match() returns the index of the first element in a vector that matches a. P.S: Ultimate goal is the apply to a column of a dataframe and use for creating a variable containing this conditions and if condition not met than just place NA, so will be at the end a column for "X" as "X_1" and "Y" as "Y_1" what will have data as follow: if value of each cell of column is non-zero than extract first non-zero element and if is "NA" or "0" than value will be "NA". The indices of a logical vector that are TRUE are returned by the function which().
indx specifies the complete vector at the corresponding index value of the complete list.
Thinking of regex for extracting but i'm unfamiliar with so advanced technique in R, I can extract number or part of string but not as a search, any help will be great. Here, in the above code, vec1 is an integer vector of length 3. and outputing a list and if is NA just keep NA for that cell. Only thing left is for each list in the list created to extract the first non-zero value. The vector is the list of values the diff() function is being operated on. For any given vector it returns a vector with the rank of the first entry. The R diff function has the format of diff(vector, lag, differences). R list is the object which contains elements of different types like strings, numbers, vectors and another list inside it. remove the first element or last element of a vector in o (1) remove an element of a vetor without knowing its index cpp. remove a specific elemtn by index vector cpp. Now a list of list creation from a column: cl <- data$X mybiglist <- list()į.split <- as.numeric(strsplit(as.character(cl), "")]) Before we get started with the motivating dataset, we need to cover the very. delete a value from an index in a vector in cpp. Question: how do I extract first no-zero element? So the result of b I try to check and extract first non-zero element so will result in: 7 So first I did split the elements: l <- split(test, 1)Īnd after just split elements in characters: a <-0.0799ī <- as.numeric(strsplit(as.character(a), "")])
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