[R] matrix "Adjoint" function
Reid Huntsinger
rhuntsinger at verizon.net
Mon Aug 28 23:52:55 CEST 2006
Sometimes the term "adjoint matrix" refers to the "matrix of cofactors",
that is, the matrix of signed determinants of n-1 x n-1 dimensional
submatrices. This is just the inverse multiplied by the determinant. As
with both the inverse and determinant, if this is part of a larger
computation there are often better ways to solve the problem avoiding
explicit computation of determinants or inverses.
Reid Huntsinger
Peter Dalgaard wrote:
>"Jessica M. Maia" <jmmaia at unity.ncsu.edu> writes:
>
>
>
>>Hi there,
>>
>>I'm new to R and despite searching today, I can't
>>find a function which will compute the adjoint of
>>a matrix A. Does this adjoint function exist in R?
>>
>>
>
>I don't think so, but the adjoint matrix is also known as the
>conjugate transpose and we do have t() and Conj(). (If your matrix is
>real, t() will do.)
>
>
>
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