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MathGroup Archive 1995

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Re: Table iterator bounds problem

  • To: mathgroup at christensen.cybernetics.net
  • Subject: [mg1721] Re: Table iterator bounds problem
  • From: Richard Mercer <richard at seuss.math.wright.edu>
  • Date: Fri, 21 Jul 1995 01:45:23 -0400

>  Hello,
>  

>  I get the following strange error with MMA 2.2 on Mac
>  and RS6000:
>  

>  In[4]:=  Table[Sin[x],{x, -Pi/2, Pi/2, Pi/10}]
>  

>                              Pi   Pi  Pi
> Table::iterb: Iterator {x, -(--), --, --} does not have appropriate bounds.
>                              2    2   10
>  

>  It's the increment that isn't liked, because without it
>  everything's fine:
>  

>  In[4]:=   Table[Sin[x],{x, -Pi/2, Pi/2}]
>  

>  Out[4]= {-1, -Cos[1], -Cos[2], -Cos[3]}
>  

>  

>  It happens after I load a package I wrote which doesn't
>  even use Iterators.  Can anybody think of what might be
>  going wrong? I don't particularly want to post the
>  contents of the long, badly-written package, I'll mail
>  it if anybody's interested.
>  

>  A few ideas about what might be causing the Iterator to
>  be redefined would be appreciated.

It's almost certainly the package that is causing your problem; 

I don't see it using version 2.2. 


This sort of thing is not unheard of; packages sometimes have side-effects.  
Especially "poorly-written" ones, though I have seen side-effects from Standard  
Packages also.

While the side effect can be traced, it's a nasty job that I'm not interested  
in any more than you. However a simple work-around might do the trick. Try

 Table[Sin[x],{x, -Pi/2, Pi/2, N[Pi/10]}]

and if that doesn't work, try

 Table[Sin[x],N[{x, -Pi/2, Pi/2, Pi/10}]]

Richard Mercer



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