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"Teresa Nelson" < [hidden email]> writes:
> Hi there,
>
>
>
> I can get the for-loop to work, I can get the while loop to work. But I
> can't get a for loop to work nested within the while loop - why?
>
What do you mean it doesn't work??
I get:
>
> results
[,1] [,2]
[1,] 1 25
[2,] 2 50
[3,] 3 75
[4,] 4 100
[5,] 5 125
[6,] 6 150
[7,] 7 175
[8,] 8 200
[9,] 9 225
[10,] 10 250
[11,] 11 275
[12,] 12 300
[13,] 0 0
...
[107,] 0 0
[108,] 108 300
[109,] 0 0
[110,] 110 275
[111,] 0 0
[112,] 0 0
[113,] 0 0
[114,] 0 0
[115,] 0 0
[116,] 0 0
[117,] 0 0
[118,] 0 0
[119,] 0 0
[120,] 120 300
If that's not what you expected, then you need to adjust your
expectations. Notice that your k's are effectively
> outer(1:12,1:10)
[,1] [,2] [,3] [,4] [,5] [,6] [,7] [,8] [,9] [,10]
[1,] 1 2 3 4 5 6 7 8 9 10
[2,] 2 4 6 8 10 12 14 16 18 20
[3,] 3 6 9 12 15 18 21 24 27 30
[4,] 4 8 12 16 20 24 28 32 36 40
[5,] 5 10 15 20 25 30 35 40 45 50
[6,] 6 12 18 24 30 36 42 48 54 60
[7,] 7 14 21 28 35 42 49 56 63 70
[8,] 8 16 24 32 40 48 56 64 72 80
[9,] 9 18 27 36 45 54 63 72 81 90
[10,] 10 20 30 40 50 60 70 80 90 100
[11,] 11 22 33 44 55 66 77 88 99 110
[12,] 12 24 36 48 60 72 84 96 108 120
and that in that table some numbers occur up to five times and others
not at all.
>
> Please help,
>
> Teresa
>
>
> # Why doesn't this nested loop work?
>
> n.max <- 300
> NUM <- 25
>
> n.sim <- 10
> j <- (n.max/NUM)*n.sim
>
> results <- matrix(0, nrow=j, ncol=2)
>
> while(NUM <= n.max){
>
> for(i in 1:n.sim){
>
> k <- (NUM/25)*i
>
> results[k,1] <- k
> results[k,2] <- NUM
>
> }
>
> NUM <- NUM + 25
>
> }
>
> results
>
> #### TRY WHILE LOOP ONLY
>
> results <- matrix(0, nrow=12, ncol=2)
>
> n.max <- 300
> NUM <- 25
>
> while(NUM <= n.max){
>
> k <- NUM/25
>
> results[k,1] <- k
> results[k,2] <- NUM
>
> NUM <- NUM + 25
>
> }
>
> results
>
> # It works, here are the results
>
> # [,1] [,2]
> # [1,] 1 25
> # [2,] 2 50
> # [3,] 3 75
> # [4,] 4 100
> # [5,] 5 125
> # [6,] 6 150
> # [7,] 7 175
> # [8,] 8 200
> # [9,] 9 225
> #[10,] 10 250
> #[11,] 11 275
> #[12,] 12 300
>
>
>
> ### Try For Loop Only
>
> n.sim <- 10
> NUM <- 25
>
> results <- matrix(0, nrow=10, ncol=2)
>
> for(i in 1:n.sim){
>
> results[i,1] <- i
> results[i,2] <- NUM
>
> }
>
> results
>
> # it works, here are the results
> # [,1] [,2]
> # [1,] 1 25
> # [2,] 2 25
> # [3,] 3 25
> # [4,] 4 25
> # [5,] 5 25
> # [6,] 6 25
> # [7,] 7 25
> # [8,] 8 25
> # [9,] 9 25
> #[10,] 10 25
> ______________________________________________
> [hidden email] mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help> PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html--
O__ ---- Peter Dalgaard Øster Farimagsgade 5, Entr.B
c/ /'_ --- Dept. of Biostatistics PO Box 2099, 1014 Cph. K
(*) \(*) -- University of Copenhagen Denmark Ph: (+45) 35327918
~~~~~~~~~~ - ( [hidden email]) FAX: (+45) 35327907
______________________________________________
[hidden email] mailing list
https://stat.ethz.ch/mailman/listinfo/r-helpPLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
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Teresa Nelson
> Hi there,
>
>
>
> I can get the for-loop to work, I can get the while loop to work. But
I
> can't get a for loop to work nested within the while loop - why?
>
>
>
> Please help,
>
> Teresa
It actually does work, but I think the problem is with your matrix
indexing. See the sample below.
You could also check out ?seq, ?rep, and ?apply for solving this problem
with fewer lines of code.
n.max <- 300
NUM <- 25
n.sim <- 10
j <- (n.max/NUM)*n.sim
results <- matrix(0, nrow=j, ncol=2)
while(NUM <= n.max){
for(i in 1:n.sim){
k <- (NUM/25)*i
results[((NUM / 25) - 1) * n.sim + i, 1] <- k
results[((NUM / 25) - 1) * n.sim + i, 2] <- NUM
cat("Iteration", i, ": NUM=", NUM, "k=", k, "\n")
}
NUM <- NUM + 25
}
This email message, including any attachments, is for the so...{{dropped}}
______________________________________________
[hidden email] mailing list
https://stat.ethz.ch/mailman/listinfo/r-helpPLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
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Is this what you are searching for?
n.max <- 300
NUM <- 25
id<-0
n.sim <- 10
j <- (n.max/NUM)*n.sim
results <- matrix(0, nrow=j, ncol=2)
while(NUM <= n.max){
for(i in 1:n.sim){
k <- (NUM/25)*i
id<-id+1
results[id,1] <- k
results[id,2] <- NUM
}
NUM <- NUM + 25
}
results
<<<
If not, plase give an example how you would like the results to look like!
Best,
Ales Ziberna
-----Original Message-----
From: [hidden email]
[mailto: [hidden email]] On Behalf Of Teresa Nelson
Sent: Wednesday, January 04, 2006 4:44 PM
To: [hidden email]
Subject: [R] Why doesn't this nested loop work?
Hi there,
I can get the for-loop to work, I can get the while loop to work. But I
can't get a for loop to work nested within the while loop - why?
Please help,
Teresa
______________________________________________
[hidden email] mailing list
https://stat.ethz.ch/mailman/listinfo/r-helpPLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
|
|
|
Hello there,
Thanks to everyone that responded. Thank-you Eric for showing me MY ALGEBRA
ERROR! Geesh! I apologize.
Again - thank-you,
Teresa
-----Original Message-----
From: Kort, Eric [mailto: [hidden email]]
Sent: Wednesday, January 04, 2006 10:12 AM
To: Teresa Nelson; [hidden email]
Subject: RE: [R] Why doesn't this nested loop work?
Teresa Nelson
> Hi there,
>
>
>
> I can get the for-loop to work, I can get the while loop to work. But
I
> can't get a for loop to work nested within the while loop - why?
>
>
>
> Please help,
>
> Teresa
It actually does work, but I think the problem is with your matrix
indexing. See the sample below.
You could also check out ?seq, ?rep, and ?apply for solving this problem
with fewer lines of code.
n.max <- 300
NUM <- 25
n.sim <- 10
j <- (n.max/NUM)*n.sim
results <- matrix(0, nrow=j, ncol=2)
while(NUM <= n.max){
for(i in 1:n.sim){
k <- (NUM/25)*i
results[((NUM / 25) - 1) * n.sim + i, 1] <- k
results[((NUM / 25) - 1) * n.sim + i, 2] <- NUM
cat("Iteration", i, ": NUM=", NUM, "k=", k, "\n")
}
NUM <- NUM + 25
}
This email message, including any attachments, is for the so...{{dropped}}
______________________________________________
[hidden email] mailing list
https://stat.ethz.ch/mailman/listinfo/r-helpPLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
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Locked
nested_loop_question.txt (1K)