R编程循环

Question

I am just starting the R program. I have couple of questions. I want to create for loop. For example; I created like this. But I want to, loop created every x value,

result = result + 2*n+1 
for x = -1 result = 0
for x = 0 result = 0
for x = 1 result = 3
for x = 2 result = 6
# etc, until
x = 9 result = 27


result = 0
vector<-c(-1:9)
for (x in vector){
  print(x)
  x = x+1
  n = as.integer(1)
  if (x<=0){
    result= 1
  } else{
    result = result + 2*n+1
  }
}
print(result)

Answer 1

Is this it? The special cases for x <= 0 force the code to predict the special case when x already is above 0 , meaning, x == 1 .

n <- 1
vector <- -1:9
for (x in vector){
  cat("x:", x, "\t")
  if (x <= 0){
    result <- 1
  } else{
    if(x == 1) result <- 0
    result <- result + 2*n + 1
  }
  cat("result:", result, "\n")
}
#x: -1  result: 1 
#x: 0   result: 1 
#x: 1   result: 3 
#x: 2   result: 6 
#x: 3   result: 9 
#x: 4   result: 12 
#x: 5   result: 15 
#x: 6   result: 18 
#x: 7   result: 21 
#x: 8   result: 24 
#x: 9   result: 27