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MathGroup Archive 1992

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Mma vectors do not have to be one-dimensional

  • To: mathgroup at yoda.physics.unc.edu
  • Subject: Mma vectors do not have to be one-dimensional
  • From: pwm at macaw.jhuapl.edu (Phil W. Miller x8335 1-e138)
  • Date: Thu, 8 Oct 92 13:03:59 EDT

I posted a question yesterday regarding a problem I had with Mma ignoring
dimension for vectors.  Well, it was me, not Mma, that ignored dimension
when I defined my "vector" as x as {a,b}.

One can have row or column vectors in Mma.  It is simply
a matter of defining a column vector x as {{a},{b}}, or a
row vector y as {{a,b}}.  Then I do not need to worry about Dot
giving me the inner product instead of the intended outer product
for the expression A.x . Transpose[A.x] when x is one-dimensional.

After the rather obvious solution, I am rather embarrassed for needing
to ask the question.  Thanks to Jack Lee and Jerry Keiper for your help.

Phil Miller





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