Hi all ! I am look for some efficient method to compute the derivative of exponential matrix function in R. For example, I have a simple matrix like
log.Sigma <- matrix(c(par1, rho, rho, par2),2,2) require(Matrix) Sigma <- expm(log.Sigma) I want some method to compute the derivatives of Sigma in relation the parameters par1, par2 and rho. Some idea ? -- Wagner Hugo Bonat LEG - Laboratório de EstatÃstica e Geoinformação UFPR - Universidade Federal do Paraná [[alternative HTML version deleted]]
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