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[MUG] Re: same function with different arrangement give different
plots?
| [MUG] Re: same function with different arrangement give different
plots? |
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Author: Koch-Beuttenmueller
Posted: Thu, 28 Nov 2002 08:52:23 +0100
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>> From: Koch-Beuttenmueller "Heike.Koch-Beuttenmueller"
> >> From: Xiaoyan Li "xili"
> I am trying to figure out why some plotting is not consistent with their
> theoretical shape. And I found out the same function with different
> arrangement actually give different plot in maple, has anyone find out why
> this is the case?
>
> For example, function tmpF1(x) and tmpF2(x) are exactly the same, but the
> plot diverge at around x=11.
>
> tmpF1 :=
> x->1.543471697*(exp(.3296799540*x^2)*erf(.5741776328*x)-exp(.3296799540*x^2)*erf(1.148355266*x))+x;
>
> tmpF2 :=
> x->1.543471697*exp(.3296799540*x^2)*(erf(.5741776328*x)-erf(1.148355266*x))+x;
>
> plot({tmpF1(x),tmpF2(x)},x=0..40);
>
> Originally I thought the x got ignored because of the intermediate
> result is too large. But actually by just change the last bit
> of the coefficient of tmpF1, it almost comply with tmpF3. This seems too
> strange.
>
> tmpF3 :=
> x->1.543471698*(exp(.3296799540*x^2)*erf(.5741776328*x)-exp(.3296799540*x^2)*erf(1.148355266*x))+x;
>
> plot({tmpF1(x),tmpF2(x)},x=0..40);
On Unix-platforms I get for MapleV R5.1, maple6, maple7 and maple8 no
differences in the plots of the 3 functions. Which Maple and which
platform do you use.
Mit freundlichen Gruessen
Heike Koch-Beuttenmueller
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