now type into a notebook
>>
>> foo[0] = 1
>> foo[n_Integer] /; n > 0 := n*foo[n - 1]
>>
>> use the mouse and mark in
>> foo[n_Integer] /; n > 0 := n*foo[n - 1]
>> the "foo[n - 1]" expression.
>>
>> Go to the debugger window and use
>> "Break at selection" Now the "foo[n - 1]"
>> has a red frame.
>>
>> Finally go to the notebook window and enter
>>
>> foo[4]
>>
>> as an input. And ... ta ta ta
>> The Stack window show the stack
>> and all is as it should. Now press "Continue"
>> ind the debugger menu to see the next
>> step in the recursion ...
>>
>> Regards
>>    Jens
>>
>> magma wrote:
>>> No, there isn't a decent explanation.
>>> You can check prior posts by me and others on debugging, but this is
>>> the conclusion, basically.
>>> Anyway, the general feeling among knowledgeable users is that you do
>>> not really need a debugger.
>>> These users just sprinkle print statements here and there to see
>>> intermediate results.
>>> I additionally also use On[] and Off[] which help me see clearly the
>>> code flow.
>>> You don't really need much more.
>>> hth
>>> On Jan 19, 12:36 pm, "m.g." <m... at michaelgamer.de> wrote:
>>>> Hello Experts,
>>>>   I made my fist steps with the Mathematica (so called) debugger and=
>  st=
>>> umbled
>>>> immediately. Is there anywhrere a documentation of this tool that is
>>>> worth it's name (a criterion which the Mathematica 7 documentatin on d=
> ebu=
>>> g
>>>> surely fails). I've tried a lot, but I'm still at the stage "trial an
>>>> error".
>>>> Greetings
>>>> Mike
> 
> Hi Jens,
> 
>  thanks for the fast reply. I did exactly this what you described,
> but: Sometimes it works, sometimes not. I used "step" and "step in",
> to see waht the code does, but it seems that frequent swithceing
> breakpoint on and of "irritates" the debugger and it's behavior gets a
> bit, say, probabilisitc, and therefore I was looking for documentation
> (for it could be my fault in missusing the tool without knowing there
> is a missuse). So I returned to the insertion of Print-Statements.
> 
> But I would like more to have a debugger which works well - it's more
> easy and comfortable like the print-statement workaround.
> 
> Greetings
> 
> Mike
> 


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