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MathGroup Archive 1995

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Re: Re: list of Mma commands with specified properties

  • To: mathgroup at christensen.cybernetics.net
  • Subject: [mg744] Re: [mg698] Re: [mg644] list of Mma commands with specified properties
  • From: "Dennis M. Schneider" <dschneid at knox.edu>
  • Date: Wed, 12 Apr 1995 10:29:14 -0500 (CDT)


On Mon, 10 Apr 1995, Richard Mercer wrote:

> Jack Goldberg writes:
> 
> 
> >  Another student asked this question (actually it was me):
> >  	(3) Is there a way of forcing the front end to
> >  	produce
> >  	     output in MatrixForm in a given Mma session
> >  	    rather than a list of lists (of equal length)
> >  	    as it does now?
> >  This is of value when one knows in advanced that a
> >  particular session will be dealing entirely with matrices.
> 
> $PrePrint = If[MatrixQ[#],MatrixForm[#],#]]&
> 
> makes life worth living again! Every matrix now comes out in MatrixForm  
> automatically. Even some you didn't really want to!
> 
> Have you ever tried to do further calculations with matrices to which you had  
> applied MatrixForm? It doesn't work, because the head MatrixForm stays  
> attached! A major pain in the neck, which the $PrePrint solution avoids.
> 
> Richard Mercer
> 

Another way to handle this is to train oneself to enter matrices you 
really want to view as matrices as 
	(matA = {{a,b},{c,d}})  //MatrixForm
Normal computations can be carried out on matA.

Dennis Schneider



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