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MathGroup Archive 1998

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Re: No trace of trace!

  • To: mathgroup at smc.vnet.net
  • Subject: [mg15129] Re: No trace of trace!
  • From: "Allan Hayes" <hay at haystack.demon.co.uk>
  • Date: Wed, 16 Dec 1998 03:11:08 -0500
  • References: <754ulc$je8@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

Peter Jay Salzman wrote in message <754ulc$je8 at smc.vnet.net>...
.....
>After looking for close to 5 minutes, I've concluded that the Trace
>*matrix* operation is either not present or well hidden.
>
>Can someone tell me which one?

Peter,
In Mathematica 3.0x you need Tr  not Trace

Tr[{{a, b}, {c, d}}]

a + d

Trace is a function that gives the steps in an evaluation (TracePrint is
another one).

Finding functions can be tricky, but you will find Tr in

 Help>Help>Built-in Functions>Lists and Matrices>Matrix Operations>Tr

Allan

---------------------
Allan Hayes
Mathematica Training and Consulting
www.haystack.demon.co.uk
hay at haystack.demon.co.uk
Voice: +44 (0)116 271 4198
Fax: +44 (0)870 164 0565



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