While Loop Question (beginner)

[Madigan94]

Hello,

I'm new to R and still trying to figure out things. One of my homework assignments is to create a While Loop. Here are my instructions:

Create a new rscript file called (exactly) Challenge32C.R. Make sure you save it in the /workspace directory. Write a While Loop statement that prints all numbers to the console from within the while loop from -1 to 1 in .25 increments.

Here is the code I wrote:
#Control Flow -- WHILE LOOP
die1<- -1.25 #set control variable
while (die1<-1.25) { #check condition of control variable
vd1d2<-c((die1+.25),(die1+.5),(die1+.75),(die1+1),(die1+1.25),(die1+1.5),(die1+1.75),(die1+2)) #create vector
print(vd1d2) #print vector as you process each die1
die1<-die1+.25 #increment control variable
}

I know I'm on the right track, but something is off and I have no idea what. I've tried making minor changes but still don't seem closer to the answer. I keep getting the numbers "[1] 1.50 1.75 2.00 2.25 2.50 2.75 3.00 3.25" repeating over and over and over.

Any insight you have, I'd really appreciate. Thank you!

[FJCC]

Look carefully at the condition you have written for the while(). You have

 while( die1 <-  1.25)

Does <- do what you want?

[Madigan94]

Can you explain what you mean? We have an example I'm using to make my own loop. The first line of the While Loop in the example is
die1<-1 #set control variable
so I'm trying to make the same thing here? I'm not sure how I would do it differently.

[Madigan94]

Now I understand the question better, sorry, my mistake.
I've tried changing around the while( die1 <- 1.25) line but I just keep getting answers that are close but not it. I tried 0 and while this was the closest, it didn't give me the correct answer either, so I'm still fairly confused.

[Madigan94]

I'm still trying to work on it, and I've gotten a little further, but I'm still confused.
When I just print the vector, I get the result I want. I don't know why I'm getting the table of numbers?
Here's what I've done

R Script:
#Control Flow -- WHILE LOOP
die1<- -1 #set control variable
while (die1<.25) { #check condition of control variable
vd1d2<-c((die1-1), (die1-.75), (die1-.5), (die1-.25), (die1+0), (die1+.25),(die1+.5),(die1+.75),(die1+1)) #create vector
die1<-die1+.25 #increment control variable
print(vd1d2) #print vector as you process each die1
}

Console output:

#Control Flow -- WHILE LOOP
die1<- -1 #set control variable
while (die1<.25) { #check condition of control variable

• vd1d2<-c((die1-1), (die1-.75), (die1-.5), (die1-.25), (die1+0), (die1+.25),(die1+.5),(die1+.75),(die1+1)) #create vector
• die1<-die1+.25 #increment control variable
• print(vd1d2) #print vector as you process each die1
• }
  [1] -2.00 -1.75 -1.50 -1.25 -1.00 -0.75 -0.50 -0.25 0.00
  [1] -1.75 -1.50 -1.25 -1.00 -0.75 -0.50 -0.25 0.00 0.25
  [1] -1.50 -1.25 -1.00 -0.75 -0.50 -0.25 0.00 0.25 0.50
  [1] -1.25 -1.00 -0.75 -0.50 -0.25 0.00 0.25 0.50 0.75
  [1] -1.00 -0.75 -0.50 -0.25 0.00 0.25 0.50 0.75 1.00

print(vd1d2) #print vector as you process each die1
[1] -1.00 -0.75 -0.50 -0.25 0.00 0.25 0.50 0.75 1.00

[FJCC]

Your original code was quite close to the solution. One error, which you have fixed in the latest code is to use < instead of <- inside of the while(). The second problem, in my opinion, is that you are printing whole vector vd1d2. I think you should print just die1 in each increment of the loop. The following is not quite correct but if you try it, I think you can finish it up on your own.

die1<- -1.25 #set control variable
while (die1 < 1.25) { #check condition of control variable
  vd1d2<-c((die1+.25),(die1+.5),(die1+.75),(die1+1),(die1+1.25),(die1+1.5),(die1+1.75),(die1+2)) #create vector
  #print(vd1d2) #print vector as you process each die1
  print(die1)
  die1 <- die1+.25 #increment control variable
}