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MathGroup Archive 2006

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Re: Re: Unevaluated a[[1]]*a[[2]]

  • To: mathgroup at smc.vnet.net
  • Subject: [mg65187] Re: [mg65174] Re: Unevaluated a[[1]]*a[[2]]
  • From: "Alexandre Costa" <amscosta at uem.br>
  • Date: Fri, 17 Mar 2006 00:13:30 -0500 (EST)
  • References: <dvasti$c7q$1@smc.vnet.net> <200603161122.GAA18256@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

Thanks, that is a very simple way.
But suppose I want to extend that NonCommutativeMultiply operator (**) to
others operations: +, -, / . Does anybody have a clue how to do this ?
Suppose I have the expression for the roots of the quadratic equation: -
b[[a]]^2 + Sqrt[delta]/2*a[[j]]
How can I see at once all the numeric values unevaluated on that expression.
In short words, I have lenghtly expressions(with sums,subtraction,divisions
and multiplications and powers) and I want to check each numeric value of
each term in the original unevaluated formula.
I was thinking in a operator or function to solve all this issue.
Any help is very welcome,
Thanks,
Alex
----- Original Message -----
From: "Jens-Peer Kuska" <kuska at informatik.uni-leipzig.de>
To: mathgroup at smc.vnet.net
Subject: [mg65187] [mg65174] Re: Unevaluated a[[1]]*a[[2]]


> Hi,
>
> and why nor use an operation that does not
> evaluate a*b
> i.e.
> a = {0.1245, 0.543};
> a[[1]] ** a[[2]]
>
> Regards
>
>   Jens
>
> "Alexandre Costa" <amscosta at uem.br> schrieb im
> Newsbeitrag news:dvasti$c7q$1 at smc.vnet.net...
> | Dear Group,
> | Suppose I have  a = {0.1245, 0.543};
> | I want to check the values of the product:
> | a[[1]]*a[[2]]. So I just want to see the product
> unevaluated as output:
> | 0.1245*0.543.
> | Thanks,
> | Alex
> |
> |
>
>


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