[R] Generate object names from variables
Hi, I want to generate object names out of variables in a sort of variable substitution. first i generate some vectors and an empty list: vector.a-c(a,b) vector.b-c(c,d) vector.c-c(e,f) vectors-c(vector.a, vector.b, vector.c) vectors [1] vector.a vector.b vector.c vectorlist-list() What I would then like to do is to generate elements of the list by using variables, somehow like this (does not work): for (i in vectors) { + list$i-i + } To end up with a list like this: list $vector.a [1] a b $vector.b [1] c d $vector.c [1] e f Any hint will be appreciated. Cheers, Georg __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
Re: [R] Generate object names from variables
Try this: sapply(vectors, get, simplify = FALSE) or lapply(vectors, get) although the last one does not give you the names. On 7/14/06, Georg Otto [EMAIL PROTECTED] wrote: Hi, I want to generate object names out of variables in a sort of variable substitution. first i generate some vectors and an empty list: vector.a-c(a,b) vector.b-c(c,d) vector.c-c(e,f) vectors-c(vector.a, vector.b, vector.c) vectors [1] vector.a vector.b vector.c vectorlist-list() What I would then like to do is to generate elements of the list by using variables, somehow like this (does not work): for (i in vectors) { + list$i-i + } To end up with a list like this: list $vector.a [1] a b $vector.b [1] c d $vector.c [1] e f Any hint will be appreciated. Cheers, Georg __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
Re: [R] Generate object names from variables
On Fri, 2006-07-14 at 16:57 +0200, Georg Otto wrote: Hi, I want to generate object names out of variables in a sort of variable substitution. first i generate some vectors and an empty list: vector.a-c(a,b) vector.b-c(c,d) vector.c-c(e,f) vectors-c(vector.a, vector.b, vector.c) vectors [1] vector.a vector.b vector.c vectorlist-list() What I would then like to do is to generate elements of the list by using variables, somehow like this (does not work): for (i in vectors) { + list$i-i + } To end up with a list like this: list $vector.a [1] a b $vector.b [1] c d $vector.c [1] e f Any hint will be appreciated. Cheers, Georg Presuming that your vectors fit a naming pattern of vector.x: # Use grep() to get the vector names from ls() vectors - grep(vector[\.], ls(), value = TRUE) vectors [1] vector.a vector.b vector.c # Use sapply to create the list sapply(vectors, get, simplify = FALSE) $vector.a [1] a b $vector.b [1] c d $vector.c [1] e f HTH, Marc Schwartz __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
Re: [R] Generate object names from variables
I collected some advice about this question a couple of years ago. This might help. http://pj.freefaculty.org/R/Rtips.html#2.1 Add variables to a data frame (or list) and the next one after that. On 7/14/06, Marc Schwartz (via MN) [EMAIL PROTECTED] wrote: On Fri, 2006-07-14 at 16:57 +0200, Georg Otto wrote: Hi, I want to generate object names out of variables in a sort of variable substitution. first i generate some vectors and an empty list: vector.a-c(a,b) vector.b-c(c,d) vector.c-c(e,f) vectors-c(vector.a, vector.b, vector.c) vectors [1] vector.a vector.b vector.c vectorlist-list() What I would then like to do is to generate elements of the list by using variables, somehow like this (does not work): for (i in vectors) { + list$i-i + } To end up with a list like this: list $vector.a [1] a b $vector.b [1] c d $vector.c [1] e f Any hint will be appreciated. Cheers, Georg -- Paul E. Johnson Professor, Political Science 1541 Lilac Lane, Room 504 University of Kansas __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html