Dear Ravi, R calls many functions that are written in FORTRAN. As a start on how to do this, perhaps look at the cluster package.
Regards, Andrew C. Ward CAPE Centre Department of Chemical Engineering The University of Queensland Brisbane Qld 4072 Australia [EMAIL PROTECTED] Quoting Ravi Varadhan <[EMAIL PROTECTED]>: > Hi: > > I have written a Fortran program based on the > Gaver-Stehfest algorithm, > which uses only real numbers (as opposed to the more > powerful methods > using complex numbers). However, this can't be used in R > since the > function specifying the inverse of the Laplace transform > must also be > written in Fortran. I would be interested in learning > how to define > the function in R and then calling the Fortran > subroutines to do the > inverse computations. Can anyone tell me how to do this? > > thanks, > Ravi. > > ----- Original Message ----- > From: "Andrew C. Ward" <[EMAIL PROTECTED]> > Date: Friday, September 5, 2003 1:03 am > Subject: Re: [R] laplace transform > > > Dear Luca, > > > > I don't think that R has a built-in function for doing > > Laplace or inverse Laplace transforms. I remember > having to > > use an IMSL routine (INLP, I think) to do this many > years > > ago. When I looked at the article that the algorithm > was > > based on, I found that as an example the author showed > how > > well the method worked when inverting 1/s! Presumably, > > > things have improved since then. > > > > A Google search of (numerical "inverse laplace > transform") > > yields a number of references that should get you > started. > > If you write some R code to do this, think about > submitting > > it to CRAN. Even though a lot of R/S code is devoted > to > > statistical methods, there's no reason at all why all > kinds > > of other things can't be written. > > > > > > Regards, > > > > Andrew C. Ward > > > > CAPE Centre > > Department of Chemical Engineering > > The University of Queensland > > Brisbane Qld 4072 Australia > > [EMAIL PROTECTED] > > > > > > Quoting Luca Laghi <[EMAIL PROTECTED]>: > > > > > Dear users, > > > is anybody of you aware of a R command to perform > laplace > > > transform or > > > even its inversion? > > > Thank you very much. > > > Luca > > > > > > ______________________________________________ > > > [EMAIL PROTECTED] mailing list > > > > https://www.stat.math.ethz.ch/mailman/listinfo/r-help > > > > > > > ______________________________________________ > > [EMAIL PROTECTED] mailing list > > https://www.stat.math.ethz.ch/mailman/listinfo/r-help > > > > ______________________________________________ [EMAIL PROTECTED] mailing list https://www.stat.math.ethz.ch/mailman/listinfo/r-help
