Using ifelse in R

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If you want to use ifelse and nest things you could do something like this

test <- data.frame(x = 2, y = 5, z = 3)
with(test, ifelse(z > 0 & x > 0 | y > 3, "yes", "no"))

In this case you’re using logical operators to guard the output. You’ll still get “no” if z <= 0, but you can deal with that pretty easily.

with(test, ifelse(z > 0, ifelse(x > 0 | y > 3, "yes", "no"), NA))

Nested ifelse statements can get hard to follow in any language, so consider matching or switch statements if you end up with more than 3 of them.

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