Re: Precision of AiryAi[0.0]
- To: mathgroup at smc.vnet.net
- Subject: [mg103479] Re: Precision of AiryAi[0.0]
- From: Bill Rowe <readnews at sbcglobal.net>
- Date: Thu, 24 Sep 2009 07:49:32 -0400 (EDT)
On 9/23/09 at 7:25 AM, mcmcclur at unca.edu (Mark McClure) wrote:
>Running V7.0.1 on my 64 bit MacBook Pro.
>The result of the simple computation AiryAi[0.0] returns a result
>with a precision of 15.9, rather than the expected MachinePrecision.
>That is, we get:
>Precision[AiryAi[0.0]] 15.9546
>Rather than MachinePrecision as in
>Precision[BesselJ[2, 0.0]] MachinePrecision
>Does anyone have an explanation for this?
Notice
In[1]:= {Precision[AiryAi[0.0]],
Precision[AiryAi[0.0]] == $MachinePrecision}
Out[1]= {15.9546,True}
In[2]:= $Version
Out[2]= 7.0 for Mac OS X x86 (64-bit) (February 19, 2009)
So, why I do not know why this particular function returns the
numeric value for machine precision rather than simply returning
MachinePrecision, it is clear that this function is returning a
machine precision number when given a machine precision number
as an input.
- Follow-Ups:
- Re: Re: Precision of AiryAi[0.0]
- From: Andrzej Kozlowski <akoz@mimuw.edu.pl>
- Re: Re: Precision of AiryAi[0.0]
- From: Mark McClure <mcmcclur@unca.edu>
- Re: Re: Precision of AiryAi[0.0]