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Digit precision with N command when working with machine precision numbers

Daniel Solis, UPIIZ - IPN
Posted 11 years ago

I have something like this:

N[Mean[{3.81913, 243.354}], 3]

It outputs

123.587

because the mean of that list is a Machine Precision number and then, N[ ] does nothing. How can I force Mathematica to show the number of digits I want in a case like this one?
POSTED BY: Daniel Solis
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Thanks!, both options worked.
POSTED BY: Daniel Solis

SetPrecision[...,3] should do this.
POSTED BY: Daniel Lichtblau

Possibly 

N[Mean[Rationalize@{3.81913, 243.354}], 3]

is one way to go.... when you are working with machine precision numbers then machine precision arithmetic is used throughout the calculation.
POSTED BY: David Reiss
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