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Re: Precision of AiryAi[0.0]

• To: mathgroup at smc.vnet.net
• Subject: [mg103519] Re: Precision of AiryAi[0.0]
• From: Harutyun Amirjanyan <amirjanyan at gmail.com>
• Date: Sat, 26 Sep 2009 06:13:14 -0400 (EDT)
• References: <200909241149.HAA29080@smc.vnet.net> <h9i44n$98i$1@smc.vnet.net>

this looks like a bug
and it's the same in versions 5,6,7

setting every time Precision to MachinePrecision can help
In[1]:= AiryAi1[x_?NumberQ] :=
 SetPrecision[AiryAi[x], MachinePrecision]

In[2]:= ClearSystemCache[]
Precision@Nest[AiryAi1, 0.0, 100] // Timing

Out[3]= {0., MachinePrecision}

In[4]:= ClearSystemCache[]
Precision@Nest[AiryAi, 0.0, 100] // Timing

Out[5]= {0.687, 225.079}

• References:
  • Re: Precision of AiryAi[0.0]
    • From: Bill Rowe <readnews@sbcglobal.net>