r Archives - Page 14 of 18

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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Write lines of text to a file in R

In the R scripting language, how do I write lines of text, e.g., the following two lines Hello World to a file named ...

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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How to change legend title in ggplot

I have the following plot like below. It was created with this command: library(ggplot2) df <- data.frame(cond = factor(rep(c("A", "B"), each = 200)), ...

May 6, 2022
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Why is `[` better than `subset`?

When I need to filter a data.frame, i.e., extract rows that meet certain conditions, I prefer to use the subset function: subset(airquality, Month ...

May 6, 2022
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Extracting specific columns from a data frame

I have an R data frame with 6 columns, and I want to create a new dataframe that only has three of the ...

May 6, 2022
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How to add leading zeros?

I have a set of data which looks something like this: anim <- c(25499,25500,25501,25502,25503,25504) sex <- c(1,2,2,1,2,1) wt <- c(0.8,1.2,1.0,2.0,1.8,1.4) data <- data.frame(anim,sex,wt) ...

May 6, 2022
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