Check if the object(variable) is defined in R

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I want to check if some variable is already defined in R without getting an error. How to dot this?

Below is my trial, but I could not succeed in it.

> is.na(qqaaa)
Error: object 'qqaaa' not found
> is.finite(qqaaa)
Error: object 'qqaaa' not found

Thanks!

Apr 17, 2018 in Data Analytics by CodingByHeart77
• 3,680 points
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1 answer to this question.

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0 votes

You can use the exists():

> exists("toFindUnknown")
[1] FALSE
> toFindUnknown <- 32
> exists("toFindUnknown")
[1] TRUE
answered Apr 17, 2018 by darklord
• 6,140 points

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