Hi, try this(Not tested):
substitute(expression(1+2*pred+3*lat),list(pred=as.name(x1),lat=as.name(x2))) On 05/10/2007, Ronaldo Reis Junior <[EMAIL PROTECTED]> wrote: > > Hi, > > I try to use a substitute function to generalise a equation. > > I have this: > > expression(1+2*pred+3*lat) > > I need to define the equation in function of x1 and x2 variables. Also I > try > to define who is x1 and x2. I try this: > > X1 <- "pred" > X2 <- "lat" > > Now I need substitute pred and lat in equation by x1 and x2 defined on X1 > and > X2 above, I try this way: > > > > substitute(expression(1+2*pred+3*lat),list(as.name(X1)=as.name(x1),as.name > (X2)=as.name(x2)) > Error: unexpected '=' > in "substitute(expression(1+2*pred+3*lat),list(as.name(X1)=" > > My expected result is: > > expression(1 + 2 * x1 + 3 * x2) > > Any help? > Thanks > Ronaldo > -- > > Prof. Ronaldo Reis Júnior > | .''`. UNIMONTES/Depto. Biologia Geral/Lab. de Biologia Computacional > | : :' : Campus Universitário Prof. Darcy Ribeiro, Vila Mauricéia > | `. `'` CP: 126, CEP: 39401-089, Montes Claros - MG - Brasil > | `- Fone: (38) 3229-8187 | [EMAIL PROTECTED] | > [EMAIL PROTECTED] > | http://www.ppgcb.unimontes.br/ | ICQ#: 5692561 | LinuxUser#: 205366 > > ______________________________________________ > R-help@r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide > http://www.R-project.org/posting-guide.html > and provide commented, minimal, self-contained, reproducible code. > -- Henrique Dallazuanna Curitiba-Paraná-Brasil 25° 25' 40" S 49° 16' 22" O [[alternative HTML version deleted]]
______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
