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Re: How to create loop of different sequence for each record

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Tue, 22 May 2018 10:46:47 -0400

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 ```Hi Pornpamol, A couple of things I noticed here: (1) In R, a matrix and a data.frame are always rectangular, so both the number of rows is fixed, as well as the number of columns. If you want a more generic structure to store sequences of different lengths, you might be looking for a list: ``` E_table <- list(300:305, 290:305) E_table[[1]] # is the sequence 300:305 E_table[[2]] # is the sequence 290:305 # note the use of double square brackets to extract out the contents of the list ``` (2) It looks like `sam_10tdw` is a data.frame or matrix, so `sam_10tdw\$dimEW` will return a vector of values. If you want to access this for each individual row, using the index variable `i`, then you probably want `sam_10tdw\$dimEW[i]`. Best, -- Hao Ye [log in to unmask] On Tue, May 22, 2018 at 9:46 AM, Pattamanont,Pornpamol <[log in to unmask] > wrote: > Hello guys, > > > I'm trying to create a sequence of number for each cow. The starting > numbers are different by each. The final number is the same which is 305. > My questions are: > > > Question1. How can I create a sequence of number for each cows by loop? > > > E_table <- matrix(NA,nrow = nrow(sam_10tdw), ncol = 268, byrow = T) > for(i in 1:nrow(sam_10tdw)) { > nE <- sam_10tdw[i,c(sam_10tdw\$dimEW:305)] > E_table[i,] <- nE > } > > E_table <- matrix(NA,nrow = nrow(sam_10tdw), ncol = 268, byrow = T) > for(i in 1:nrow(sam_10tdw)) { > nE <- seq(sam_10tdw\$dimEW, 305, by = 1) > E_table[i,] <- nE > } > > These 2 codes didn't work. (using only "nE <- c(sam_10tdw\$dimEW:305)" is > work for 1 cow) > > Question2. How can I create matrix to store these sequences which > have different columns for each cow. The shortest column length is 145 > columns; the longest is 268 columns. I try to assign the longest columns, > but not sure if it works as I stuck with an error from question 1. > > Thanks for your help (Hopefully I wrote it clear enough), > Pornpamol > > This list strives to be beginner friendly. However, we still ask that you > PLEASE do read the posting guide https://urldefense.proofpoint.com/v2/url?u=http-3A__www.R-2Dproject.org_&d=DwIBaQ&c=pZJPUDQ3SB9JplYbifm4nt2lEVG5pWx2KikqINpWlZM&r=QWxQId63qB2iSP1ggUL7kQsdfEWUTu6qCGEw8Xuo91A&m=cjc_yWmvWTsVBqb2dmBg-1IzJGbHGpksdKi5dpx5xdY&s=wfmHG_V2lecw65_DVoCNds6capgQYLdHj5fbPhTA9yY&e= > posting-guide.html > and provide commented, minimal, self-contained, reproducible code. > This list strives to be beginner friendly. However, we still ask that you 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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