Parametric to Differential

*To*: mathgroup at yoda.physics.unc.edu*Subject*: Parametric to Differential*From*: "ALDO-PIER SOLARI" <G321964 at cicei.ulpgc.es>*Date*: Sun, 2 Jan 1994 03:12:50 GMT

I would need some help regardin the following task: I have developed a highly complex model (fish pop. dynamics). There are 2 parametric equations which I would Mathematica to crunch into a differential equation. What functions do I have to use in Mathematica to carry on the operation ? The equations are of the type: F1(x) = (b-c/2)+(((cos(2*pi/tp*8x-i)^[2*ceil(rnd(m))-1])-1)+ ... F2(x) = ((-(h*m*pi)/2*tp))*((cos(2*pi/tp*8x-i)))^[2*ceil(rnd(m-2))- 1]) ... F1(x) against x describes stock in time; F2(x) against x describes the recruitment rate in time; F2(x) as dependent (y axis) against F1(x) dexcribes the state space. Please, refer even to pp in the manuals. Any help shall be welcome. Regards, Aldo-Pier. ---------------------------------------------- (*) Aldo-Pier Solari [MSc, PhD cand.], Fisheries Research Group, University of Las Palmas [ULP], Box 50, 35017 LAS PALMAS - CANARY ISLANDS [Spain] International: <SOLARIS at OBERON.ULPGC.ES>, <SOLARIS at EDI.ULPGC.ES>; Local: <G321964 at CICEI.ULPGC.ES>; fax: <34 (28) 45 29 22>. ----------------------------------------------