[R] deriv3 example on Venables/Ripley page 263

[Michael Wang]

What does it require to run the example on page 263
of Venables/Ripley book using R 1.3.0?

I got the following error and I have no clue how to correct it.

Thank you very much. (If you reply to the list, please send a
copy to me.)

> lmix2 <- deriv3(
+ ~ -log(p*dnorm((x-u1)/s1)/s1 + (1-p)*dnorm((x-u2)/s2)/s2),
+ c("p", "u1", "s1", "u2", "s2"),
+ function(x, p, u1, s1, u2, s2) NULL)

Error in deriv3.formula(~-log(p * dnorm((x - u1)/s1)/s1 + (1 - p) * dnorm((x -  : 

        Function H is not in the derivatives table
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