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MathGroup Archive 1990

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math coprocessors

  • To: mathgroup at yoda.ncsa.uiuc.edu
  • Subject: math coprocessors
  • From: jdelany at sargas.ACS.CalPoly.EDU (Jim Delany)
  • Date: Sat, 20 Oct 90 11:30:23 PDT

Richard Fateman's note on the pitfalls of relying on the Motorola floating
point coprocessor prompts me to share the example I like to use:    


Mathematica (sun3.68881) 1.2 (November 6, 1989) [With pre-loaded data]
 ...

In[1]:= x = 2^100;

In[2]:= N[ Sin[x] ]

Out[2]= 0.973158

In[3]:= N[ Sin[x], 40 ]

Out[3]= -0.872183605


The difference between the hardware and software values is almost 2.
Does anyone have a sharper example?


Jim Delany   ( jdelany at cosmos.acs.calpoly.edu )

Math Department, Cal Poly, San Luis Obispo  CA  93407


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