Check if entry is not numeric
Examples
not.numeric("45") # TRUE
#> [1] TRUE
not.numeric(45) # FALSE
#> [1] FALSE
if(not.numeric(45)) message("yes") # yes
Check if entry is not numeric
not.numeric("45") # TRUE
#> [1] TRUE
not.numeric(45) # FALSE
#> [1] FALSE
if(not.numeric(45)) message("yes") # yes