Fitting a Gumbel distribution with fitdistrplus

Question

I'm trying to reproduce the code from this answer, however I have problems in doing so. I'm using the gumbel distribution from package VGAM and fitdistrplus. The problem emerges when doing:

fit   = fitdist(data1, 'gumbel', start = list(location = 0, scale = 1))
Error in mledist(data, distname, start, fix.arg, ...) : 
  'start' must specify names which are arguments to 'distr'.

As if location and scale were not arguments of *gumbel.

dgumbel, pgumbel, rgumbel and qgumbel are correctly provided by VGAM. However the package also provides a function called gumbel, with different syntax. May this be causing problems?

EDIT: yes indeed it is causing problems: using package FAdist instead works perfectly fine.

Answer 1

For reference, from the package vignette linked in comments:

library(fitdistrplus)
data(groundbeef)
serving <- groundbeef$serving
dgumbel <- function(x, a, b) 1/b*exp((a-x)/b)*exp(-exp((a-x)/b))
pgumbel <- function(q, a, b) exp(-exp((a-q)/b))
qgumbel <- function(p, a, b) a-b*log(-log(p))
fitgumbel <- fitdist(serving, "gumbel", 
    start=list(a=10, b=10))

Or with the functions from VGAM:

rm(dgumbel) ## get rid of previous definition
## hack behaviour of VGAM::pgumbel() a little bit
pgumbel <- function(x,...) {
  if (length(x)==0) numeric(0) else VGAM::pgumbel(x,...)
}
library(VGAM)
fitgumbel <- fitdist(serving, "gumbel", 
       start=list(location=10, scale=10))