CODEWITHSUNDEEP
rinverse
jme_123
jme_123

Reputation: 3

Calculation the negative inverse of values <1 in a dataframe in R

I am a beginner using R so apologies if this is a stupid question. I have a data frame that has a column containing 7000 values. I want to calculate the negative inverse (-1/value) for all values <1 in that column while leaving all values >= 1 unchanged.

What is the easiest way of doing this?

Upvotes: 0

Views: 262

Answers (3)

LMc
LMc

Reputation: 18662

You could also also subset and replace your vector where your condition is TRUE:

v[v < 1] <- -1 / v[v < 1]

Upvotes: 0

ThomasIsCoding
ThomasIsCoding

Reputation: 102241

Perhaps you can try replace like below

replace(v, v<1,-1/v[v<1])

or a more mathy way

(1 - 2 * (v < 1)) * v^(1 - 2 * (v < 1))

Upvotes: 1

Oliver
Oliver

Reputation: 8582

say your data is called df and has a column called values you could do:

ifelse(df$values < 1, 
       -1 / df$values, #negative inverse of all <1 
       df$values) #keep others the same

Upvotes: 1

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