[R] How to write the log function in R

[toh]

Hi,

I need help to write the following log-likelihood function in R:
log(L) = sum [(y_k - y_k-1).log(m(t_k) - m(t_k-1)) - (m(t_k) - m(t_k-1)) -
log((y_k -y_k-1)!)]

I need to write this log-likelihood function in order to find the parameters
by MLE method. 

Appreciate the help.


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