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MathGroup Archive 1998

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Re: Why doesn't this work ?



Andreas Keese wrote:
> 
> Look at this:
> 
> This works:
>   Clear[S1];
>   S1=Sin[x];
>   Plot[S1, {x, 0, 3}]
> 
> But why doesn't it work with more than one functions ?
> 
>   Clear[S2];
>   S2={Sin[x],Cos[x]};
>   Plot[S2, {x, 0, Pi}]
> 
> gives an error - Mathematica complains that S2 is not a machine-size

The reason it doesn't work is due to the process by which mathematica
evaluates its functions.  You need to take manual control of this
process by use of Hold, Evaluate, ReleaseHold etc.  The following
example plots your functions:

Clear[S2];
  S2={Hold[Sin[x]],Hold[Cos[x]]};
  Plot[Evaluate[ReleaseHold[S2]], {x, 0, Pi}]

Check out section 2.5.5 in the mathematica book.  Hope this helps. -- 
Remove the _nospam_ in the return address to respond.



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