Thanks guys, Ryacas is pretty much what I'm looking for!However, I can't
seem to get it to work properly.
For example:
> yacas("Integrate(x) x")
Error in parse(text = text, srcfile = NULL) :
unexpected numeric constant in ""/" ("^" (x ,2 2"
Same thing with expressions such as yacas("x*x")
However
> yacas("2*2")
expression(4)
So it seems there is a successful connection between yacas and R.
I didn't find any info on the problem by googling it unfortunately! Any
ideas what it might be?
Thanks again,
M
On Thu, Oct 1, 2009 at 3:50 PM, Jorge Ivan Velez
<jorgeivanve...@gmail.com>wrote:
> Hi Zemajik,
> Try this:
>
> > y <- function(a) paste(a, '*x', sep="")
> > y(2)
> [1] "2*x"
>
> Also, take a look at the Ryacas package.
>
> HTH,
> Jorge
>
>
> On Thu, Oct 1, 2009 at 9:46 AM, ZeMajik <> wrote:
>
>> Hey,
>> I'm trying to find how to perform operations with a variable treated as a
>> symbol.
>> For, an extremely simple, example I want to integrate a*x with respect to
>> x
>> and I want to find the indefinite integral of this, (a*x^2/2), or the
>> definite integral with some interval for x.
>>
>> Another example of such a use would be to create a function
>> y<-function(x) {a*x}
>> and by typig y(2) I would get the result 2*a
>>
>> Is there a way to treat variables as merely "symbols"?
>> Any help much appreciated
>>
>> -M
>>
>> [[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]]
______________________________________________
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.
