Question: Working with Matrices,

I am working with matrices in maple, and just have a couple questions.

a) how do you make a matrix value "symbolic", and what does this mean (ie: i have a variable "j" in one of the matrices that I need to make symbolic).

b) when I go to do simple matrix arithmatic, and it doesn't compute, I get long errors.  How should I go about cleaning up these errors for the final document that I am creating?  Also, when do you need to call on the "linear algebra" code/package, and how do you go about doing this?

Thanks

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