`odeprint`

ODE output function: prints the time and state at each step.

Category: Other public functions: funfun

Syntax

status = odeprint(t, y, flag)

Output-function form: called by the solver at the start, at each accepted step and at the end.

Description

Set it with odeset('OutputFcn', @odeprint) to see the numbers the solver produces while it runs, which is handy to debug a model or to see the step size choice. With a tspan of more than two elements the solver reports exactly at those times.

Input arguments

t, y: Time points and state columns passed in by the solver.
flag: 'init', '' or 'done'.

Output arguments

status: Logical, true to stop the solver. Always false here.

Example

Print at chosen times

opts = odeset('OutputFcn', @odeprint);
[t, y] = ode45(@(t, y) -y, [0 0.1 0.2], 1, opts);

Output

t = 0
y = 1
t = 0.1000
y = 0.9048
t = 0.2000
y = 0.8187

odeprint