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 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)
>> print(DataFrame1)
>> colnames(DataFrame1) <- Colnames1
>> print(DataFrame1)
>> The results I get are:
>>(A)(B)(C)
>> [1,] 0.4739417 1.3138868 0.4262165
>> [2,] -2.1288083 1.0333770 1.1543404
>> [3,] -0.3401786 -0.7023236 -0.2336880
>>X.A. X.B. X.C.
>> 1 0.4739417 1.3138868 0.4262165
>> 2 -2.1288083 1.0333770 1.1543404
>> 3 -0.3401786 -0.7023236 -0.2336880
>> (A)(B)(C)
>> 1 0.4739417 1.3138868 0.4262165
>> 2 -2.1288083 1.0333770 1.1543404
>> 3 -0.3401786 -0.7023236 -0.2336880
>> so that when I make the matrix with headings the parentheses are replaced by
>> periods but I can add them after creating the data frame and the column
>> headings are correct.
>> Any ideas on why this occurs?
>
> By default, data.frame() uses names that are legal variable names, so you can
> do things like Data1$X.A. You can stop this change by saying
>
> DataFrame1 <- data.frame(Data1, check.names=FALSE)
>
> Duncan Murdoch
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Re: [R] Col names in a data frame
Thanks - I had seen that parameter but did not think the ( would be illegal but
now I understand why it considers it illegal.
Thanks again
Bernard
Sent from my iPhone so please excuse the spelling!"
> On Jan 21, 2021, at 4:14 PM, Duncan Murdoch wrote:
>
> On 21/01/2021 3:58 p.m., Bernard McGarvey wrote:
>> Here is an example piece of code to illustrate an issue:
>> rm(list=ls()) # Clear Workspace
>> #
>> Data1 <- matrix(data=rnorm(9,0,1),nrow=3,ncol=3)
>> Colnames1 <- c("(A)","(B)","(C)")
>> colnames(Data1) <- Colnames1
>> print(Data1)
>> DataFrame1 <- data.frame(Data1)
>> print(DataFrame1)
>> colnames(DataFrame1) <- Colnames1
>> print(DataFrame1)
>> The results I get are:
>> (A)(B)(C)
>> [1,] 0.4739417 1.3138868 0.4262165
>> [2,] -2.1288083 1.0333770 1.1543404
>> [3,] -0.3401786 -0.7023236 -0.2336880
>> X.A. X.B. X.C.
>> 1 0.4739417 1.3138868 0.4262165
>> 2 -2.1288083 1.0333770 1.1543404
>> 3 -0.3401786 -0.7023236 -0.2336880
>> (A)(B)(C)
>> 1 0.4739417 1.3138868 0.4262165
>> 2 -2.1288083 1.0333770 1.1543404
>> 3 -0.3401786 -0.7023236 -0.2336880
>> so that when I make the matrix with headings the parentheses are replaced by
>> periods but I can add them after creating the data frame and the column
>> headings are correct.
>> Any ideas on why this occurs?
>
> By default, data.frame() uses names that are legal variable names, so you can
> do things like Data1$X.A. You can stop this change by saying
>
> DataFrame1 <- data.frame(Data1, check.names=FALSE)
>
> Duncan Murdoch
__
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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 the check.names parameter to
switch this on / off, but for other classes this checking doesn't
seem to be provided.
Perhaps the idea behind this discrepancy is to enable the use of
the $ operator to access columns of the data frame, while that's
not possible for matrices anyway. (Personally, I don't find the
results of make.names that useful, though, and I tend to sanitise
them myself when working with data frames with unwieldy column
names).
Best regards, Jan
On Thu, Jan 21, 2021 at 03:58:44PM -0500, 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)
> print(DataFrame1)
> colnames(DataFrame1) <- Colnames1
> print(DataFrame1)
>
> The results I get are:
>
> (A)(B)(C)
> [1,] 0.4739417 1.3138868 0.4262165
> [2,] -2.1288083 1.0333770 1.1543404
> [3,] -0.3401786 -0.7023236 -0.2336880
> X.A. X.B. X.C.
> 1 0.4739417 1.3138868 0.4262165
> 2 -2.1288083 1.0333770 1.1543404
> 3 -0.3401786 -0.7023236 -0.2336880
> (A)(B)(C)
> 1 0.4739417 1.3138868 0.4262165
> 2 -2.1288083 1.0333770 1.1543404
> 3 -0.3401786 -0.7023236 -0.2336880
>
> so that when I make the matrix with headings the parentheses are replaced by
> periods but I can add them after creating the data frame and the column
> headings are correct.
>
> Any ideas on why this occurs?
>
> Thanks
>
>
> Bernard McGarvey
> Director, Fort Myers Beach Lions Foundation, Inc.
> Retired (Lilly Engineering Fellow).
>
> __
> R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see
> 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.
__
R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see
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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
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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
valid variable names and are not duplicated. If necessary
they are adjusted (by ‘make.names’) so that they are.
Sarah
On Thu, Jan 21, 2021 at 3:59 PM 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)
> print(DataFrame1)
> colnames(DataFrame1) <- Colnames1
> print(DataFrame1)
>
> The results I get are:
>
> (A)(B)(C)
> [1,] 0.4739417 1.3138868 0.4262165
> [2,] -2.1288083 1.0333770 1.1543404
> [3,] -0.3401786 -0.7023236 -0.2336880
> X.A. X.B. X.C.
> 1 0.4739417 1.3138868 0.4262165
> 2 -2.1288083 1.0333770 1.1543404
> 3 -0.3401786 -0.7023236 -0.2336880
> (A)(B)(C)
> 1 0.4739417 1.3138868 0.4262165
> 2 -2.1288083 1.0333770 1.1543404
> 3 -0.3401786 -0.7023236 -0.2336880
>
> so that when I make the matrix with headings the parentheses are replaced by
> periods but I can add them after creating the data frame and the column
> headings are correct.
>
> Any ideas on why this occurs?
>
> Thanks
>
>
> Bernard McGarvey
> Director, Fort Myers Beach Lions Foundation, Inc.
> Retired (Lilly Engineering Fellow).
>
--
Sarah Goslee (she/her)
http://www.numberwright.com
__
R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see
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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
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)
print(DataFrame1)
colnames(DataFrame1) <- Colnames1
print(DataFrame1)
The results I get are:
(A)(B)(C)
[1,] 0.4739417 1.3138868 0.4262165
[2,] -2.1288083 1.0333770 1.1543404
[3,] -0.3401786 -0.7023236 -0.2336880
X.A. X.B. X.C.
1 0.4739417 1.3138868 0.4262165
2 -2.1288083 1.0333770 1.1543404
3 -0.3401786 -0.7023236 -0.2336880
(A)(B)(C)
1 0.4739417 1.3138868 0.4262165
2 -2.1288083 1.0333770 1.1543404
3 -0.3401786 -0.7023236 -0.2336880
so that when I make the matrix with headings the parentheses are replaced by
periods but I can add them after creating the data frame and the column
headings are correct.
Any ideas on why this occurs?
By default, data.frame() uses names that are legal variable names, so
you can do things like Data1$X.A. You can stop this change by saying
DataFrame1 <- data.frame(Data1, check.names=FALSE)
Duncan Murdoch
__
R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see
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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
Re: [R] Col names in a data frame
rm(list=ls()) is a bad practice... especially when posting examples. It doesn't
clean out everything and it removes objects created by the user.
Read ?data.frame, particularly regarding the check.names parameter. The intent
is to make it easier to use DF$A notation, though DF$`(A)` is usable if you are
somewhat experienced with R.
On January 21, 2021 12:58:44 PM PST, 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)
>print(DataFrame1)
>colnames(DataFrame1) <- Colnames1
>print(DataFrame1)
>
>The results I get are:
>
>(A)(B)(C)
>[1,] 0.4739417 1.3138868 0.4262165
>[2,] -2.1288083 1.0333770 1.1543404
>[3,] -0.3401786 -0.7023236 -0.2336880
>X.A. X.B. X.C.
>1 0.4739417 1.3138868 0.4262165
>2 -2.1288083 1.0333770 1.1543404
>3 -0.3401786 -0.7023236 -0.2336880
> (A)(B)(C)
>1 0.4739417 1.3138868 0.4262165
>2 -2.1288083 1.0333770 1.1543404
>3 -0.3401786 -0.7023236 -0.2336880
>
>so that when I make the matrix with headings the parentheses are
>replaced by periods but I can add them after creating the data frame
>and the column headings are correct.
>
>Any ideas on why this occurs?
>
>Thanks
>
>
>Bernard McGarvey
>Director, Fort Myers Beach Lions Foundation, Inc.
>Retired (Lilly Engineering Fellow).
>
>__
>R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see
>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.
--
Sent from my phone. Please excuse my brevity.
__
R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see
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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
