[R] integration in symbols

[Gabor Grothendieck]

The free yacas symbolic math package can output in C form and that is
often the same as R.  For example,

C:\usr\yacas>yacas
[... deleted startup message ...]
In> ToFile("out") WriteString(CForm(Integrate(x)1/x)); True;
Out> True;
In> quit
Quitting...

C:\usr\yacas>type out
log(x)
C:\usr\yacas>

... in R ...
> f <- function(x) NULL
> body(f) <- parse("/usr/yacas/out")
> f
function (x) 
log(x)
> 

With some effort you could probably make it even slicker.  
One method would be via the yacas dll.

---
Date:   Mon, 22 Mar 2004 01:18:07 -0600 
From:   Erin Hodgess <hodgess at gator.uhd.edu>
To:   <r-help at stat.math.ethz.ch> 
Subject:   [R] integration in symbols 

 
Dear R People:

Are there any functions for integration in R, please?
Not integrate....That return a numeric value.
I mean symbolic integration...the moral equivalent
of D and deriv, please.

Thanks in advance!

Sincerely,
Erin Hodgess
Associate Professor
Department of Computer and Mathematical Sciences
University of Houston - Downtown
mailto: hodgess at gator.uhd.edu