[R] Basic matrix manipulation problem

[Hans Thompson]

Hello, this forum was very helpful yesterday with a simple question I had on
working with tables.   What function will I need to use to do the following.

Move matrix a:

       A    B   C   D
x    1    2    3    4
y    5    6    7    8

to the mean of B&C and C&D:

      BC  CD  
x   2.5  3.5
y   6.5  7.5

and then to the mean of B&CB, C&BC, C&CD, and D&CD:

     AAB  BAB  CCD  DCD
x  1.75  2.25  3.25  3.75
y  6.25  6.75  7.25  7.75

Thanks again for any help.  I'm putting in some good time after work trying
to learn this language and any help would be great.

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