Re: [R] Col names in a data frame

Thanks - I had seen that parameter but did not think the ( would be illegal but now I understand why it considers it illegal. Thanks again Bernard Sent from my iPhone so please excuse the spelling!" > On Jan 21, 2021, at 4:14 PM, Duncan Murdoch wrote: > > On 21/01/2021 3:58 p.m., Bernard Mc

Re: [R] Col names in a data frame

Thanks - I had seen that parameter but did not think the ( would be illegal but now I understand why it considers it illegal. Thanks again Bernard Sent from my iPhone so please excuse the spelling!" > On Jan 21, 2021, at 4:14 PM, Duncan Murdoch wrote: > > On 21/01/2021 3:58 p.m., Bernard McG

Re: [R] Col names in a data frame

it looks to me that the names are cranked through make.names for data frames case while that doesn't happen for matrices. Peeking into the `colnames<-` code supports this idea, but that in turn uses `names<-` which is a primitive and so defies further easy peeking. The data.frame function provides

Re: [R] Col names in a data frame

Hi, data.frame() checks names by default to ensure that column names are legal, but there's an argument to change that. >From ?data.frame() check.names: logical. If ‘TRUE’ then the names of the variables in the data frame are checked to ensure that they are syntactically va

Re: [R] Col names in a data frame

On 21/01/2021 3:58 p.m., Bernard McGarvey wrote: Here is an example piece of code to illustrate an issue: rm(list=ls()) # Clear Workspace # Data1 <- matrix(data=rnorm(9,0,1),nrow=3,ncol=3) Colnames1 <- c("(A)","(B)","(C)") colnames(Data1) <- Colnames1 print(Data1) DataFrame1 <- data.frame(Data1)

Re: [R] Col names in a data frame

rm(list=ls()) is a bad practice... especially when posting examples. It doesn't clean out everything and it removes objects created by the user. Read ?data.frame, particularly regarding the check.names parameter. The intent is to make it easier to use DF$A notation, though DF$`(A)` is usable if

[R] Col names in a data frame

Here is an example piece of code to illustrate an issue: rm(list=ls()) # Clear Workspace # Data1 <- matrix(data=rnorm(9,0,1),nrow=3,ncol=3) Colnames1 <- c("(A)","(B)","(C)") colnames(Data1) <- Colnames1 print(Data1) DataFrame1 <- data.frame(Data1) print(DataFrame1) colnames(DataFrame1) <- Colnames