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:

[hidden email]] On Behalf Of Ek Esawi

> Sent: Wednesday, May 3, 2017 5:17 PM

> To:

[hidden email]
> 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 <

[hidden email]> 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]]

>

> ______________________________________________

>

[hidden email] mailing list -- To UNSUBSCRIBE and more, see

>

https://stat.ethz.ch/mailman/listinfo/r-help> PLEASE do read the posting guide

http://www.R-project.org/posting-> guide.html

> and provide commented, minimal, self-contained, reproducible code.

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