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[MUG] same function with different arrangement give different plots?
| [MUG] same function with different arrangement give different plots? |
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Author: Xiaoyan Li
Posted: Tue, 26 Nov 2002 23:38:16 -0500
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>> From: Xiaoyan Li "xili"
Hello,
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);
Thanks,
Xiaoyan
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