Re: Vector problem

*To*: mathgroup at smc.vnet.net*Subject*: [mg115896] Re: Vector problem*From*: Mark Perrin <m.perrin at me.com>*Date*: Tue, 25 Jan 2011 04:19:56 -0500 (EST)*References*: <201101241023.FAA29224@smc.vnet.net>

Ha! Forget my last question. The power of Mathematica. Simply wrap these statements into a solve function. Solve[{Projection[z,u] == u, Projection[z,v] ==v}, z] MP On 2011-01-24, at 10:52 PM, Mark Perrin wrote: > I'm having trouble formulating a problem in Mathematica. > > If I have two 2D vectors, u and v that are the known projections of a third unknown 2D vector z, how do I determine z? > > My word problem (I think) is find the solution to: Projection[z,u] == u && Projection [z,v] == v > > Any help in starting this problem would be much appreciated. >

**References**:**Re: Do I need MathLink to run finite-difference fast enough for***From:*Oliver Ruebenkoenig <ruebenko@wolfram.com>