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