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Hi All I would like to know how to access the values of the variable lambda.mu and and see what abs(lambdas[1]) does since lambdas is not a keyword. Snippet of the code: scoreFunction <- function(lambdas) { lambda.mu <- abs(lambdas[1]) sme.em(yi,tmei,Xi,Ni,G,lambda.mu,lambda.v)$AICc } Thanks in advance. Regards Ap -- Aparna Sampath Master of Science (Bioinformatics)