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diffrence between ver 3.01 and 4.1 regarding N[]?
*To*: mathgroup at smc.vnet.net
*Subject*: [mg39177] diffrence between ver 3.01 and 4.1 regarding N[]?
*From*: peter weijnitz <pewei at algonet.se>
*Date*: Sun, 2 Feb 2003 01:13:35 -0500 (EST)
*Organization*: Telenordia/Algonet
*Sender*: owner-wri-mathgroup at wolfram.com
I tried some of my Mathematica3.01 programs on a computer with
Mathematica4.1,
there where some differences that I could not explain.
Regarding N[]: consider for example:
with version 4.1 I got:
N[Sqrt[2.],16]->1.4142
and
N[Sqrt[2.],17]->1.4142135623730950
and in version 3.01:
N[Sqrt[2.],16]->1.414213562373095
and
N[Sqrt[2.],17]->1.4142135623730950
Using SetPrecision[Sqrt[2.],16] I could make Mathematica4.1 give me 16
digits precision.
Ideas?
Peter W
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