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Re: FullForm OK but StandardForm fails

  • To: mathgroup at smc.vnet.net
  • Subject: [mg88712] Re: [mg88687] FullForm OK but StandardForm fails
  • From: Carl Woll <carlw at wolfram.com>
  • Date: Tue, 13 May 2008 07:11:28 -0400 (EDT)
  • References: <200805121040.GAA23879@smc.vnet.net>

Fiona H Evans wrote:

>Hi all,
>
>I'm wondering if this is a bug in 6.0.2.0 or whether anyone can see my
>problem here. I'm running a model that updates an object called 'data'
>using a module with the HoldFirst attribute. After I run the module, I
>can see the Head of data, and its FullForm, but when I try to view its
>StandardForm, I get a $RecursionLimit error as follows. If I try to
>Print data, the kernel crashes. However, if I copy the FullForm of
>data (Out[76]) into a new object, it Prints perfectly. Any ideas?
>  
>
This is the kind of behavior I sometimes see with badly written 
MakeBoxes rules. Are you using any such rules?

Carl Woll
Wolfram Research

>
>In[75]:= Head[data]
>
>Out[75]= localState
>
>In[76]:= FullForm[data]
>
>Out[76]//FullForm=
>localState[community[List[population["canola",genotypeInfo[],cohortList[List[]],cohortList[List[]],
>cohortList[List[]],cohortList[List[]]],population["lupin",genotypeInfo[],cohortList[List[]],cohortList[List[]],
>cohortList[List[]],cohortList[List[]]],population["ryegrass",genotypeInfo[List[Rule[List[1,1],
>0.9993453217507997`],Rule[List[Blank[Integer],Blank[Integer]],
>1]],List["major"],List["dominant"],
>List["glyphosate"],List[Rational[1,1000000000]],List[0.1`]],cohortList[List[cohort[time[3502828800],
>hashedMSet[ruleSet[List[Rule[List[List[1],List[1]],
>1],Rule[List[List[1],List[2]],2],Rule[List[List[2],
>List[1]],3],Rule[List[List[2],List[2]],
>4]]],List[499345536052604696,327124822795158,
>327124822795158,214301804988],List[info[List[]],info[List[]],info[List[]],info[List[]]]]]]],
>cohortList[List[]],cohortList[List[]],cohortList[List[]]],population["wheat",genotypeInfo[],
>cohortList[List[cohort[time[3502828800],hashedMSet[ruleSet[List[Rule[List[List[1],List[1]],
>1]]],
>List[160000000000000000],List[info[List[]]]]]]],cohortList[List[]],cohortList[List[]],cohortList[List[]]],
>population["wildradish",genotypeInfo[],cohortList[List[]],cohortList[List[]],cohortList[List[]],
>cohortList[List[]]]]],herbicideResidueList[]]
>
>In[77]:= StandardForm[data]
>
>During evaluation of In[77]:= $RecursionLimit::reclim: Recursion depth
>of 1024 exceeded. >>
>During evaluation of In[77]:= $RecursionLimit::reclim: Recursion depth
>of 1024 exceeded. >>
>During evaluation of In[77]:= $RecursionLimit::reclim: Recursion depth
>of 1024 exceeded. >>
>During evaluation of In[77]:= General::stop: Further output of
>$RecursionLimit::reclim will be suppressed during this calculation. >>
>
>
>  
>



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