Re: Problem with Precision?
- To: mathgroup at smc.vnet.net
- Subject: [mg34457] Re: [mg34447] Problem with Precision?
- From: "Michael Math" <michael-math at science.edu>
- Date: Wed, 22 May 2002 02:46:26 -0400 (EDT)
- References: <200205210736.DAA16509@smc.vnet.net>
- Sender: owner-wri-mathgroup at wolfram.com
If you specify the precision of the number and request more a lot more digits it works, e.g. N[1.602176462`10,50] produces the desired result, although I am not sure why requesting "only" 10 digits of precision yields less than that. Producing the desired result: 1.602176462`10 N[1.602176462`10,50] Not producing the desired result: N[1.602176462,10], N[1.602176462`10,10], N[1.602176462,50] The problem is that you can't always specify the precision of the number. For example, I have the same problem with Pi: In:= N[Pi,10] Out:= 3.14159 In:= N[Pi,50] Out:= 3.14159265358979... A statement in the document for N may hold the clue: "N[expr] gives a machine-precision number, so long as its magnitude is between $MinMachineNumber and $MaxMachineNumber." Michael ----- Original Message ----- From: "Mike" <M.P.Croucher at sheffield.ac.uk> To: mathgroup at smc.vnet.net Subject: [mg34457] [mg34447] Problem with Precision? > Can anyone shed any light on why > > N[1.602176462,10] > > gives > > 1.60218 > > I need it to be as accurate as I can get it and 5 dp doesn't cut it. Any ideas? > > Thanks > > Mike > >
- References:
- Problem with Precision?
- From: M.P.Croucher@sheffield.ac.uk (Mike)
- Problem with Precision?