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machine precision in plot


[This post has been delayed due to email problems - moderator]


Hi,

I have defined a function that takes as arguments small values and also 
returns small values:

In[237]:=
P1[7.5`*^-17]

Out[237]=
-2.1926`*^7

However, when plotting the function with
Plot[P1[x], {x, 5.85`*^-17, 7.15`*^-17}]
I get an error message:
Plot::"plld" Endpoints for x in {x, 5.85`*^-17, 7.15`*^-17} must have 
distinct machine-precision numerical values.

I thought Mathematica can handle such small numbers.
Any hint?

best,

joerg


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