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Vector problem

• To: mathgroup at smc.vnet.net
• Subject: [mg115895] Vector problem
• From: Mark Perrin <m.perrin at me.com>
• Date: Tue, 25 Jan 2011 04:19:45 -0500 (EST)
• References: <201101241023.FAA29224@smc.vnet.net>

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>