by Suf | Sep 1, 2022 | Programming, R, Tips
Using the rowwise function from dplyr in combination with the mutation function, you can apply a function to every row in a table. For example, data %>% rowwise() %>% # a, b, c are column names mutate(sum_val = sum(a, b, c)) This tutorial will go through how to use...
by Suf | Aug 29, 2022 | Programming, R, Tips
The easiest way to add a sequence of numbers as an index column is to use the nrow() function, for example, df$index <- 1:nrow(df) This tutorial will explain how to add a numeric ID column to a data frame with code examples. Table of contentsAdd Index Column to...
by Suf | Aug 26, 2022 | C++, Programming, Tips
This tutorial will go through how to iterate over the words of a string consisting of multiple words. Table of contentsIterate Over Words using istringstreamIterate Over Words using for-loopIterate Over Words using strtokIterate Over Words using Boost LibrarySummary...
by Suf | Aug 23, 2022 | C++, Programming, Tips
The simplest way to iterate through a vector using a for loop and the [] operator to index the vector. This tutorial will describe how to iterate through a vector with code examples. Table of contentsIterate Through a Vector Using IndexingIterate Through a Vector...
by Suf | Aug 22, 2022 | Programming, R, Tips
The error “plot. new has not been called yet” occurs when you try to do something that requires a plot to exist but have not yet created a plot. You can solve this by creating a plot first before trying to perform the required action. For example, #...
