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MathGroup Archive 2005

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Re: Some Mathematica tips & tricks

  • To: mathgroup at smc.vnet.net
  • Subject: [mg61835] Re: [mg61821] Some Mathematica tips & tricks
  • From: Bob Hanlon <hanlonr at cox.net>
  • Date: Tue, 1 Nov 2005 00:39:23 -0500 (EST)
  • Reply-to: hanlonr at cox.net
  • Sender: owner-wri-mathgroup at wolfram.com

When a parameter such as an iterator is being held, use Evaluate

First /@ Attributes /@ {Table, Do, Sum, Product}

{HoldAll, HoldAll, HoldAll, HoldAll}

iter={i, 1, 3};

#[f[i], Evaluate[iter]]& /@ {Table, Sum, Product}

{{f(1), f(2), f(3)}, f(1)+f(2)+f(3), f(1) f(2) f(3)}


Bob Hanlon

> 
> From: Kristjan Kannike <kkannike at physic.ut.ee>
To: mathgroup at smc.vnet.net
> Date: 2005/10/31 Mon AM 01:17:16 EST
> To: mathgroup at smc.vnet.net
> Subject: [mg61835] [mg61821] Some Mathematica tips & tricks
> 
> Hello everyone,
> 
> In my first post to MathGroup, I would like to draw attention to some
> Mathematica tips & tricks I have posted on my web site
> <http://www.physic.ut.ee/~kkannike/english/prog/mathematica/>:
> 
> constructing Tables with a previously unknown number of iterators;
> 
> an attempt to make indexed variables more like a hash or dictionary type
> in Perl or Python.
> 
> Also there is a discussion of patterns for multiplying "scalar-looking"
> terms in matrix equations by the unit matrix
> <http://www.physic.ut.ee/~kkannike/english/prog/mathematica/patterns/
>.
> 
> (And a full-blown Mathematica program to solve renormalization group
> equations in effective field theories
> <http://www.physic.ut.ee/~kkannike/english/science/physics/
RGE_run_EFT/>.)
> 
> Kristjan Kannike
> <http://www.physic.ut.ee/~kkannike/english/>
> 
> 


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