Implementing Comparator In Simulink

Use Relational Operator

Build Sample And Hold Model Using Simulink

Simulink Debug Command Line Semantics

>> sldebug  'model_name'

Simulink Method & Method Call Stack

Simulink Execution Phases

Two Switches In Simulink

Switch & Multiport Switch

Log Simulink Signal Data

Right click on a signal in Simulink model, and press "properties"

Execution Of Stateflow Chart

By default, Stateflow charts execute once for each active input event.  If no input events exist, the charts execute once every time step. That means were you to use a solver with variable step, the charts may get executed at time step not evenly distributed.

Consider the following simulink model,

the chart is very simple as shown below.

Now, if you run the simulation with a solver w/ variable-step and set the Max step size to be 1,  your chart will be awakened at 0s, 1s, 2s, 3s, 4s, 5s, as is evidence by the chart output y.


Suppose, you would like to add a source, a step, say, somewhere in the simulink model, and set the step time @1.5s,


Since 1.5 is not a integer, solver that with variable simulation step will add additional point in its simulation time list (shown below):

As can be seen, when the step block is added into the Simulink model, the solver will simulate at 3 more instants (1.4999,1.5,1.50001), so the stateflow chart will have a totally different response in that case.

Get List Of All Simulation Time Of Simulink

Use Clock block.

Show Simulink Sample Time Legend

in Simulink, press Ctrl-j

Simulink Variable Step Simulation

For Simulink variable step simulation, the Max step size option is by default set by:


so, e.g. if start time is 0 and stop time is 10, then, the default (auto) Max step size is 0.2s

Set Time Range For Signal Builder

In Signal Builder:
Axes --> Change Time Range

"Diagnostic for default case" for Multiport Switch (Simulink)

Using Multiple Events in A Chart

When the Mux block is connected to the trigger port on top of the Stateflow chart, the index of the signals in the array is associated with the numbered ports.

Set Initial Value for Simulink Integration Operation