R help - Jun 2013 - what is the difference between the function "expand.grid" and "data.frame"?

Hello everyone,

i found that both of the 2 functions ("expand.grid" and
"data.frame") can
be used to produce data frame. are there any difference between them?

thanks for your help!

zhaoran

	[[alternative HTML version deleted]]

Why don't you try it and see?

data.frame(x=1:5, y=letters[1:5])
expand.grid(x=1:5, y=letters[1:5])

?data.frame
?expand.grid

On Fri, Jun 28, 2013 at 8:30 AM, Zhaoran Zhou <zhaoran1124 at gmail.com>
wrote:
> Hello everyone,
>
> i found that both of the 2 functions ("expand.grid" and
"data.frame") can
> be used to produce data frame. are there any difference between them?
>
> thanks for your help!
>
> zhaoran
>
>         [[alternative HTML version deleted]]
>
> ______________________________________________
> R-help at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide
http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.

Just have a look at the two help pages ?expand.grid and ?data.frame.

R experts will wince but I believe that you can think of a data.frame as one
type of R object and expand.grid as one very specialized way to create a
data.frame.

I guess you can say one is an object and the other is a function to create such
an object.

John Kane
Kingston ON Canada

> -----Original Message-----
> From: zhaoran1124 at gmail.com
> Sent: Fri, 28 Jun 2013 15:30:44 +0300
> To: r-help at r-project.org
> Subject: [R] what is the difference between the function
"expand.grid"
> and "data.frame"?
> 
> Hello everyone,
> 
> i found that both of the 2 functions ("expand.grid" and
"data.frame") can
> be used to produce data frame. are there any difference between them?
> 
> thanks for your help!
> 
> zhaoran
> 
> 	[[alternative HTML version deleted]]
> 
> ______________________________________________
> R-help at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide
> http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
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H
ello,

Did you read ?data.frame and ?expand.grid.
> data.frame(x=1:2, y=1:2)
  x y
1 1 1
2 2 2
> expand.grid(x=1:2, y=1:2)
  x y
1 1 1
2 2 1
3 1 2
4 2 2

There is a small difference, isn't it?

Regards,
Pascal


2013/6/28 Zhaoran Zhou <zhaoran1124@gmail.com>
> Hello everyone,
>
> i found that both of the 2 functions ("expand.grid" and
"data.frame") can
> be used to produce data frame. are there any difference between them?
>
> thanks for your help!
>
> zhaoran
>
>         [[alternative HTML version deleted]]
>
> ______________________________________________
> R-help@r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide
> http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>
	[[alternative HTML version deleted]]