MatrixForm

*To*: mathgroup at smc.vnet.net*Subject*: [mg8804] MatrixForm*From*: Kent Day <kentd at ces.clemson.edu>*Date*: Thu, 25 Sep 1997 12:26:40 -0400*Organization*: Clemson University*Sender*: owner-wri-mathgroup at wolfram.com

I am new to mathematica and am having a problem understanding the way it uses MatrixForm. The manual says it only affects the look of the equation and not the way it is processed however if I use it I get "strange" results. a={{a11,a12},{a21,a22}} b={{b11,b12},{b21,b22}} MatrixForm[a+b] MatrixForm[a]+MatrixForm[b] MatrixForm[a]+b all yield different results. Only the first one being what I would've expected i.e. a new matrix {{a11+b11,{a12+b12} etc.. the last one gives the strangest result in which is each element of b is added to the entrire a matrix. any suggestions? also, once a function is in matrixForm as in f=MatrixForm[a] how can I get f back into list form (is there a ListForm kind of command?) if you reply could you cc my email hkowalc at eng.clemson.edu thanks Henri Kowalczyk