r Archives - Page 13 of 17

Is there an R function for finding the index of an element in a vector?

In R, I have an element x and a vector v. I want to find the first index of an element in v ...

May 9, 2022
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Convert data.frame columns from factors to characters

I have a data frame. Let’s call him bob: > head(bob) phenotype exclusion GSM399350 3- 4- 8- 25- 44+ 11b- 11c- 19- NK1.1- ...

May 9, 2022
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How can I trim leading and trailing white space?

I am having some trouble with leading and trailing white space in a data.frame. For example, I look at a specific row in ...

May 9, 2022
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How to find the length of a string in R

How to find the length of a string (i.e., number of characters in a string) without splitting it in R? I know how ...

May 9, 2022
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Representing Parametric Survival Model in ‘Counting Process’ form in JAGS

I’m trying to build a survival model in JAGS that allows for time-varying covariates. I’d like it to be a parametric model — ...

May 8, 2022
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How to set limits for axes in ggplot2 R plots?

I plot the following: library(ggplot2) carrots <- data.frame(length = rnorm(500000, 10000, 10000)) cukes <- data.frame(length = rnorm(50000, 10000, 20000)) carrots$veg <- 'carrot' cukes$veg ...

May 8, 2022
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Sample random rows in dataframe

I am struggling to find the appropriate function that would return a specified number of rows picked up randomly without replacement from a ...

May 8, 2022
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Side-by-side plots with ggplot2

I would like to place two plots side by side using the ggplot2 package, i.e. do the equivalent of par(mfrow=c(1,2)). For example, I ...

May 7, 2022
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How to rename a single column in a data.frame?

I know if I have a data frame with more than 1 column, then I can use colnames(x) <- c("col1","col2") to rename the ...

May 7, 2022
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Elegant way to check for missing packages and install them?

I seem to be sharing a lot of code with coauthors these days. Many of them are novice/intermediate R users and don’t realize ...

May 7, 2022
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