Re: [R] Hi , Is it possible select a different number of rows by each group with R????

Hi Marta, If your first dataset "field2" is greater than the number of rows for a particular "field1" in second dataset, this error could happen. e.g. using modified dat1: dat1 <- structure(list(field1 = 1:3, field2 = c(3L, 20L, 4L)), .Names = c("field1", "field2"), class = "data.frame", row.n

Re: [R] Hi , Is it possible select a different number of rows by each group with R????

Hi Marta, If you need random selection, you could use: do.call(rbind,lapply(split(dat2,dat2$field1),function(x) x[sample(1:nrow(x),dat1$field2[!is.na(match(dat1$field1,x$field1))],replace=FALSE),])) A.K. On Tuesday, April 22, 2014 1:45 PM, arun wrote: Hi Marta, It's not clear whether you w

Re: [R] Hi , Is it possible select a different number of rows by each group with R????

Hi Marta, It's not clear whether you wanted to select the first "n" rows specified by field2 in the first dataset or just random rows. ##using a modified example if my guess is correct dat1 <- structure(list(field1 = 1:3, field2 = c(3L, 6L, 4L)), .Names = c("field1", "field2"), class = "data.

Re: [R] Hi , Is it possible select a different number of rows by each group with R????

Tobeña Sent: Monday, April 21, 2014 10:08 AM To: r-help@r-project.org Subject: [R] Hi , Is it possible select a different number of rows by each group with R Hi , Is it possible select a different number of rows by each group with R I must to select different number (specific quantity in

[R] Hi , Is it possible select a different number of rows by each group with R????

Hi , Is it possible select a different number of rows by each group with R I must to select different number (specific quantity in field2:Table1) of rows in each group(field1:Table2). I have these 2 tables:Table1Table2field1field2field1field3field4field51310.375SpRm12610.416667SpRm23910.45833