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MathGroup Archive 2012

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MatrixForm odd behaviour

  • To: mathgroup at smc.vnet.net
  • Subject: [mg124417] MatrixForm odd behaviour
  • From: roby <roby.nowak at gmail.com>
  • Date: Thu, 19 Jan 2012 05:08:54 -0500 (EST)
  • Delivered-to: l-mathgroup@mail-archive0.wolfram.com

Dear Group

As a similar Question is discussed on the group now.

The following issue:

When entering e.g.:
Dot[MatrixForm[{{1, 0}, {0, 2}}], MatrixForm[{{1, 0}, {0, 2}}]]
Mathematica does not evaluate the Dot operation and displays the two unchanged
input matrices seperated by a "Dot" each respectively wrapped by
MatrixForm, so far so good (or perhaps not so good).

But if one now marks the most recent Mathematica output, the two "Dot"
seperated matrices and copy and paste's  them into a new Mathematica cell,
both matrices still are seperated By "Dot", still looking like two
MatrixForm wrapped matrices.
But if you now evaluate the new cell guess what happens: the Dot
operation is performed (despite both matrices seem to be wrapped by
MatrixForm) and the result is displayed (of course not matrixForm
wrapped)

seems highly inconsistent, or ?

other funny things to try:
TraditionalForm[2] * TraditionalForm[2]
or:
Times[TraditionalForm[2], TraditionalForm[2]]


Cheers Robert



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