To handle non-conforming values, you can use the grepl() function to check for non-numeric characters before applying the as.numeric() function. For example, here’s how to convert a vector of numeric strings to a numeric vector while handling non-conforming values: my_vec[!grepl("[^0-9...
Use the substr() Function to Remove the Last Characters in R. Use the str_sub() Function to Remove the Last Characters in R. Use the gsub() Function to Remove the Last Characters in R. What is Grepl R? The grepl R functionsearches for matches of certain character pattern in a vector...
How to extract unique combination of rows in an R data frame - To extract the unique combination of rows, we can subset the data frame with single square brackets and use the negation of the duplicated function after sorting the rows in the data frame. T
Let’s assume that we want to create a new data frame variable based on the values of the variable x1. Then, we might try to use thewhich functionas shown in the following R code: data$x1_range[which(data$x1<=2)]<-"<= 2"# Try to create new variable# Error in `$<-.data.fr...
How to subset rows of an R data frame if any columns have values greater than a certain value - To subset rows of an R data frame if any columns have values greater than a certain value, we can follow the below steps −First of all, create a data frame
In the code below we use the rOpenSci package bib2df by Philipp Ottolinger to parse the .bib file of all R Journal issues and find these articles. journal <- bib2df::bib2df("https://journal.r-project.org/archive/RJournal.bib") knitr::kable( journal[grepl("CRAN", journal$TITLE),...
This is awesome. I will try to use it to update labels too. This is how I did it: Javascript: window.LeafletWidget.methods.setLabel = function(category, layerId, label){ var map = this; if (!layerId){ return; } else if (!(typeof(layerId) === "object" && layerId.length)){...
plot( subset( sudanwater.shp , grepl( "NILE|LAKE" , NAME ) ) ) # # # map of egyptian states # # # # use uc davis's administrative regions admin.fn <- "http://biogeo.ucdavis.edu/data/diva/adm/EGY_adm.zip" # store it to the local disk download_cached( admin.fn , tf...
also .xls files. We can remove them using the grepl() function, which performs partial matches on strings, returning TRUE if the pattern required is found, or FALSE if not. We are going to set the following test here: give me TRUE if you find .pdf in the filename, and FALSE if ...
Find the (row,column) locations of all matches to a substring in large dataset Solution 1: reprex::reprex_info() #> Created by the reprex package v0.1.1.9000 on 2018-02-10 Utilizinggreplwith some manipulation can yield row and column indices instead of the vector index obtained fromgrep...