ode_discrete

Scilab Function
Last update : February 1998

ode_discrete - ordinary differential equation solver, discrete time simulation

### Calling Sequence

  `y=ode("discrete",y0,k0,kvect,f)`

### Parameters

- `y0` : real vector or matrix (initial conditions).
- `t0` : real scalar (initial time).
- `f` : external i.e. function or character string or list.
- `k0` : integer (initial time).
- `kvect` : integer vector.

### Description

With this syntax (first argument equal to `"discrete"` ) `ode` computes recursively `y(k+1)=f(k,y(k))` from an initial state `y(k0)` and returns `y(k)` for `k` in `kvect` . `kvect(1)` must be greater than or equal to `k0` .

Other arguments and other options are the same as for `ode` , see the ode help.

### Examples

    y1=[1;2;3]; deff("yp=a_function(k,y)","yp=A*y+B*u(k)")
    A=diag([0.2,0.5,0.9]); B=[1;1;1];u=1:10;n=5;
    y=ode("discrete",y1,1,1:n,a_function);
    y(:,2)-(A*y1+B*u(1))
    // Now y evaluates  at [y3,y5,y7,y9]
    y=ode("discrete",y1,1,3:2:9,a_function)

### See Also

`ode` ,