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Re: Just for fun: Shortest InputForm to achieve a given Kernel error

  • To: mathgroup at smc.vnet.net
  • Subject: [mg82135] Re: Just for fun: Shortest InputForm to achieve a given Kernel error
  • From: Szabolcs HorvÃt <szhorvat at gmail.com>
  • Date: Sat, 13 Oct 2007 03:46:45 -0400 (EDT)
  • References: <200710100821.EAA26453@smc.vnet.net> <fen7h2$5ju$1@smc.vnet.net>

Two more solutions:

å??æ­£å?? wrote:
> I have found 2 answers after some try.
> 
> For General::ovfl: 9^99!
> For $IterationLimit::itlim: #0@# &@1
> 
> On 10/10/07, Andrew Moylan <andrew.j.moylan at gmail.com> wrote:
>> "1/0" is a string of length 3 which, when interpreted as InputForm (in a
>> clean Kernel), generates a Power::infy error:
>>
>> ToExpression["1/0", InputForm];
>>>> Power::infy: Infinite expression 1/0 encountered.
>> I think this is the shortest string with this property.
>>
>> Here are some other errors and the lengths of the shortest strings I can
>> find to generate them:
>>
>> $RecursionLimit::reclim: Recursion depth of 256 exceeded.
>> Input length: 4

a=2a

>>
>> General::ovfl: Overflow occurred in computation.
>> Input length: 5
>>
>> (Kernel running out of memory)
>> Input length: 5
>>

a=a@a

>> General::unfl: Underflow occurred in computation.
>> Input length: 6
>>
>> $IterationLimit::itlim: Iteration limit of 4096 exceeded.
>> Input length: 7
>>
>> Can you figure out how to generate those errors with input strings of that
>> length? Can you find any *shorter* solutions?
>>

-- 
Szabolcs


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