apply
Concatenate row-wise across specific columns of dataframe
I have a data frame with columns that, when concatenated (row-wise) as a string, would allow me to partition the data frame into a desired form.[详细]
2023-03-12 05:53 分类:问答Companion object in Scala isn't associating itself with case class
I\'m having some trouble understanding why this code won\'t work. I got it from 99 Scala Problems in the Binary Trees section (http://aperiodic.net/phil/scala/s-99/). It looks valid to me: the Node ob[详细]
2023-03-11 05:21 分类:问答Fisher test using apply function in R
The following is the code: the problem is that the calculation is very slow. The matrices, gene1, gene2 and neither are of same length (8000)[详细]
2023-03-10 16:02 分类:问答Use mapply to fit list of lm models to list of data frames [R]
Is this possible? I can get mapply to work with the help examples, but I can\'t get a trivial example with lm to work. Here\'s my attempt which returns a matrix, instead of a list of lm objects.[详细]
2023-03-09 22:31 分类:问答Javascript context issue using Object.create() and function.apply doesn't seem to work?
I am running into the error with object context when trying to use Object.create.This is a very simple example, but this is what I am doing:[详细]
2023-03-09 20:28 分类:问答How to efficiently sum over levels defined in another variable?
I am new to R. Now I have a function as follow: funItemAverRating = function() { itemRatingNum = array(0, itemNum);[详细]
2023-03-06 05:46 分类:问答CSS for mail doesn't apply?
I have no idea what\'s going 开发者_如何学JAVAon now. I threw together a simple page with very simple CSS. I used tables cause i know you can\'t use div elements like normal for emails. So after viewi[详细]
2023-03-01 12:39 分类:问答Cannot dynamically modify external variables in a subroutine in R while use apply on a matix?
This problem has already confused me for a couple of days. Let us say that I have two matrices: matrix_a <- matrix(0, nrow = 3, ncol = 3,[详细]
2023-02-23 12:14 分类:问答apply() and calculating proportion of first row for all dataframe rows
I have a dataframe as shown below listing the number of injuries by vehicle type: trqldnum <- data.frame(motorveh=c(796,912,908,880,941,966,989,984),[详细]
2023-02-22 03:05 分类:问答from for loop to apply
I am new in using R. So I am not sure about how to use apply. I would like to speed up my function with using apply:[详细]
2023-02-20 11:58 分类:问答