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Re: How to declare vectors for solving

  • To: mathgroup at smc.vnet.net
  • Subject: [mg106470] Re: How to declare vectors for solving
  • From: dh <dh at metrohm.com>
  • Date: Thu, 14 Jan 2010 05:45:40 -0500 (EST)
  • References: <hik907$6mo$1@smc.vnet.net>


Hi John,

the components need not have values, but you need at least a name. 

Either you  write your vectors in component form, but then you have to 

name the components. Or you write the vectors symbolically, but then 

Cross[a,b] is a new vector and can not be evaluated further.

Daniel



John Rivers wrote:

> currently I do this:

> 

> a = {ax, ay, az};

> b = {bx, by, bz};

> 

> then I can work with Cross[a, b] etc.

> 

> and then Solve[]

> 

> is there a way to declare a as a vector with 3 elements - but not give

> values?

> 

> 

> 




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