The returned values are in the list you assign to test_data, the original x and
y are not modified, i.e the returned value for x will be test_data[[1]] and for
y will be test_data[[2]]. Using the same variable names in the function and
test is perhaps what is leading to confusion.
> On 28 Jul 2017, at 09:13, Vijaya Kumar Regati <vijayakumar.reg...@m3bi.com>
> wrote:
>
> Hi,
>
>
> That was very useful information. Thanks.
>
> But still I am not able to get the desired output with updated code.
>
> Kindly help if you have any further thoughts ...
>
> Updated code :
> x <- 0
> y <- 0
>
> Logic_fn <- function(x,y){
>
> print("Passed Values")
> print(x)
> print(y)
> x <- x + 1
> y <- y + 1
>
> print("After addition :")
> print(x)
> print(y)
>
> test_data <- rbind(x,y)
> test_data <- data.frame(test_data)
> return(list(x,y,test_data))
> }
>
> for ( i in 1:1 ) {
> test_data <- Logic_fn(x,y)
> print("Returned Values :")
> print(x)
> print(y)
> }
>
>
> Wrong output :
> [1] "Passed Values"
> [1] 0
> [1] 0
> [1] "After addition :"
> [1] 1
> [1] 1
> [1] "Returned Values :"
> [1] 0
> [1] 0
>
>
> With Regards,
> Vijaya Kumar Regati
> Technical Lead, M3bi India Private Ltd
> Work: 040-67064732
>
> ________________________________
> From: Koustav Pal <koustavpal.de...@gmail.com>
> Sent: Friday, July 28, 2017 12:25:54 PM
> To: Vijaya Kumar Regati
> Cc: vijaykr....@gmail.com; r-help@R-project.org
> Subject: Re: [R] R Programming help needed - Returning dataframes + 2
> Variables dynamically
>
> 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.reg...@m3bi.com<mailto:vijayakumar.reg...@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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