how to add a new column in R with a defined name

[lfa...@ucdavis.edu]

how to add a new column in R with a defined name 

[Brandon Hurr]

What have you tried?

What do you want to put in the new column?

B

On Sun, Sep 25, 2016 at 14:53 <lfa...@ucdavis.edu> wrote:

how to add a new column in R with a defined name 

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[Michael Hannon]

You don't say exactly what you're adding the column to, but see below
for my guess:

> x <- data.frame(even=c(2, 4, 6), odd=c(1, 3, 5))
> x
even odd
1 2 1
2 4 3
3 6 5
> x <- data.frame(even=c(2, 4, 6), odd=c(1, 3, 5))
> x
even odd
1 2 1
2 4 3
3 6 5
> x$new <- c(4, 16, 25)
> x
even odd new
1 2 1 4
2 4 3 16
3 6 5 25

On Sun, Sep 25, 2016 at 2:53 PM, <lfa...@ucdavis.edu> wrote:
> how to add a new column in R with a defined name
>

[Laila Fayyaz]

Hi, 

I want to make a new column in trees and I want  to rename it as BD. I succeeded to make a new column as V4 but  I want to rename it as DB. I have attached a screen shot as well. 

thanks   

On Sun, Sep 25, 2016 at 3:13 PM, Brandon Hurr <brando...@gmail.com> wrote:

What have you tried?

What do you want to put in the new column?

B

On Sun, Sep 25, 2016 at 14:53 <lfa...@ucdavis.edu> wrote:

how to add a new column in R with a defined name 

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Check out our R resources at http://d-rug.github.io/
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Laila Fayyaz

Viticulture and Enology- Walker lab

University of California

Davis, CA, 95616

2128 RMI North

595 Hilgard Lane

[Katherine Ransom]

Just do trees$BD <- trees$Girth* pi to create the column with the correct name ( it will automatically be located last). This prevents having to rename. To rename the column you can also do names(trees)[4] <-  "BD"

[Brandon Hurr]

Katherine's right. It's two steps if you don't do it right the first time. 

Alternatively, in the tidyverse:

library(tidyverse) # install.packages("tidyverse") if you don't have it

trees %>%

mutate(BD = Girth * pi)

HTH,

B

[Laila Fayyaz]

Thank- you 

It works pretty well. 

 

On Sun, Sep 25, 2016 at 3:29 PM, Katherine Ransom <lockhart....@gmail.com> wrote:

[Laila Fayyaz]

Thank-you