R help - Oct 2005 - symbolic math

Hi all!

Does anyone knows if it exists a "symbolic math" package in R, that
allows to compute derivatives, integrals, etc.?

Does exist a freeware version of Maple?

Cheers,

Marco



	[[alternative HTML version deleted]]

Hi,

> -----Original Message-----
> [mailto:r-help-bounces at stat.math.ethz.ch] On Behalf Of 
> Giannitrapani, Marco GSUK-GSSC
> Subject: [R] symbolic math
> 
> Does anyone knows if it exists a "symbolic math" package in 
> R, that allows to compute derivatives, integrals, etc.? 
Have a look at:
?D
> 
> Does exist a freeware version of Maple?
Not really a free version of Maple, but I use Maxima. You can find it
at:
http://maxima.sourceforge.net/

There you can do things like (just a simple, stupid example):
(%i1) diff(3*x^2,x);
(%o1) 				      6 x
(%i2) integrate(6*x, x);
	   						2
(%o2) 				     3 x
(%i3) 


(the spacing is a bit unfortunate in my email now)

Best, Roland

+++++
This mail has been sent through the MPI for Demographic Rese...{{dropped}}

On Wednesday 26 October 2005 10:55, Giannitrapani, Marco GSUK-GSSC
wrote:
> Hi all!
>
> Does anyone knows if it exists a "symbolic math" package in R,
that allows
> to compute derivatives, integrals, etc.?
>
> Does exist a freeware version of Maple?
>
> Cheers,
>
> Marco
>
I've just learned yesterday the use of "expressions" objects to
compute
derivatives. There might be functions for doing integrals as well.

1) define an expression using whatever symbol you like

example:
> exp1 <- expression(cos(x)+sin(y))
2) Use function D() to perform symbolic derivatives:

example:
> D(exp1,"x")
-sin(x)
> D(exp1,"y")
cos(x)

 You can find this stuff in "R for Beginners", by Emmanuel Paradis 
(http://www.r-project.org/)

Cheers,

J

-- 
Dr James Foadi PhD
York Structural Biology Laboratory (YSBL)
Department of Chemistry
University of York
Heslington
York YO10 5YW
UK

> -----Original Message-----
> From:	r-help-bounces at stat.math.ethz.ch [SMTP:r-help-bounces at
stat.math.ethz.ch] On Behalf Of Giannitrapani, Marco GSUK-GSSC
> Sent:	Wednesday, October 26, 2005 7:56 AM
> To:	r-help at stat.math.ethz.ch
> Subject:	[R] symbolic math
> 
> Hi all!
> 
> Does anyone knows if it exists a "symbolic math" package in R,
that allows to compute derivatives, integrals, etc.?
> 
> Does exist a freeware version of Maple?
> 
--------
I think Maxima is pretty cool:
http://maxima.sourceforge.net/
Ruben

Yet another option is "axiom"

In a debian-type linux:

apt-get install axiom


On Wed, 26 Oct 2005, Ruben Roa wrote:
>> -----Original Message-----
>> From:	r-help-bounces at stat.math.ethz.ch [SMTP:r-help-bounces at
stat.math.ethz.ch] On Behalf Of Giannitrapani, Marco GSUK-GSSC
>> Sent:	Wednesday, October 26, 2005 7:56 AM
>> To:	r-help at stat.math.ethz.ch
>> Subject:	[R] symbolic math
>>
>> Hi all!
>>
>> Does anyone knows if it exists a "symbolic math" package in
R, that allows to compute derivatives, integrals, etc.?
>>
>> Does exist a freeware version of Maple?
>>
> --------
> I think Maxima is pretty cool:
> http://maxima.sourceforge.net/
> Ruben
>
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>
Paulo Justiniano Ribeiro Jr
LEG (Laborat?rio de Estat?stica e Geoinforma??o)
Departamento de Estat?stica
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