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Experimental`$EqualTolerance

  • To: mathgroup at smc.vnet.net
  • Subject: [mg105395] Experimental`$EqualTolerance
  • From: Andrzej Kozlowski <akoz at mimuw.edu.pl>
  • Date: Tue, 1 Dec 2009 04:13:25 -0500 (EST)

The functions $EqualTolerance and $SameQToleranceexists in the 
Experimantel context both in Mathematica 5.2 and in later versions. But 
while in 5.2 I get

In[1]:=
Experimental`$EqualTolerance

Out[1]=
2.10721

In 7.01 I get:

In[44]:= Experimental`$EqualTolerance

Out[44]= Experimental`$EqualTolerance

Further more, it seems that although the function name $EqualTolerance 
has been retained in the Experimental context, the function itself no 
longer does anything. Compare:

Mathematica 5.2

In[9]:=
Block[{Experimental`$EqualTolerance =16}, 1. == 2.]

Out[9]=
True

Mathematica 7.01

In[58]:= Block[{Experimental`$EqualTolerance = 16}, 1. == 2.]

Out[58]= False


Was keeping Experimental`$EqualTolerance while removing its definition 
in Mathematica 7 just an oversight or does it still serve some purpose? 
And has the functionality been transferred to some other function?

Andrzej Kozlowski


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