eval() and parse() are you friends here. Possibly also substitute(). Example:
eval(parse(text="expand.grid(c(1,0),c(1,0))")) However, I would like to reply with a question to you. Why do you end up with a string that you need to convert in the first place? Maybe you are more interested in a solution like the following one: N <- 2 l <- lapply(1:N, FUN=function(x) c(0,1)) expand.grid(l) Henrik Bengtsson Lund University > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of > [EMAIL PROTECTED] > Sent: den 12 september 2003 18:55 > To: [EMAIL PROTECTED] > Subject: [R] Converting character to function argument > > > How can one transform a character string into an argument of > a function (which is not or I don't want it to be a character string)? > > Example: > > > expand.grid(c(1,0),c(1,0)) ## OK > Var1 Var2 > 1 1 1 > 2 0 1 > 3 1 0 > 4 0 0 > > > > paste(rep("c(0,1)",2),collapse=',') ## to be used below > [1] "c(0,1),c(0,1)" > > ## string is the input I want, but it needs to be coerced to the > > correct > format > > > expand.grid(paste(rep("c(0,1)",2),collapse=',')) ## does not get me > > there > Var1 > 1 c(0,1),c(0,1) > > ************************************************************** > ************* > AVISO DE CONFIDENCIALIDADE: Esta mensagem, assim como os > ficheiros eventualmente anexos, � confidencial e reservada > apenas ao conhecimento > da(s) pessoa(s) nela indicada(s) como destinat�ria(s). Se n�o > � o seu destinat�rio, solicitamos que n�o fa�a qualquer uso > do respectivo conte�do e proceda � sua destrui��o, > notificando o remetente. LIMITA��O DE RESPONSABILIDADE: A > seguran�a da transmiss�o de informa��o por via electr�nica > n�o pode ser garantida pelo remetente, o qual, em > consequ�ncia, n�o se responsabiliza por qualquer facto > suscept�vel de afectar a sua integridade. > > CONFIDENTIALITY NOTICE: This message, as well as existing > attached files, is confidential and intended exclusively for > the individual(s) named as addressees. If you are not the > intended recipient, you are kindly requested not to make any > use whatsoever of its contents and to proceed to the > destruction of the message, thereby notifying the sender. > DISCLAIMER: The sender of this message can not ensure the > security of its electronical transmission and consequently > does not accept liability for any fact which may interfere > with the integrity of its content. > > ______________________________________________ > [EMAIL PROTECTED] mailing list > https://www.stat.math.ethz.ch/mailman/listinfo> /r-help > > ______________________________________________ [EMAIL PROTECTED] mailing list https://www.stat.math.ethz.ch/mailman/listinfo/r-help
