CODEWITHSUNDEEP
rdataframe
Liondancer
Liondancer

Reputation: 16469

Randomly selecting dataframe column. Avoid sampling same column again

Is there a way to random pick a column in a dataframe and then avoid randomly pick it again? This should pick a random column 

random_data_vector = data[, sample(ncol(data), 1)]

but I'm not sure how to avoid picking the column again. I thought about removing the column completely but there might be a better approach

Upvotes: 0

Views: 24

Answers (1)

kath
kath

Reputation: 7724

You can first sample the columns with 

random_cols <- sample(ncol(data))

and then select the random vectors like this 

random_data_vector1 <- my_df[, random_cols[1]]
random_data_vector2 <- my_df[, random_cols[2]]

The default setting of sample is replace = FALSE, thus in the random_cols vector you won't have duplicated numbers and you won't select one column twice.

Upvotes: 2

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