Create variable names and assign values in R

Question

My little example is as follows:

x = c(5,1,3)
y = c(-1,3,1)
X = cbind(x,y)

I want to achieve

x1 = X[1,]
y1 = X[2,]
z1 = X[3,]

in a loop. Then I try

x = c(5,1,3)
y = c(-1,3,1)
X = cbind(x,y)
nr = nrow(X)
nc = ncol(X)
for(i in nr){
    k = length(letters)
    get(paste0(letters[k-(nr-i)],1)) = X[i,]
}

But I get a error as

Error in get(paste0(letters[k - (nr - i)], 1)) <- X[i, ] :
could not find function "get<-"

How can fix this issue?

Ronak Shah · Accepted Answer · 2021-04-09 06:59:58Z

3

You might be looking for assign instead of get. However, here is a way to do it without a loop.

list2env(setNames(asplit(X, 1), c('x1', 'y1', 'z1')), .GlobalEnv)

x1
# x  y 
# 5 -1 

y1
#x y 
#1 3 

z1
#x y 
#3 1

Using assign :

x = c(5,1,3)
y = c(-1,3,1)
X = cbind(x,y)
nr = nrow(X)
nc = ncol(X)
k = length(letters)

for(i in 1:nr){
  assign(paste0(letters[k-(nr-i)],1), X[i,])
}

edited Apr 9, 2021 at 6:59

answered Apr 9, 2021 at 3:43

Ronak Shah

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2 Comments

John Stone Over a year ago

Tks! It works! While, as you point out using assign, I change get(paste0(letters[k-(nr-i)],1)) = X[i,] as assign(paste0(letters[k-(nr-i)],1), X[i,]) in my original code, and it still fails @ronak-shah@Ronak Shah

John Stone Over a year ago

Wow, gorgeous! That's I want. Tks!@ronak-shah@Ronak Shah

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