dscr discretization of linear system

## Syntax

                [sld, r] = dscr(sl, dt)
                [sld, r] = dscr(sl, dt, m)

## Arguments

sl

  `syslin` list containing `[A,B,C,D]`.

dt

  real number, sampling period

m

  covariance of the input noise (continuous time)(default value=0)

r

  covariance of the output noise (discrete time) given if `m` is given as input

sld

  sampled (discrete-time) linear system, `syslin` list

## Description

Discretization of linear system. `sl` is a continuous-time system:

`dx/dt=A*x+B*u (+ noise)`.

`sld` is the discrete-time system obtained by sampling `sl` with the sampling period `dt`.

## Examples

    s=poly(0,'s');
    Sys=syslin('c',[1,1/(s+1);2*s/(s^2+2),1/s])
    ss2tf(dscr(tf2ss(Sys),0.1))

## See also

- syslin
- flts
- dsimul