This is something between a question and a bug report.
{sometimes one should first ask on R-help before sending to R-bugs....}
I wanted to plot (.) a formula with "..."
## Works :
e0 <- expression(T(x[1],...x[n])*", "*N[1] == 101) # works ok
plot(1, main = e0)
## Now, need substitute, to replace with value of variableThis works
nn <- 102
(e1 <- substitute(T(x[1],...x[n])*", "*N[1] == n1, list(n1=nn)))
plot(1,main=e1)
## this works, but only because of a typo: I forgot one ","
## This ``should'' work, but does not :
e2 <- substitute(T(x[1],...,x[n])*", "*N[1] == n1, list(n1=nn))
##>> Error: ... used in an incorrect context
--
Martin Maechler <maechler at stat.math.ethz.ch>
http://stat.ethz.ch/~maechler/
Seminar fuer Statistik, ETH-Zentrum LEO D10 Leonhardstr. 27
ETH (Federal Inst. Technology) 8092 Zurich SWITZERLAND
phone: x-41-1-632-3408 fax: ...-1228 <><
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Martin Maechler <maechler at stat.math.ethz.ch> writes:> This is something between a question and a bug report. > {sometimes one should first ask on R-help before sending to R-bugs....}..> ## This ``should'' work, but does not : > > e2 <- substitute(T(x[1],...,x[n])*", "*N[1] == n1, list(n1=nn)) > > ##>> Error: ... used in an incorrect contextI think that is a bug. Simplest variant:> substitute(a(...))Error: ... used in an incorrect context I think the basic issue is that when you use ... in a function, substitute will try to match it against the actual parameter list, e.g.> f<-function(...)substitute(a(...)) > f(2)a(2)> f(2,3,4)a(2, 3, 4) However, when there's no ... argument to f, substitute will complain, as would any other function trying to handle ... but the semantics of substitute should be different. Robert? -- O__ ---- Peter Dalgaard Blegdamsvej 3 c/ /'_ --- Dept. of Biostatistics 2200 Cph. N (*) \(*) -- University of Copenhagen Denmark Ph: (+45) 35327918 ~~~~~~~~~~ - (p.dalgaard at biostat.ku.dk) FAX: (+45) 35327907 -.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.- r-help mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html Send "info", "help", or "[un]subscribe" (in the "body", not the subject !) To: r-help-request at stat.math.ethz.ch _._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._