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
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