R help - Mar 2017 - Override/Insert (Change) a value (default value) inside a function

Hi!, 

Lets I have a function form a package. 
The function is,  as an example, 

myplot <- function(x,y) { plot(x,y) }


Now I can use the function according to function's defined argument. 

x<- sort(runif(200))
y<- 1:200
myplot(x,y)

Now I want to input extra argument or override default value of plot inside the
function myplot.

If I use  myplot (x,y, col = "red", cex = 0.1 )  it does not work . I
clearly understand , why it does not work .
But in this situation how can i solve the problem ? 

I will be grateful if any one can help. 
Thanks in advance !!
 
Tanvir Ahamed 
G?teborg, Sweden  |  mashranga at yahoo.com

Dear Mohammad Tanvir Ahamed,


Re:
> Hi!, 
> 
> Lets I have a function form a package. 
> The function is,  as an example, 
> 
> myplot <- function(x,y) { plot(x,y) }
> 
> 
> Now I can use the function according to function's defined argument. 
> 
> x<- sort(runif(200))
> y<- 1:200
> myplot(x,y)
> 
> Now I want to input extra argument or override default value of plot inside
the function myplot.
> 
> If I use  myplot (x,y, col = "red", cex = 0.1 )  it does not work
. I clearly understand , why it does not work .
> But in this situation how can i solve the problem ? 
> 


That's where the three-dot argument is for.

See "Introduction to R", paragraph 10.4 The ??? argument.

Succes and
best regards,

Frank
---


Franklin Bretschneider
Dept of Biology
Utrecht University
bretschr at xs4all.nl

On 12/03/17 10:26, Mohammad Tanvir Ahamed via R-help
wrote:
> Hi!,
>
> Lets I have a function form a package.
> The function is,  as an example,
>
> myplot <- function(x,y) { plot(x,y) }
>
>
> Now I can use the function according to function's defined argument.
>
> x<- sort(runif(200))
> y<- 1:200
> myplot(x,y)
>
> Now I want to input extra argument or override default value of plot inside
the function myplot.
>
> If I use  myplot (x,y, col = "red", cex = 0.1 )  it does not work
. I clearly understand , why it does not work .
> But in this situation how can i solve the problem ?
>
> I will be grateful if any one can help.
> Thanks in advance !!
Learn about the "..." argument.  See e.g. section 10.4 of "An 
Introduction to R" (first item under R home page -> Documentation -> 
Manuals).

cheers,

Rolf Turner


-- 
Technical Editor ANZJS
Department of Statistics
University of Auckland
Phone: +64-9-373-7599 ext. 88276

Thanks for reply.
as I said , the function in the package is like 
myplot <- function(x,y) { plot(x,y) }

not like 
myplot <- function(x,y) { plot(x,y,...) }

And I cant change the function inside the package!! 

So , in this case how to solve the problem ? 
 Tanvir Ahamed 
G?teborg, Sweden   |  mashranga at yahoo.com 


----- Original Message -----
From: Franklin Bretschneider <bretschr at xs4all.nl>
To: Mohammad Tanvir Ahamed <mashranga at yahoo.com>; R-help groep
<r-help at r-project.org>
Sent: Saturday, 11 March 2017, 22:45
Subject: Re: [R] Override/Insert (Change) a value (default value) inside a
function

Dear Mohammad Tanvir Ahamed,



Re:
> Hi!, 
> 
> Lets I have a function form a package. 
> The function is,  as an example, 
> 
> myplot <- function(x,y) { plot(x,y) }
> 
> 
> Now I can use the function according to function's defined argument. 
> 
> x<- sort(runif(200))
> y<- 1:200
> myplot(x,y)
> 
> Now I want to input extra argument or override default value of plot inside
the function myplot.
> 
> If I use  myplot (x,y, col = "red", cex = 0.1 )  it does not work
. I clearly understand , why it does not work .
> But in this situation how can i solve the problem ? 
> 


That's where the three-dot argument is for.

See "Introduction to R", paragraph 10.4 The ??? argument.

Succes and
best regards,

Frank
---


Franklin Bretschneider
Dept of Biology
Utrecht University
bretschr at xs4all.nl