machine precision in plot

*To*: mathgroup at smc.vnet.net*Subject*: [mg65745] machine precision in plot*From*: Joerg Schaber <schaber at molgen.mpg.de>*Date*: Sun, 16 Apr 2006 03:49:23 -0400 (EDT)*Sender*: owner-wri-mathgroup at wolfram.com

[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