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matrix operations

I am new to SAGE. I need to create a matrix by using matrices of different sizes. For example:

Abar= [(A + B), C]

    [  D ,  E]

where A and B are 2x2's, C is a 2x1, D is a 1x2, and E is a 1x1. I do not need Abar to be a partitioned matrix. Thanks much.

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fix title for better search results, align matrix

creating a matrix operationsfrom blocks

I am new to SAGE. I need to create a matrix by using matrices of different sizes. For example:

Abar= [(A + B), C]

C]
      [  D ,   E]

where A and B are 2x2's, C is a 2x1, D is a 1x2, and E is a 1x1. I do not need Abar to be a partitioned matrix. Thanks much.