Run a for loop with two or more variables without using nested loops

Question

I would like to run a for loop with multiple variables which run simultaneously and are not nested.

My code is as follows

for (i, j in c(1,2,3), c("a","b","c")){
print(i)
print(j)
}

I would like this to print out

1
a
2
b
3
c

How can I do this?

akrun · Accepted Answer · 2018-09-09 19:59:40Z

3

We can loop through the sequence of the vectors

for(i in seq_along(x1)) {
        print(x1[i])
        print(y1[i])
  }

It is similar to the option of looping using range in python

x = [1, 2, 3]
y = ['a', 'b', 'c']
for i in range(len(x)):
    print(x[i])
    print(y[i])

data

x1 <- 1:3
y1 <- letters[1:3]

edited Sep 9, 2018 at 19:59

answered Sep 9, 2018 at 19:45

akrun

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1 Comment

I. Mniece Over a year ago

Thank you! I like how it scales to even more variables e.g for(i in seq_along(x1)) {print(x1[i]); print(y1[i]); print(z1) } x1 <- 1:3 y1 <- letters[1:3] z1 <- c("s","t","u")

mikeck · Accepted Answer · 2018-09-09 19:42:47Z

0

Try mapply:

 mapply(function(x, y) {print(x); print(y)}, x = 1:3, y = letters[1:3])

Map does something similar as well.

answered Sep 9, 2018 at 19:42

mikeck

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