[R] nested for loop with data table
PIKAL Petr
petr.pikal at precheza.cz
Thu May 4 08:52:43 CEST 2017
Hi
better to present us your data by dput, so they can be directly used.
> dput(dat)
dat <- structure(list(Num = 1:20, Color = structure(c(5L, 2L, 2L, 1L,
4L, 3L, 3L, 3L, 3L, 3L, 1L, 2L, 1L, 2L, 1L, 2L, 1L, 4L, 4L, 4L
), .Label = c("black", "green", "orange", "red", "yellow"), class = "factor"),
Grade = structure(c(1L, 2L, 1L, 1L, 3L, 4L, 5L, 6L, 6L, 6L,
1L, 2L, 1L, 1L, 3L, 4L, 5L, 6L, 6L, 6L), .Label = c("A",
"B", "C", "D", "E", "F"), class = "factor"), value = c(20L,
25L, 10L, 17L, 5L, 0L, 12L, 11L, 99L, 70L, 77L, 87L, 79L,
68L, 90L, 79L, 101L, 90L, 112L, 101L), Month = structure(c(8L,
7L, 1L, 2L, 3L, 5L, 5L, 4L, 6L, 8L, 7L, 1L, 2L, 3L, 5L, 5L,
4L, 6L, 4L, 6L), .Label = c("April", "August", "December",
"February", "January", "July", "June", "May"), class = "factor"),
Day = c(1L, 2L, 3L, 3L, 5L, 13L, 5L, 8L, 23L, 7L, 11L, 33L,
9L, 14L, 31L, 11L, 17L, 21L, 13L, 20L)), .Names = c("Num",
"Color", "Grade", "value", "Month", "Day"), class = "data.frame", row.names = c(NA,
-20L))
>
I do not know your exact intention and data.table commands. You can get some summary numbers simply by
table(dat$Grade[dat$Num<10 & dat$Day<10])
A B C D E F
3 1 1 0 1 1
It is probably preferable to obtain logical vectors for Num and Day before starting tabulation.
Cheers
Petr
> -----Original Message-----
> From: R-help [mailto:r-help-bounces at r-project.org] On Behalf Of Ek Esawi
> Sent: Wednesday, May 3, 2017 5:17 PM
> To: r-help at r-project.org
> Subject: Re: [R] nested for loop with data table
>
> Thank you both Boris and Jim. Thank you, Boris, for advising to read the
> posting guide; I had and I just did.
>
> Jim’s idea is exactly what I want; however, I could not pass sset1, sset2, etc.
> to the j nested loop and collect the results in an vector.
>
> Here attached my code, file, and my question which should be clear now.
> The question again is instead of using separate loops for each sset1 and
> sset2, I want one nested loop? Because I have at least 10 subsets
> (sset1,sset2,sset3…..sset10).
>
> Thanks again, EK
>
>
> -------The code------
>
> install.packages("data.table")
> library(data.table)
> File1 <- "C:/Users/SampleData.csv"
> DT <- fread(File1)
> sset1 <- DT[Num<10&Day<10]
> sset2 <- DT[Num>10&Day<15]
>
> # Count how many combinations of A,B,C,D,E,F in each subset for ( i in
> 1:length(sset1)){
> aa <- c(sset1[Grade=="A",.N],sset1[Grade=="D",.N])
> bb <- c(sset1[Grade=="B",.N],sset1[Grade=="F",.N])
> cc <- c(sset1[Grade=="C",.N],sset1[Grade=="A",.N])
> counts <- c(aa, bb,cc)
> }
>
> for ( i in 1:length(sset2)){
> aa1 <- c(sset2[Grade=="A",.N],sset2[Grade=="D",.N])
> bb1 <- c(sset2[Grade=="B",.N],sset2[Grade=="F",.N])
> cc1 <- c(sset2[Grade=="C",.N],sset2[Grade=="A",.N])
> counts <- c(aa1,bb1,cc1)
> }
>
> -----------The File------------
>
> Num Color Grade Value Month Day
> 1: 1 yellow A 20 May 1
> 2: 2 green B 25 June 2
> 3: 3 green A 10 April 3
> 4: 4 black A 17 August 3
> 5: 5 red C 5 December 5
> 6: 6 orange D 0 January 13
> 7: 7 orange E 12 January 5
> 8: 8 orange F 11 February 8
> 9: 9 orange F 99 July 23
> 10: 10 orange F 70 May 7
> 11: 11 black A 77 June 11
> 12: 12 green B 87 April 33
> 13: 13 black A 79 August 9
> 14: 14 green A 68 December 14
> 15: 15 black C 90 January 31
> 16: 16 green D 79 January 11
> 17: 17 black E 101 February 17
> 18: 18 red F 90 July 21
> 19: 19 red F 112 February 13
> 20: 20 red F 101 July 20
>
> On Tue, May 2, 2017 at 12:35 PM, Ek Esawi <esawiek at gmail.com> wrote:
>
> > I have a huge data file; a sample is listed below. I am using the
> > package data table to process the file and I am stuck on one issue and
> > need some feedback. I used fread to create a data table. Then I
> > divided the data table (named File1) into 10 general subsets using
> > common table commands such as:
> >
> >
> >
> > AAA <- File1[Num<5&day>15]
> >
> > BBB <- File1[Num>15&day<10]
> >
> > …..
> >
> > …..
> >
> > …..
> >
> > …..
> >
> > …..
> >
> > …..
> >
> >
> >
> > I wanted to divide and count each of the above subsets based on a set
> > of parameters common to all subsets. I did the following to go through
> > each subset and it works:
> >
> > For (I in 1: length (AAA)) {
> >
> > aa <- c(AAA[color==”green”&grade==”a”,month==”Januray”
> > .N],[ AAA[color==”green”&grade==”b”& month==”June”’ .N])
> >
> > }
> >
> >
> >
> > The question: I don’t want to have a separate loop for each subset (10
> > loops). Instead, I was hoping to have 2 nested loops in the form below:
> >
> >
> >
> > For (I in 1:N)){
> >
> > For (j in 1:M){
> >
> >
> >
> > }
> >
> > }
> >
> >
> >
> > Sample
> >
> >
> > Num
> >
> > Color
> >
> > Grade
> >
> > Value
> >
> > Month
> >
> > Day
> >
> > 1
> >
> > yellow
> >
> > A
> >
> > 20
> >
> > May
> >
> > 1
> >
> > 2
> >
> > green
> >
> > B
> >
> > 25
> >
> > June
> >
> > 2
> >
> > 3
> >
> > green
> >
> > A
> >
> > 10
> >
> > April
> >
> > 3
> >
> > 4
> >
> > black
> >
> > A
> >
> > 17
> >
> > August
> >
> > 3
> >
> > 5
> >
> > red
> >
> > C
> >
> > 5
> >
> > December
> >
> > 5
> >
> > 6
> >
> > orange
> >
> > D
> >
> > 0
> >
> > January
> >
> > 13
> >
> > 7
> >
> > orange
> >
> > E
> >
> > 12
> >
> > January
> >
> > 5
> >
> > 8
> >
> > orange
> >
> > F
> >
> > 11
> >
> > February
> >
> > 8
> >
> > 9
> >
> > orange
> >
> > F
> >
> > 99
> >
> > July
> >
> > 23
> >
> > 10
> >
> > orange
> >
> > F
> >
> > 70
> >
> > May
> >
> > 7
> >
> > 11
> >
> > black
> >
> > A
> >
> > 77
> >
> > June
> >
> > 11
> >
> > 12
> >
> > green
> >
> > B
> >
> > 87
> >
> > April
> >
> > 33
> >
> > 13
> >
> > black
> >
> > A
> >
> > 79
> >
> > August
> >
> > 9
> >
> > 14
> >
> > green
> >
> > A
> >
> > 68
> >
> > December
> >
> > 14
> >
> > 15
> >
> > black
> >
> > C
> >
> > 90
> >
> > January
> >
> > 31
> >
> > 16
> >
> > green
> >
> > D
> >
> > 79
> >
> > January
> >
> > 11
> >
> > 17
> >
> > black
> >
> > E
> >
> > 101
> >
> > February
> >
> > 17
> >
> > 18
> >
> > red
> >
> > F
> >
> > 90
> >
> > July
> >
> > 21
> >
> > 19
> >
> > red
> >
> > F
> >
> > 112
> >
> > February
> >
> > 13
> >
> > 20
> >
> > red
> >
> > F
> >
> > 101
> >
> > July
> >
> > 20
> >
> >
> >
>
> [[alternative HTML version deleted]]
>
> ______________________________________________
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> PLEASE do read the posting guide http://www.R-project.org/posting-
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