[R] Direct sum of matrices

[Kenneth]

Hi R users:

How can I built a direct sum function of matrices in R?

I mean A(mxn), B(pxq), C(rxs),...

X<-ds(A,B,C,...)

X = [ A,  0,  0
            0,  B,  0
           0,   0,  C] ((m+p+r+...) x (n+q+s+...))

Thank you for your help.

Kenneth

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