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Editorial Team
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Asked: 2026-06-08T18:16:07+00:00

I would like to create a data frame like this: Label Jim Charles Kevin

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I would like to create a data frame like this:

Label   Jim Charles Kevin Alan
Charles 0   1       0     0  
Kevin   0   0       1     0
Alan    0   0       0     1
Alan    0   0       0     1
Jim     1   0       0     0

I am starting with a data frame where the column names are set and the people’s names are listed in the first column, but all the numbers are 0. I want to quickly be able to set some of them to 1 by matching the name listed in the first column to the column name.

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1 Answer

  1. Editorial Team

    Similar to Ben’s answer, if you’re data is in a data.frame called df:

    df <- structure(list(Label = c("Charles", "Kevin", "Alan", "Alan", 
"Jim"), Jim = c(0, 0, 0, 0, 0), Charles = c(0, 0, 0, 0, 0), Kevin = c(0, 
0, 0, 0, 0), Alan = c(0, 0, 0, 0, 0)), .Names = c("Label", "Jim", 
"Charles", "Kevin", "Alan"), row.names = c(NA, -5L), class = "data.frame")

df[outer(df$Label, names(df), '==')] <- 1
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