Hi Michael it is simple
set.seed(111) let=sample(letters[1:10],6, replace=T) dat1<-data.frame(let=let, customer=sample(1:10,6, replace=T)) let=sample(letters[1:10],6, replace=T) dat2<-data.frame(let=let, customer=sample(1:10,6, replace=T)) merge(dat1, dat2, by.x="let", by.y="let", all=T) Of course you could add customer variable to by parameter but sometimes it is necessary to leave it out. When you have two sets of analytical results and you have 2 variables operator but you want to merge those sets e.g. by date/hour of analysis. Regards Petr > -----Original Message----- > From: R-help [mailto:r-help-boun...@r-project.org] On Behalf Of Michael > Dewey > Sent: Monday, June 6, 2016 3:46 PM > To: g.maub...@weinwolf.de; r-help@r-project.org > Subject: Re: [R] Merging variables > > X-Originating-<%= hostname %>-IP: [217.155.205.190] > > Dear Georg > > I find it a bit surprising that you end up with customer.x and customer.y. Can > you share with us a toy example of two data.frames which exhibit this > behaviour? > > On 06/06/2016 13:29, g.maub...@weinwolf.de wrote: > > Hi All, > > > > I merged two datasets: > > > > ds_merge1 <- merge(x = ds_bw_customer_4_match, y = > > ds_zww_customer_4_match, > > by.x = "customer", by.y = "customer", > > all.x = TRUE, all.y = FALSE) > > > > R created a new dataset with the variables customer.x and customer.y. > > I would like to merge these two variable back together. I wrote a > > little function (code can be run) for it: > > > > -- cut -- > > > > customer.x <- c("Miller", "Smith", NA, "Bird", NA) > > customer.y <- c("Miller", NA, "Doe", "Fish", NA) > > ds_test <- data.frame(customer.x, customer.y, stringsAsFactors = > > FALSE) > > > > t_merge_variables <- > > function(dataset, > > var1, > > var2, > > merged_var) { > > > > # Initialize > > dataset[[merged_var]] = rep(NA, nrow(dataset)) > > dataset[["mismatch"]] = rep(NA, nrow(dataset)) > > > > for (i in 1:nrow(dataset)) { > > > > # Check 1: var1 missing, var2 missing > > if (is.na(dataset[[i, var1]]) & > > is.na(dataset[[i, var2]])) { > > dataset[["mismatch"]] <- 1 # var1 & var2 are missing > > > > # Check 2: var1 filled, var2 missing > > } else if (!is.na(dataset[[i, var1]]) & > > is.na(dataset[[i, var2]])) { > > dataset[[i, merged_var]] <- dataset[[i, var1]] > > dataset[["mismatch"]] <- 0 > > > > # Check 3: var1 missing, var2 filled > > } else if (is.na(dataset[[i, var1]]) & > > !is.na(dataset[i, var2])) { > > dataset[[i, merged_var]] <- dataset[[i, var2]] > > dataset[["mismatch"]] <- 0 > > > > # Check 4: var1 == var2 > > } else if (dataset[[i, var1]] == dataset[[i, var2]]) { > > dataset[[i, merged_var]] <- dataset[[i, var1]] > > dataset[["mismatch"]] <- 0 > > > > # Leftover: var1 != var2 > > } else { > > dataset[[i, merged_var]] <- NA > > dataset[["mismatch"]] <- 2 # var1 != var2 > > } # end if > > } # end for > > return(dataset) > > } > > > > ds_var_merge1 <- t_merge_variables(dataset = ds_test, > > var1 = "customer.x", > > var2 = "customer.y", > > merged_var = "customer") > > > > ds_var_merge1 > > > > -- cut -- > > > > It is executed without error but delivers the wrong values in the > > variable "mismatch". This variable is always 1 although it should be > > NA, 1 or 2 respectively. > > > > Can you tell me why the variable is not correctly set? > > > > Kind regards > > > > Georg > > > > ______________________________________________ > > R-help@r-project.org 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. > > > > -- > Michael > http://www.dewey.myzen.co.uk/home.html > > ______________________________________________ > R-help@r-project.org 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. ________________________________ Tento e-mail a jakékoliv k němu připojené dokumenty jsou důvěrné a jsou určeny pouze jeho adresátům. 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