gsub

[Solved] How to convert string rule to an expression which has a range in R [closed]

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I’d do it in several steps: Split on logical operators into separate inequalities. Change double inequalities like -3>x1>=-1.45 into two inequalities. Change “=” to “==”, and put it all together. For example: a1 <- strsplit(a, “&”, fixed = TRUE)[[1]] a1a <- gsub(” “, “”, a1) # get rid of spaces a2 <- gsub(“([-0-9.]+[<>=]+)([[:alpha:]]+[[:alnum:]]*)([<>=]+.+)”, “\\1\\2 & … Read more

[Solved] Match a character in string and add characters before and after matched string using R [closed]

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I modified the code to include the strings in single quotes. (R requires single or double quotes for strings. I used single quotes so as not to have to escape the double quotes.) Before <- ‘kzyFw4hw8EOC/655’ After <- ‘kzyFw4hw8EOC”https://stackoverflow.com/”655’ Using base R: gsub.method <- gsub(“https://stackoverflow.com/”, ‘”https://stackoverflow.com/”‘, Before) gsub.method == After # [1] TRUE or using … Read more

[Solved] Replacing row elements in a dataframe based on values from another dataframe [duplicate]

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Here’s a stab: tableresults <- read.table(header=TRUE, stringsAsFactors=FALSE, text=” ACTIVITY_X ACTIVITY_Y ACTIVITY_Z winning_cluster 1 19 21 28 cluster3 2 20 14 24 cluster3 3 34 35 49 cluster3 4 18 5 19 cluster2 5 23 27 35 cluster3 6 33 20 39 cluster3″) averagetable <- read.table(header=TRUE, stringsAsFactors=FALSE, text=” Group.1 Standing 1 cluster1 0.5642857 2 cluster2 0.7795848 … Read more

[Solved] How to select certain character? [closed]

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Please add a reproducible sample next time. Below is the sample input based on the data from the given link. Input: url <- c(“/history/apollo/”, “/shuttle/countdown/”, “/shuttle/missions/sts-73/mission-sts-73.html”, “/shuttle/countdown/liftoff.html”, “/shuttle/missions/sts-73/sts-73-patch-small.gif”, “/images/NASA-logosmall.gif”, “/shuttle/countdown/video/livevideo.gif”, “/shuttle/countdown/countdown.html”, “/shuttle/countdown/”, “https://stackoverflow.com/”, “/shuttle/countdown/count.gif”, “/images/NASA-logosmall.gif”, “/images/KSC-logosmall.gif”, “/shuttle/countdown/count.gif”, “/images/NASA-logosmall.gif”, “/images/KSC-logosmall.gif”, “/images/ksclogo-medium.gif”, “/images/launch-logo.gif”, “/facts/about_ksc.html”, “/shuttle/missions/sts-71/images/KSC-95EC-0916.jpg”) return_code <- c(200, 200, 200, 304, 200, 304, 200, 200, 200, 200, … Read more

[Solved] Using sub to reduce length of text [closed]

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sub(“.*;\\s*”, “”, String) Explanation: .* – matches any number of characters at the beginning ; – matches the last ; \s* – matches zero or more white-space characters after the ; So the first expression matches everything up to the first non-blank character after the last ;. It is replaced with the empty string, so … Read more