[R] R Programming help needed - Returning dataframes + 2 Variables dynamically
Koustav Pal
koustavpal.devel at gmail.com
Fri Jul 28 08:55:54 CEST 2017
c() is used for constructing vectors. Or in other words using the method
c(x,y) provides a vector of length 2 (hopefully). Therefore, you are
pushing a single vector to your function and not two arguments as you want.
It should be Logic_fn(x,y) not Logic_fn(c(x,y)).
Furthermore, i would recommend reading up on how function constructs work.
Two return statements within a function are redundant because the function
will exit after the first return statement, and anything else just creates
more ambiguity. If you want to return the x y variables as well, you should
use a list like so, list(test_data, x, y) and then retrieve information
from the list like this Boo[[1]].....
Finally i would also like to point out that you should note R's behaviour
unless explicitly stated while calling the function is to assign the first
argument to the first declared variable and the second to the second. So,
if you called Logic_fn(y,x), then y will be assigned to x and x to y. So to
avoid such a scenario you can mention it explicitly as Logic_fn(y=y,x=x).
On Jul 28, 2017 8:39 AM, "Vijaya Kumar Regati" <VijayaKumar.Regati at m3bi.com>
wrote:
Hi,
Can someone please help me on below issue I am facing :
I am trying to play with returning a dataframe+2 variables using a fn.
But facing an issue :
Error in Logic_fn(c(x, y)) : argument "y" is missing, with no default
This is the code I am using :
x <- 0
y <- 0
Logic_fn <- function(x,y){
x <- x + 1
y < y + 1
test_data <- rbind(x,y)
test_data <- data.frame(test_data)
return(test_data)
return(c(x,y))
}
for ( i in 1:1) {
test_data <- Logic_fn(c(x,y))
test_data[1]
test_data[2]
test_data
}
With Regards,
Vijaya Kumar Regati
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