[Date Index] [Thread Index] [Author Index]

Re: No trace of trace!

• To: mathgroup at smc.vnet.net
• Subject: [mg15163] Re: No trace of trace!
• From: Jens-Peer Kuska <kuska at informatik.uni-leipzig.de>
• Date: Thu, 17 Dec 1998 00:27:43 -0500
• Organization: Universitaet Leipzig
• References: <754ulc$je8@smc.vnet.net>
• Sender: owner-wri-mathgroup at wolfram.com

Hi Peter,

the Mathematica command Trace[] is for tracing the evaluation. It is
usefull when you are debugging Mathematica code. The trace of a matrix
can be implemented by

MatrixTrace[a_?MatrixQ]:=
  Plus @@ MapIndexed[Part[#1,First[#2]] &,a]

Hope that helps
  Jens


Peter Jay Salzman wrote:
> 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?
> 
> Pete