MATLAB Mathematics - SERC - Index of

5 Differential Equations
Example: Cardiovascular Model
This example solves a cardiovascular model due to J. T. Ottesen [6]. The
equations are integrated over the interval [0,1000]. The situation of interest is
when the peripheral pressure R is reduced exponentially from its value of 1.05
to 0.84 beginning at t = 600.
This is a problem with one delay, a constant history, and three differential
equations with fourteen physical parameters. It has a discontinuity in a low
order derivative at t = 600.
Note The demo ddex2 contains the complete code for this example. To see the
code in an editor, click the example name, or type edit ddex2 at the command
line. To run the example type ddex2 at the command line. See “DDE Solver
Basic Syntax” on page 5-52 for more information.
In ddex2, the fourteen physical parameters are set as fields in a structure p
that is shared with nested functions. The function ddex2de for evaluating the
equations begins with
function dydt = ddex2de(t,y,Z)
if t