On Wed, 2004-08-25 at 23:44, Peter Dalgaard wrote: > "Ronaldo Reis Jr." <[EMAIL PROTECTED]> writes: > > > Is possible to integrate this diferential equation: > > > > dN/dt = Nr(1-(N/K)) > > > > in R using the integrate() function? > > No. > However, you could use
N = K/(1 + exp(log((K-N0)/K) -r*t)), where N0 is the population size at t=0 (that you must fix or estimate). Causton has a long discussion about integrating this funcition on in his "Mathematics for Biologists" (or something like that). Apart from that MuPad may be free for Linux, and you can buy many other alternatives for symbolic mathematics (Maple is available for Linux, at least). It may be that you still have to work to get the solution you need, even with snappy tools like that. cheers, jari oksanen -- Jari Oksanen <[EMAIL PROTECTED]> ______________________________________________ [EMAIL PROTECTED] mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
