[Survival Analysis]Compute AIC in Survival Analysis

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I want to compute the AIC value for my survival analysis objects (suvfit/coxph). When I try to do it, it says:

> AIC(cox)  Error in UseMethod("logLik") :    no applicable method for 'logLik' applied to an object of class "coxph"

For what I understand that's a software limitation. Can anyone help me to solve this problem without computing the AIC value by hand?

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关键词：Analysis Survival Analysi compute alysis understand limitation computing software survival

I remember I was computing it by hand, like this

p <- 0;k <- 3
AIC0 <- -2*cox$loglik[1] + 2*(p+k)
p <- length(cox$coef)
AIC1 <- -2*cox$loglik[2] + 2*(p+k)

other expressions?