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Replacing part of a matrix by another


Given a matrix M and a smaller matrix L, what is an elegant way to replace a
submatrix of M by L, at some specified position {p,q}?

For example:

given:
M = Array[m,{5,5}]
L = Array[l,{2,2}]
{p,q}={2,3}

L should replace {{m[2,3],m[2,4]},{m[3,3],m[3,4]}}.

Thanks,
Dani




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