# How make a x,y dataset from a formula based entry

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## How make a x,y dataset from a formula based entry

 Hello all, So I am using the (formula entry) method for randomForests: randomForest(y~x1+x2+...+x39+x40,data=xxx,...) but the issue is that some of the items in that package dont take a formula entry - you have to explicitly state the y and x vector: randomForest(x=xxx[,c('x1','x2',...,'x40')],y=xxx[,'y'],...) Now my question is whether there is a function/way to tell R to take a formula and make the two corresponding datasets [x,y] (that way I dont have to create the x dataset manually with all 40 variables I have). There must be a more elegant way to do this than x=xxx[,c('x1','x2',...,'x40')] Thanks! George
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## Re: How make a x,y dataset from a formula based entry

 Hello, You can check ?model.frame. I do not know however to extract only the right-hand of left-hand part of a formula. JC 2011/9/22 trekvana <[hidden email]>: > Hello all, > > So I am using the (formula entry) method for randomForests: > > randomForest(y~x1+x2+...+x39+x40,data=xxx,...) but the issue is that some of > the items in that package dont take a formula entry - you have to explicitly > state the y and x vector: > > randomForest(x=xxx[,c('x1','x2',...,'x40')],y=xxx[,'y'],...) > > Now my question is whether there is a function/way to tell R to take a > formula and make the two corresponding datasets [x,y] (that way I dont have > to create the x dataset manually with all 40 variables I have). > > There must be a more elegant way to do this than > x=xxx[,c('x1','x2',...,'x40')] > > Thanks! > George > > -- > View this message in context: http://r.789695.n4.nabble.com/How-make-a-x-y-dataset-from-a-formula-based-entry-tp3834477p3834477.html> Sent from the R help mailing list archive at Nabble.com. > > ______________________________________________ > [hidden email] 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. > ______________________________________________ [hidden email] mailing list https://stat.ethz.ch/mailman/listinfo/r-helpPLEASE do read the posting guide http://www.R-project.org/posting-guide.htmland provide commented, minimal, self-contained, reproducible code.
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## Re: How make a x,y dataset from a formula based entry

 In reply to this post by trekvana To separate the parts of a formula, use as.character (check the examples in ?character) Helios 22 Sep 2011 16:14:05 -0400 From: Jean-Christophe BOU?TT? <[hidden email]> > Hello, > You can check ?model.frame. > I do not know however to extract only the right-hand of left-hand part > of a formula. > > JC > > 2011/9/22 trekvana <[hidden email]>: >> Hello all, >> >> So I am using the (formula entry) method for randomForests: >> >> randomForest(y~x1+x2+...+x39+x40,data=xxx,...) but the issue is that some of >> the items in that package dont take a formula entry - you have to explicitly >> state the y and x vector: >> >> randomForest(x=xxx[,c('x1','x2',...,'x40')],y=xxx[,'y'],...) >> >> Now my question is whether there is a function/way to tell R to take a >> formula and make the two corresponding datasets [x,y] (that way I dont have >> to create the x dataset manually with all 40 variables I have). >> >> There must be a more elegant way to do this than >> x=xxx[,c('x1','x2',...,'x40')] >> >> Thanks! >> George INSTITUTO DE BIOMECÁNICA DE VALENCIA Universidad Politécnica de Valencia • Edificio 9C Camino de Vera s/n • 46022 VALENCIA (ESPAÑA) Tel. +34 96 387 91 60 • Fax +34 96 387 91 69 www.ibv.org   Antes de imprimir este e-mail piense bien si es necesario hacerlo. En cumplimiento de la Ley Orgánica 15/1999 reguladora de la Protección de Datos de Carácter Personal, le informamos de que el presente mensaje contiene información confidencial, siendo para uso exclusivo del destinatario arriba indicado. En caso de no ser usted el destinatario del mismo le informamos que su recepción no le autoriza a su divulgación o reproducción por cualquier medio, debiendo destruirlo de inmediato, rogándole lo notifique al remitente. ______________________________________________ [hidden email] mailing list https://stat.ethz.ch/mailman/listinfo/r-helpPLEASE do read the posting guide http://www.R-project.org/posting-guide.htmland provide commented, minimal, self-contained, reproducible code.