[R] MACRO-LOOP in R
Jeff Newmiller
jdnewmil at dcn.davis.ca.us
Thu Feb 18 18:26:34 CET 2016
What a mess. Transposing factors is highly unlikely to lead to sensible results. Did you look at str( x123 ) as your example created it?
x <- data.frame( a=c(1,2,3), b=c("1","2","3"), stringsAsFactors=FALSE )
x123new <- setNames( as.data.frame( t( x[ , "b" ] ) ), paste( "b", 1:3, sep="_" ) )
R is not SAS. Please read the Introduction to R document (again). Pay attention to the discussions of indexing, character mode and factors.
--
Sent from my phone. Please excuse my brevity.
On February 18, 2016 8:17:47 AM PST, Amoy Yang via R-help <r-help at r-project.org> wrote:
>I am doing the data transpose with rename as shown below (step1 ~
>step4)
>1. Is any way in R similar to PROC TRANSPOSE used in SAS?2. How to use
>MACRO-LOOP to simplify the following procedure?
>THANK YOU FOR HELPS!
># create data for test
>x<-data.frame(
> a=c(1,2,3),
> b=c("1","2","3"));
>x; str(x)# step1: parse out to 3 tabs
>x1<-x[x$a == 1,]; x1
>x2<-x[x$a == 2,]; x2
>x3<-x[x$a == 3,]; x3# step2: remove column a in each tab
>x1$a<-NULL; x1
>x2$a<-NULL; x2
>x3$a<-NULL; x3# step3: rename column b to b1, b2 and b3 by y1, y2 and
>y3
>names(x1)[names(x1)=="b"]<-"b_1"; x1
>names(x2)[names(x2)=="b"]<-"b_2"; x2
>names(x3)[names(x3)=="b"]<-"b_3"; x3# setp4: set x1, x3 and x3 together
>x123=cbind(x1,x2,x3); x123
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>
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