For Loop in R: Error in y[[j]] : subscript out of bounds

Question

I am trying to calculate a value and insert the result into a results list. Next, I'd like to use the previous result as an input, run calculation using previous result, and insert into new result into the results list.

x = seq(1,10, by = 1)

y = list()

i = 2

j = 1

for(i in 1:10){

y[i] = (x[i] - y[[j]])/2

i = i +1

j = j + 1
}

Answer 1

Do you mean this ? :

x = seq(1, 10, by = 1)
y = list()
i = 2
j = 1
for(i in 1:10){
    y[[i]] = (x[i] - y[[j]])/2
    # i = i+1 unnecesary 
    j = j + 1 
}

As others advised this led to error due to uninitialized list.

Now works, but is kinda strange:

x = seq(1, 10, by = 1)
y = list()
i = 2
j = 1

# initialize y with random stuff
for(i in 1:10){
    y[[i]] = rnorm(5) # fill with 5 random values
}

for(i in 1:10){
    y[[i]] = (x[i] - y[[j]])/2
    # i = i+1 unnecesary 
    j = j + 1 
}

Please note that i = 2 is meaningless since its value is overriden by both loop indexes, which are named the same.