RE: Problem with Precision?
- To: mathgroup at smc.vnet.net
- Subject: [mg34464] RE: [mg34447] Problem with Precision?
- From: "DrBob" <majort at cox-internet.com>
- Date: Wed, 22 May 2002 02:46:46 -0400 (EDT)
- Reply-to: <drbob at bigfoot.com>
- Sender: owner-wri-mathgroup at wolfram.com
"Why" is easy: why not?
N affects calculations involved in evaluating its first argument. It
doesn't change the number if the expression is already a number (even if
you try to DECREASE the number of digits). You don't want to change the
number anyway; you want to control its display.
For instance, evaluate the following:
x = 1.602176462
NumberForm[1.602176462, 10]
forms = {ScientificForm, EngineeringForm, AccountingForm, BaseForm,
PaddedForm}
TableForm[#[10000Pi x, 10] & /@ forms, TableHeadings -> {forms}]
Or, just for grins:
TableForm[#[BaseForm[10000Pi x, 7], 10] & /@ forms, TableHeadings ->
{forms}]
Isn't that fun?
Bobby Treat
-----Original Message-----
From: Mike [mailto:M.P.Croucher at sheffield.ac.uk]
To: mathgroup at smc.vnet.net
Subject: [mg34464] [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