# Controlz.jl

`Controlz.jl`

is a Julia package to analyze and simulate process dynamics and control systems using transfer function representations.

for example, to simulate the unit step response of a second-order, underdamped system characterized by the transfer function

\[g(s) = \dfrac{4}{4s^2 + 0.8s +1}\]

the output $Y(s)$ follows from $g(s)U(s)$, where $U(s)$ is the input.

```
using Controlz
g = 4 / (4 * s ^ 2 + 0.8 * s + 1) # construct transfer function
U = 1 / s # unit step input, U(s)
Y = g * U # system output, Y(s)
data = simulate(Y, 50.0) # simulate until t = 50
viz_response(data, plot_title="SO underdamped step response")
```

# install the `Controlz.jl`

package in Julia

- in the Julia REPL: go into package mode by typing
`]`

. then`add Controlz`

. then`Backspace`

to exit package mode. - in a Jupyter or Pluto Notebook:
`using Pkg; Pkg.add("Controlz")`

. (this way also works in the REPL)

for visualizations, `Controlz.jl`

relies on `PyPlot.jl`

, a Julia interface to matplotlib in Python. see here if you have trouble installing `PyPlot.jl`

.