R help - Jan 2013 - a question about the computation of expression

Hi all:
I have a question about the computation of expression:
y = 1+(2x1+2)-3*(5x1-1)+(3x2+3)-2*(x2-1)
 
The result of y is:
y = 11-13x1+x2
 
How can I compute the result of y via R function?

Many thanks!

My best.

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Hi
> -----Original Message-----
> From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-
> project.org] On Behalf Of meng
> Sent: Friday, January 04, 2013 8:00 AM
> To: R help
> Subject: [R] a question about the computation of expression
> 
> Hi all:
> I have a question about the computation of expression:
> y = 1+(2x1+2)-3*(5x1-1)+(3x2+3)-2*(x2-1)
> 
> The result of y is:
> y = 11-13x1+x2
> 
> How can I compute the result of y via R function?
Dou you have x1 and x2? If yes and they are vectors with the same length

y = 11-13*x1+x2

shall do the computation.

Or maybe I did not understand what do you want.

Regards
Petr
> 
> Many thanks!
> 
> My best.
> 
> 	[[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.

Dear meng,

Check I understood correctly, the Ryacas package might do what you want.
 Check its vignette at
http://cran.r-project.org/web/packages/Ryacas/vignettes/Ryacas.pdf

Best,
Jorge.-


On Fri, Jan 4, 2013 at 5:59 PM, meng <> wrote:
> Hi all:
> I have a question about the computation of expression:
> y = 1+(2x1+2)-3*(5x1-1)+(3x2+3)-2*(x2-1)
>
> The result of y is:
> y = 11-13x1+x2
>
> How can I compute the result of y via R function?
>
> Many thanks!
>
> My best.
>
>         [[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]]