RE: Help on use of Packages

*To*: mathgroup at smc.vnet.net*Subject*: [mg2212] RE: [mg2175] Help on use of Packages*From*: "John R. Fultz" <jfultz>*Date*: Mon, 16 Oct 1995 11:54:07 -0400

The way you assign your variables a and b store MatrixForm as a part of the variable: In[2]:= FullForm[a] Out[2]= MatrixForm[List[List[a11, a12], List[a21, a22]]] The MatrixManipulation commands don't pass transparently through the MatrixForm function; they instead treat it as a single entity. If you assign your vars without MatrixForm, it works. If you'd like to still see the output in MatrixForm, you can do: MatrixForm[a={{a11,a22},{a21,a22}}] Here the MatrixForm remains outside the assignment. John Fultz Wolfram Research, Inc. ---------- >From: Yuan Zheng[SMTP:zheng at risky.ecs.umass.edu] >To: mathgroup at smc.vnet.net >Subject: [mg2175] Help on use of Packages Hi, I have the following problem when I use the LinearAlgebra`MatrixManipulation Package. I also use Math2.2 for DOS and wnmath2.2 notebook. All of them have the same result. I am new to the Mathematica. Are there something I am doing wrong? I followed the exact procedure described on pp 218-219 in the book Guide to Standard Mathematica Packages Version 2.2. I need to do a lot of matrix manipulations in my symbolic computation. Could somebody help me to solve this problem? Thanks Yuan Zheng Dept of Mechanical Engineering Umass, Amherst