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The following problem is motivated by one of my research problems. If you can solve this before me, I will include you as co-author in my work. Let $ \Sigma$ be an $ n \times n$ correlation matrix whose least eigenvalue is denoted by $ \lambda$ . $ \Sigma_i’$ be an $ (n-1) \times (n-1)$Read more

Given a normal matrix, for example m = Array[a,{4,4}] which has dimensions {4,4}, I can partition it by using: m2 = Partition[m,{2,2}], which has dimensions {2,2,2,2}. Now, if m is a sparse array, for example: m = SparseArray[Table[{i,i}->i,{i,1,4}],{4,4}] I would like to be able to partition it in a similar manner but with the resultRead more