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Muhuri, Pradip (SAMHSA/CBHSQ)

2012-Nov-24 02:55 UTC

[R] subsetting - questions

Hello,

I have two very basic questions (console attached):

1) What am I getting an error message for  # 5 and # 7 ?
2) How to fix the code?

I would appreciate receiving your help.

Thanks,

Pradip Muhuri



###### Reproducible Example  #####

N <- 100
set.seed(13)
df<-data.frame(matrix(sample(c(1:10),N, replace=TRUE),ncol=5))

keep_var <- c("X1", "X2")
drop_var <- c("X3", "X4", "X5")


df[df$X1>=8,] [,1:2]                   #1
df[df$X1>=8,] [,-c(3,4,5)]             #2
df[df$X1>=8,] [,c(-3,-4,-5)]           #3
df[df$X1>=8,] [,c("X1", "X2")]         #4
df[df$X1>=8,] [,-c("X3", "X4", "X5")]  #5  DOES
NOT WORK
df[df$X1>=8,] [,keep_var]              #6
df[df$X1>=8,] [, !drop_var]            #7   DOES NOT WORK

Jorge I Velez

2012-Nov-24 03:02 UTC

head link

[R] subsetting - questions

Hi Pradip,

It is easier to use subset().  Check ?subset for some examples and pay
special attention to the "select" parameter.  By the way, do not call
your data
"df" as it is already a function.

Best,
Jorge.-


On Sat, Nov 24, 2012 at 1:55 PM, Muhuri, Pradip (SAMHSA/CBHSQ) <> wrote:
>
> Hello,
>
> I have two very basic questions (console attached):
>
> 1) What am I getting an error message for  # 5 and # 7 ?
> 2) How to fix the code?
>
> I would appreciate receiving your help.
>
> Thanks,
>
> Pradip Muhuri
>
>
>
> ###### Reproducible Example  #####
>
> N <- 100
> set.seed(13)
> df<-data.frame(matrix(sample(c(1:10),N, replace=TRUE),ncol=5))
>
> keep_var <- c("X1", "X2")
> drop_var <- c("X3", "X4", "X5")
>
>
> df[df$X1>=8,] [,1:2]                   #1
> df[df$X1>=8,] [,-c(3,4,5)]             #2
> df[df$X1>=8,] [,c(-3,-4,-5)]           #3
> df[df$X1>=8,] [,c("X1", "X2")]         #4
> df[df$X1>=8,] [,-c("X3", "X4", "X5")]  #5 
DOES NOT WORK
> df[df$X1>=8,] [,keep_var]              #6
> df[df$X1>=8,] [, !drop_var]            #7   DOES NOT WORK
>
> ______________________________________________
> R-help@r-project.org mailing list
> 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.
>
	[[alternative HTML version deleted]]

arun

2012-Nov-24 03:15 UTC

head link

[R] subsetting - questions

HI,
This should work:
df[df$X1>=8,][-which(names(df)%in%
c("X3","X4","X5"))]
#?? X1 X2
#1?? 8? 2
#5? 10? 1
#8?? 8? 5
#9?? 9? 4
#12? 9? 5
#13? 9 10
#19? 9? 8
?df[df$X1>=8,][,!names(df)%in%drop_var]
#?? X1 X2
#1?? 8? 2
#5? 10? 1
#8?? 8? 5
#9?? 9? 4
#12? 9? 5
#13? 9 10
#19? 9? 8
A.K.




----- Original Message -----
From: "Muhuri, Pradip (SAMHSA/CBHSQ)" <Pradip.Muhuri at
samhsa.hhs.gov>
To: "r-help at r-project.org" <r-help at r-project.org>
Cc: 
Sent: Friday, November 23, 2012 9:55 PM
Subject: [R] subsetting - questions


Hello,

I have two very basic questions (console attached):

1) What am I getting an error message for? # 5 and # 7 ?
2) How to fix the code?

I would appreciate receiving your help.

Thanks,

Pradip Muhuri



###### Reproducible Example? #####

N <- 100
set.seed(13)
df<-data.frame(matrix(sample(c(1:10),N, replace=TRUE),ncol=5))

keep_var <- c("X1", "X2")
drop_var <- c("X3", "X4", "X5")


df[df$X1>=8,] [,1:2]? ? ? ? ? ? ? ? ?  #1
df[df$X1>=8,] [,-c(3,4,5)]? ? ? ? ? ?  #2
df[df$X1>=8,] [,c(-3,-4,-5)]? ? ? ? ?  #3
df[df$X1>=8,] [,c("X1", "X2")]? ? ? ?  #4
df[df$X1>=8,] [,-c("X3", "X4", "X5")]? #5? DOES
NOT WORK
df[df$X1>=8,] [,keep_var]? ? ? ? ? ? ? #6
df[df$X1>=8,] [, !drop_var]? ? ? ? ? ? #7?  DOES NOT WORK

______________________________________________
R-help at r-project.org mailing list
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.

Muhuri, Pradip (SAMHSA/CBHSQ)

2012-Nov-24 03:42 UTC

head link

[R] subsetting - questions

Hi Arun,

Thank you so much for your help.

Pradip
________________________________________
From: arun [smartpink111 at yahoo.com]
Sent: Friday, November 23, 2012 10:15 PM
To: Muhuri, Pradip (SAMHSA/CBHSQ)
Cc: R help
Subject: Re: [R] subsetting - questions

HI,
This should work:
df[df$X1>=8,][-which(names(df)%in%
c("X3","X4","X5"))]
#   X1 X2
#1   8  2
#5  10  1
#8   8  5
#9   9  4
#12  9  5
#13  9 10
#19  9  8
 df[df$X1>=8,][,!names(df)%in%drop_var]
#   X1 X2
#1   8  2
#5  10  1
#8   8  5
#9   9  4
#12  9  5
#13  9 10
#19  9  8
A.K.




----- Original Message -----
From: "Muhuri, Pradip (SAMHSA/CBHSQ)" <Pradip.Muhuri at
samhsa.hhs.gov>
To: "r-help at r-project.org" <r-help at r-project.org>
Cc:
Sent: Friday, November 23, 2012 9:55 PM
Subject: [R] subsetting - questions


Hello,

I have two very basic questions (console attached):

1) What am I getting an error message for  # 5 and # 7 ?
2) How to fix the code?

I would appreciate receiving your help.

Thanks,

Pradip Muhuri



###### Reproducible Example  #####

N <- 100
set.seed(13)
df<-data.frame(matrix(sample(c(1:10),N, replace=TRUE),ncol=5))

keep_var <- c("X1", "X2")
drop_var <- c("X3", "X4", "X5")


df[df$X1>=8,] [,1:2]?                  #1
df[df$X1>=8,] [,-c(3,4,5)]?            #2
df[df$X1>=8,] [,c(-3,-4,-5)]?          #3
df[df$X1>=8,] [,c("X1", "X2")]?        #4
df[df$X1>=8,] [,-c("X3", "X4", "X5")]? #5  DOES
NOT WORK
df[df$X1>=8,] [,keep_var]?             #6
df[df$X1>=8,] [, !drop_var]?           #7   DOES NOT WORK

______________________________________________
R-help at r-project.org mailing list
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.

Peter Ehlers

2012-Nov-24 03:47 UTC

head link

[R] subsetting - questions

On 2012-11-23 18:55, Muhuri, Pradip (SAMHSA/CBHSQ)
wrote:>
> Hello,
>
> I have two very basic questions (console attached):
>
> 1) What am I getting an error message for  # 5 and # 7 ?
> 2) How to fix the code?
>
> I would appreciate receiving your help.
>
> Thanks,
>
> Pradip Muhuri
>
>
>
> ###### Reproducible Example  #####
>
> N <- 100
> set.seed(13)
> df<-data.frame(matrix(sample(c(1:10),N, replace=TRUE),ncol=5))
>
> keep_var <- c("X1", "X2")
> drop_var <- c("X3", "X4", "X5")
>
>
> df[df$X1>=8,] [,1:2]                   #1
> df[df$X1>=8,] [,-c(3,4,5)]             #2
> df[df$X1>=8,] [,c(-3,-4,-5)]           #3
> df[df$X1>=8,] [,c("X1", "X2")]         #4
> df[df$X1>=8,] [,-c("X3", "X4", "X5")]  #5 
DOES NOT WORK
> df[df$X1>=8,] [,keep_var]              #6
> df[df$X1>=8,] [, !drop_var]            #7   DOES NOT WORK
To see what's wrong, just print the problematic part:

    -c("X3", "X4", "X5")

You can't negate a character vector; you have to have a numeric vector.

And

    !drop_var

doesn't work because you need something that evaluates to a logical
value if you want to "!" it.

This will do it:

    df[df$X1>=8,] [, !names(df) %in% drop_var]

Or use the subset() function, as Jorge suggests.

Peter Ehlers

Muhuri, Pradip (SAMHSA/CBHSQ)

2012-Nov-24 05:02 UTC

head link

[R] subsetting - questions

Hi Jorge,

I could use subset(). But, I wanted to minimize coding.

Thanks,

Pradip
________________________________________
From: Jorge I Velez [jorgeivanvelez at gmail.com]
Sent: Friday, November 23, 2012 10:02 PM
To: Muhuri, Pradip (SAMHSA/CBHSQ)
Cc: r-help at r-project.org
Subject: Re: [R] subsetting - questions

Hi Pradip,

It is easier to use subset().  Check ?subset for some examples and pay special
attention to the "select" parameter.  By the way, do not call your
data "df" as it is already a function.

Best,
Jorge.-


On Sat, Nov 24, 2012 at 1:55 PM, Muhuri, Pradip (SAMHSA/CBHSQ) <> wrote:

Hello,

I have two very basic questions (console attached):

1) What am I getting an error message for  # 5 and # 7 ?
2) How to fix the code?

I would appreciate receiving your help.

Thanks,

Pradip Muhuri



###### Reproducible Example  #####

N <- 100
set.seed(13)
df<-data.frame(matrix(sample(c(1:10),N, replace=TRUE),ncol=5))

keep_var <- c("X1", "X2")
drop_var <- c("X3", "X4", "X5")


df[df$X1>=8,] [,1:2]                   #1
df[df$X1>=8,] [,-c(3,4,5)]             #2
df[df$X1>=8,] [,c(-3,-4,-5)]           #3
df[df$X1>=8,] [,c("X1", "X2")]         #4
df[df$X1>=8,] [,-c("X3", "X4", "X5")]  #5  DOES
NOT WORK
df[df$X1>=8,] [,keep_var]              #6
df[df$X1>=8,] [, !drop_var]            #7   DOES NOT WORK

______________________________________________
R-help at r-project.org<mailto:R-help at r-project.org> mailing list
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.

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