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Answer by Sebastian Tacora for How to check if object (variable) is defined...
If you don't mind using quotes, you can use:exists("x")If you don't want to use quotes you can use:exists(deparse(substitute(x)))
View ArticleAnswer by smoe for How to check if object (variable) is defined in R?
There may be situations in which you do not exactly know the name of the variable you are looking for, like when an array of results have been created by a queuing system. These can possibly be...
View ArticleAnswer by Nirmal for How to check if object (variable) is defined in R?
If you don't want to use quotes, you can use deparse(substitute()) trick which I found in the example section of ?substitute:is.defined <- function(sym) { sym <- deparse(substitute(sym)) env...
View ArticleAnswer by sbaldrich for How to check if object (variable) is defined in R?
As others have pointed out, you're looking for exists. Keep in mind that using exists with names used by R's base packages would return true regardless of whether you defined the variable:>...
View ArticleAnswer by tim for How to check if object (variable) is defined in R?
if you are inside a function, missing() is what you want.exchequer = function(x) { if(missing(x)){ message("x is missing… :-(") }}exchequer()x is missing… :-(
View ArticleAnswer by Dirk is no longer here for How to check if object (variable) is...
You want exists():R> exists("somethingUnknown")[1] FALSER> somethingUnknown <- 42R> exists("somethingUnknown")[1] TRUER>
View ArticleAnswer by Gavin Simpson for How to check if object (variable) is defined in R?
See ?exists, for some definition of "...is defined". E.g.> exists("foo")[1] FALSE> foo <- 1:10> exists("foo")[1] TRUE
View ArticleHow to check if object (variable) is defined in R?
I'd like to check if some variable is defined in R - without getting an error. How can I do this?My attempts (not successful):> is.na(ooxx)Error: object 'ooxx' not found> is.finite(ooxx)Error:...
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