As you can see, could you know how many columns of matrix ee has?

It is not easy.

The true column number is 7.

Is there a good method to sperate differetn columns apart? for example, use comma

Maple always treat A as a scalar. How to solve this problem? Thank you.

Hi, I hope to use symbol A, B, directly to get C derivation, without using elements forms of matrix, as shown below.

How to achieve this? 

Thank you.

I created my own package and one procudure inside this package is to calculate the eigenvalues of a identity matrix, as shown below

Then, I use this package in another document, all other procedures work well except the procedure calculating egigenvalues, as shown below

How to solve this problem? Thank you.