I'm hoping this is an easy fix. Whenever I run levels(df) am I given a NULL output. This isn't specific to my data frame as it occurs with any set of data that I use. I am thinking that there may b...

Maybe this is simple but I can't find answer on web. I have problem with mean calculation by factors by level. My data looks typicaly: factor, value a,1 a,2 b,1 b,1 b,1 c,1 I want to get vector ...

A have a real problem (and a headache) with an assignment... I'm in an introductory programming class, and I have to write a function that, given a list, will return the "maximum" depth it goes to...

Given the following mock data: set.seed(123) x <- data.frame(let = sample(letters[1:5], 100, replace = T), num = sample(1:10, 100, replace = T)) y <- subset(x, let != 'a') Creating a tab...

I have data frame with some numerical variables and some categorical factor variables. The order of levels for those factors is not the way I want them to be. numbers <- 1:4 letters <- fact...

I think this has been up before, but could'nt find any answer to it. If it's already answered please point me in the right direction with a link. I have an array that I wan't to remove the f...

I want to generate the column: "PriorityCountInLast7Days". For a given employee A, this column counts the number of CASES in the last 7 days where PRIORITY is the same as the current case. How woul...

I understand this is a very basic question but I don't understand what levels mean in R. For reference, I have done a simple script to read CSV table, filter on one of the fields, pass this on to ...

training set trainSample <- cbind(data[1:980,1], data[1:980,2]) cl <- factor(c(data[1:980,3])) test set testSample <- data(data[981:1485,1], data[981:1485,2]) cl.test <- clknn pre...

I want to plot unused levels (that is, levels where the count is 0) in my bar-plot, however, unused levels are dropped and I cannot figure out how to keep them df <- data.frame(type=c("A", "A",...

I am new to R Programming. I wrote a sample program and that returns a value of a particular column in a matrix. When I print the value i get something like this [1] APPLE 2 Levels : 1 2 How do...

This is my data: type<-rep(c(0,1),100) diff<-rnorm(100) data<-data.frame(type,diff) If I want to plot historgram of diff, I do this: hist(data$diff) But what I want to do to split m...

I have a data frame that has several variables that have 5 factor levels. I want to delete only one of those levels. First I assigned all instances of of that level to NA, and then used the droplev...

I have a data.frame as shown below: task measure right m1 left m2 up m3 down m4 front m5 back m6 . . . The task column takes only six different values, which are treated as factors, and ar...

I was doing some experimentation with integrity levels and icacls on Windows 7. I set mandatory integrity levels, so that I get something that looks like this: C:\Debug>icacls test.exe test.exe...

I have a png image with a white background which I'd like to turn transparent. This is fairly simple with this command: $ convert image.png -transparent white image-trans.png However, if the whi...

In an answer to another question, @Marek posted the following solution: https://stackoverflow.com/a/10432263/636656 dat <- structure(list(product = c(11L, 11L, 9L, 9L, 6L, 1L, 11L, 5L, 7L, 11L...

An example of a non-settable function would be labels. You can only set factor labels when they are created with the factor() function. There is no labels<- function. Not that 'labels' and 'leve...

I'm using Unity 3 to build my game. I have a basic GUI button that when clicked, I would like the user to be taken to a random level. There are 10 levels in my game. Below is a copy of the code I'm...

I imported data from a .csv file, and attached the dataset. My problem: one variable is in integer form and has 295 levels. I need to use this variable to create others, but I don't know how to dea...

Each time when I have to recode some set of variables, I have SPSS recode function in mind. I must admit that it's quite straightforward. There's a similar recode function in car package, and it do...