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MathGroup Archive 1998

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warning for Round[Log[2]/Log[4]]

  • To: mathgroup at smc.vnet.net
  • Subject: [mg13909] warning for Round[Log[2]/Log[4]]
  • From: Wouter Meeussen <eu000949 at pophost.eunet.be>
  • Date: Sun, 6 Sep 1998 02:55:45 -0400
  • Sender: owner-wri-mathgroup at wolfram.com

** this is not a bug report ***
  Windows 3.0.0.0.  

 hi all,

it was a surprise to find :

In[ ]:=
Table[Round[LogGamma[n]/Log[4]],{n,24}] \!\($MaxExtraPrecision::"meprec"
\( : \ \) 
    "In attempting to evaluate \!\(Round[\(\(Log[2]\)\/\(Log[4]\)\)]\),
\ $MaxExtraPrecision \!\(50.`\) was encountered. Increasing the value
of \ $MaxExtraPrecision may help resolve the uncertainty."\) Out[8]=
\!\({0, 0, Round[Log[2]\/Log[4]], 1, 2, 3, 5, 6, 8, 9, 11, 13, 14, 16,
18, 
    20, 22, 24, 26, 28, 31, 33, 35, 37}\)

and :

In[12]:=Log[2]/Log[4] 
Out[12]=\!\(Log[2]\/Log[4]\)

In[13]:=Log[2]/Log[4] // Simplify
Out[13]=\!\(Log[2]\/Log[4]\)

In[14]:=Log[2]/Log[4] //FullSimplify Out[14]=\!\(1\/2\)

Of course al this is correct ! But shouldn't it be trapped by the
internal routines without causing 'blue fuss' ?


wouter.
-----------------------
EulerPhi[1] should be 1, not 0.
-----------------------


Dr. Wouter L. J. MEEUSSEN
w.meeussen.vdmcc at vandemoortele.be
eu000949 at pophost.eunet.be



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