for loops and vectors

[captainjjack]

g=integer(5)

for (i in g){

   g[i]=g[i]+1

}

What is wrong with the above code.
I wanted to see g with all 1's but I get g with all zeros

[startz]

g=integer(5)
creates a vector of five zeros. i is then set to zero five times.

[williaml]

You could just do : rep(1, 5).

[captainjjack]

First of all, Thank you!
I understand integer(5) creates 5 zeros
But what about the rest of it?
for (i in g){

   g[i]=g[i]+1

}
That should change it zeros to 1's, correct?

[captainjjack]

Thanks for responding.
The reason for my question is the second part:

for (i in g){

   g[i]=g[i]+1

}
why don't all the g[i] get changed to 1 by the addition equation?
I need the equation to work, but it doesn't.
This seems so simple, and I must be doing something obviously wrong

[startz]

The first time through it says g[0] = 0 + 1. In R indices equal to 0 are ignored. So nothing changes

[FJCC]

Compare these two versions.

g=integer(5)
for (i in g){
   print(paste("i = ", i))
   g[i]=g[i]+1
   
 }
[1] "i =  0"
[1] "i =  0"
[1] "i =  0"
[1] "i =  0"
[1] "i =  0"



g=integer(5)
for (i in seq_along(g)){
   print(paste("i = ", i))
   g[i]=g[i]+1
   
 }
[1] "i =  1"
[1] "i =  2"
[1] "i =  3"
[1] "i =  4"
[1] "i =  5"

g
[1] 1 1 1 1 1

[captainjjack]

Mr. Startz

Thank you!

[captainjjack]

Mr. FJCC

Thank You!

I think I understand now