From hugh@p@r@on@ge @ending from gm@il@com  Thu May 10 15:17:32 2018
From: hugh@p@r@on@ge @ending from gm@il@com (Hugh Parsonage)
Date: Thu, 10 May 2018 23:17:32 +1000
Subject: [Rd] grDevices::grey could provide clearer error message when
 length(alpha) != length(level)
Message-ID: <CAJmOi+NAtsQ_KL3etrswJuKGENR_2uhzxAP6VF1M3htRAX9RSg@mail.gmail.com>

e.g.

grDevices::grey(level = 0.1, alpha = c(0, 1))
#> Error in grey(level = 0.1, alpha = c(0, 1)) :
#>  attempt to set index 1/1 in SET_STRING_ELT

Perhaps
#> Error in grey(level = 0.1, alpha = c(0, 1)) :
#>  lengths of 'level' and 'alpha' differ



[Rd] grDevices::grey could provide clearer error message when length(alpha) != length(level)
Hugh Parsonage