r-faq Archives - Page 3 of 7

Split data frame string column into multiple columns

I’d like to take data of the form before = data.frame(attr = c(1,30,4,6), type=c('foo_and_bar','foo_and_bar_2')) attr type 1 1 foo_and_bar 2 30 foo_and_bar_2 3 ...

May 16, 2022
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Concatenate a vector of strings/character

If I have a vector of type character, how can I concatenate the values into string? Here’s how I would do it with ...

May 15, 2022
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Formatting Decimal places in R

I have a number, for example 1.128347132904321674821 that I would like to show as only two decimal places when output to screen (or ...

May 14, 2022
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How to save a plot as image on the disk?

I plot a simple linear regression using R. I would like to save that image as PNG or JPEG, is it possible to ...

May 14, 2022
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Evaluate expression given as a string

I’m curious to know if R can use its eval() function to perform calculations provided by e.g. a string. This is a common ...

May 14, 2022
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How to reshape data from long to wide format

I’m having trouble rearranging the following data frame: set.seed(45) dat1 <- data.frame( name = rep(c("firstName", "secondName"), each=4), numbers = rep(1:4, 2), value = ...

May 13, 2022
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Plotting two variables as lines using ggplot2 on the same graph

A very newbish question, but say I have data like this: test_data <- data.frame( var0 = 100 + c(0, cumsum(runif(49, -20, 20))), var1 ...

May 12, 2022
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Order Bars in ggplot2 bar graph

I am trying to make a bar graph where the largest bar would be nearest to the y axis and the shortest bar ...

May 12, 2022
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