nlsrk (version 1.1)

sys: Right side of a first order differential equation system (multivariate)

Description

sys gives the set of derivatives of a first order differential equation system. The functions must be provided by user. Edit and change sys.

Usage

sys()

Value

A numeric vector of the nfonct functions at time t

Details

sys has no arguments but the componing functions must have three : t, y param. sys returns the rights sides of the set of nfonct functions.

References

any mathematical textbook

See Also

evrunge, multirunge, nls

Examples

	evrunge(seq(0,10,0.1),c(1,1),y0=c(1000,0),sys=sys,graph=TRUE)