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? > > >