How to save output of for loop in a vector form

Question

n <- as.numeric(n)
b <- c()
for (i in 2:(n-1))
{ 
  a <-   (n%%i) 
  if (a==0) {
   b <-  print(i)
  }

}

ouput

 n <- readline(prompt = "Enter the value of n:")
Enter the value of n:10

> n <- as.numeric(n)

> b <- c()

> for (i in 2:(n-1))
+ { 
+   a <-   (n%%i) 
+   if (a==0) {
+    b <-  print(i)
+   }
+   
+ }
[1] 2
[1] 5

I want my output in vector form. I am not sure what to do.I ve tried this one method I saw in other answers but couldnt succeed .

b <- c(b,i) perhaps (instead of your line with print(b) in it)? — Andrew Gustar
– Andrew Gustar, Commented Oct 14, 2019 at 16:01

Federico Cattai · Accepted Answer · 2019-10-14 16:04:14Z

3

if you want to store results inside b vector, try this example:

n <- 10
b <- c()

for (i in 2:(n-1)){ 
  a <-   (n%%i) 
  if (a==0) {
    b <- c(b, i)
  }
}

answered Oct 14, 2019 at 16:04

Federico Cattai

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Comments

cbo · Accepted Answer · 2019-10-15 09:05:16Z

2

EDIT : (the previous code didn't fully retake your question)

You can also (ab)use the fact that %% as most base function is Vectorized :

n <- 10
result <- n %% 2:(n-1)
# to get index
which(result == 0)
#> [1] 1 4
# to get numbers
(2:(n-1))[which(result == 0)]
#> [1] 2 5

edited Oct 15, 2019 at 9:05

answered Oct 14, 2019 at 16:16

cbo

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