I can't get switch() to work as expected with the letter 'E'. The following example from help works just fine.> ccc <- c("b","QQ","a","A","bb") > for(ch in ccc) cat(ch,":",switch(ch, a=1, b=2:3), "\n")b : 2 3 QQ : a : 1 A : bb : Now I replace "a=1" with "E=1"> for(ch in ccc) cat(ch,":",switch(ch, E=1, b=2:3), "\n")b : b QQ : QQ a : a A : A bb : bb If instead I replace "b=2:3" with "E=2:3" I get this:> for(ch in ccc) cat(ch,":",switch(ch, a=1, E=2:3), "\n")Error in switch(ch, a = 1, E = 2:3) : switch: EXPR must return a length 1 vector>"E" is the only letter that does this. Even 'e' works fine. Am I missing something obvious? Thanks in advance for any help. I'm using R 1.3.1 on Windows 2000. Kind regards, Andy Bernat. -.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.- 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 _._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._
On Fri, 9 Nov 2001, Andrew Bernat wrote:> I can't get switch() to work as expected with the letter 'E'. The following example from help works just fine. > > > ccc <- c("b","QQ","a","A","bb") > > for(ch in ccc) cat(ch,":",switch(ch, a=1, b=2:3), "\n") > b : 2 3 > QQ : > a : 1 > A : > bb : > > Now I replace "a=1" with "E=1" > > > for(ch in ccc) cat(ch,":",switch(ch, E=1, b=2:3), "\n") > b : b > QQ : QQ > a : a > A : A > bb : bb > > If instead I replace "b=2:3" with "E=2:3" I get this: > > > for(ch in ccc) cat(ch,":",switch(ch, a=1, E=2:3), "\n") > Error in switch(ch, a = 1, E = 2:3) : switch: EXPR must return a length 1 vector > > > > "E" is the only letter that does this. Even 'e' works fine. Am I missing something obvious? Thanks in advance for any help. I'm using R 1.3.1 on Windows 2000.Yes. The arguments to switch are switch(EXPR, ...). If anything in ... would partially match EXPR, you have to name the first argument, e.g. switch(EXPR=ch, a= 1, E = 2:3) It's often good practice to name arguments rather than rely on positional matching, and it's a bad idea to abbreviate argument names in R code. -- Brian D. Ripley, ripley at stats.ox.ac.uk Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/ University of Oxford, Tel: +44 1865 272861 (self) 1 South Parks Road, +44 1865 272860 (secr) Oxford OX1 3TG, UK Fax: +44 1865 272595 -.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.- 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 _._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._
Thanks for the very prompt solution and good advice, Dr. Ripley. ...Andy.>>> Prof Brian Ripley <ripley at stats.ox.ac.uk> 11/09/01 09:40AM >>>On Fri, 9 Nov 2001, Andrew Bernat wrote:> I can't get switch() to work as expected with the letter 'E'. The following example from help works just fine. > > > ccc <- c("b","QQ","a","A","bb") > > for(ch in ccc) cat(ch,":",switch(ch, a=1, b=2:3), "\n") > b : 2 3 > QQ : > a : 1 > A : > bb : > > Now I replace "a=1" with "E=1" > > > for(ch in ccc) cat(ch,":",switch(ch, E=1, b=2:3), "\n") > b : b > QQ : QQ > a : a > A : A > bb : bb > > If instead I replace "b=2:3" with "E=2:3" I get this: > > > for(ch in ccc) cat(ch,":",switch(ch, a=1, E=2:3), "\n") > Error in switch(ch, a = 1, E = 2:3) : switch: EXPR must return a length 1 vector > > > > "E" is the only letter that does this. Even 'e' works fine. Am I missing something obvious? Thanks in advance for any help. I'm using R 1.3.1 on Windows 2000.Yes. The arguments to switch are switch(EXPR, ...). If anything in ... would partially match EXPR, you have to name the first argument, e.g. switch(EXPR=ch, a= 1, E = 2:3) It's often good practice to name arguments rather than rely on positional matching, and it's a bad idea to abbreviate argument names in R code. -- Brian D. Ripley, ripley at stats.ox.ac.uk Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/ University of Oxford, Tel: +44 1865 272861 (self) 1 South Parks Road, +44 1865 272860 (secr) Oxford OX1 3TG, UK Fax: +44 1865 272595 -.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.- 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 _._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._