From: Martin C. Martin <martin_at_metahuman.org>

Date: Fri 05 Aug 2005 - 03:37:23 EST

R-help@stat.math.ethz.ch mailing list

https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html Received on Fri Aug 05 03:50:45 2005

Date: Fri 05 Aug 2005 - 03:37:23 EST

Hi,

Trying this:

deriv(expression(sum(x)), "x")

Gives the error message:

Function 'sum' is not in the derivatives table

I'd like to add it, is this difficult? If not, where is the derivatives table?

However, give how basic "sum" is, I suspect it would have been added if it were straightforward. Do functions in the derivatives table need to be vectorized? i.e. given a vector of length n, they need to produce a vector of length n? Or is there some other restriction?

Thanks,

Martin

R-help@stat.math.ethz.ch mailing list

https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html Received on Fri Aug 05 03:50:45 2005

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