Does not work for list of functions (?) about deriv

[savemark]

Nevermind, I did find a solution:

list2env(myfun, environment())
Deriv(f)
#function (x) 
#par * x^(par - 1)

I'll leave it here in case anyone else have the same problem.

[sgsokol]

Right. As the error message suggests, get() cannot use expression with $ or any subindexing to find an object. It must be a plain name like f in your second example.

[sgsokol]

After some reflexion, I have found a way to circumvent get() limitations and now (i.e. starting from v3.8.4) your example gives:

(fd<-Deriv(myfun$f))
# function (x) 
# par * x^(par - 1)
# <environment: 0x29034b8>
fd(3)
# [1] 6

Please feel free to report any problem with proposed solution.

PS. The version 3.8.4 is not on CRAN yet (as of this writing) but you can test it with usual

devtools::install_github("sgsokol/Deriv")