exists

exists(x)
Check if an R object exists in the current session. Functions and data objects from the base or other packages may also be checked.
  • x – The name of an R object as a character string.

Example. I grab a few variables from yesterday’s post, then I look for a few variables, one of which doesn’t exists, and then several functions.
> 
> #______ Code From Yesterday ______#
> x1 <- c(52938, 1928, 12, 2, 0.0053)
> x2 <- c(52938, 1928, 12, 2, 0.005)
> y  <- c(52938, 1928, 12, 2, 0)
> 
> exists("x1")
[1] TRUE
> exists("x2")
[1] TRUE
> exists("x3")
[1] FALSE
> 
> #______ Look For Functions ______#
> exists("all")
[1] TRUE
> exists("getReturns")
[1] FALSE
> 
> library(stockPortfolio)
> exists("getReturns")
[1] TRUE
> 
The all function has its own post. I’ll cover the getReturns function in a future post.

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