MathGroup Archive 2010

[Date Index] [Thread Index] [Author Index]

Search the Archive

Re: Puzzled by IntegerPart


N can reduce precision but it cannot increase precision.

100*1.15 // InputForm

114.99999999999999

% // Precision

MachinePrecision

N[%%, 20] // InputForm

114.99999999999999

% // Precision

MachinePrecision

SetPrecision[100*1.15, 30]

114.999999999999985789145284798

Precision[%]

30.

N[%%, 20]

114.99999999999998579

Precision[%]

20.


Bob Hanlon

---- Themis Matsoukas <tmatsoukas at me.com> wrote: 

=============
Round and Rational have solved the problem. But I am curious, why do the phantom decimals not show with N?

N[100*1.15, 20]

115.


Themis




  • Prev by Date: Re: Replacement Rule with Sqrt in denominator
  • Next by Date: Construction of schedules for the inequality decision
  • Previous by thread: Re: Puzzled by IntegerPart
  • Next by thread: Re: Puzzled by IntegerPart