User`s guide

Time Data Updates from a GUI (GUIDE)

In this section...

“About the Timer GUI Example” on page 10-105

“View and Run the GUIDE Timer GUI” on page 10-106

“Components Used by the Timer GUI” on page 10-107

“How the GUI Implements the Timer” o n page 10-109

“Other Uses for Timers in GUIs” on page 10-112

About the Timer GUI Example

This example shows how to refresh a display by incorporating a timer in a

GUI that updates data. Timers are MATLAB objects. Programs use their

properties and methods to schedule tasks, update information, and time o ut

processes. For example, you can set up a timer to acquire real-time data at

certain intervals, which your GUI then analyzes and displays.

The GU I displays a surface plot of the

peaks function and contains 3

uicontrols:

• The Start Randomizing push button — Starts the timer running, which

executes at a rate determined by the slider control. At each iteration,

random noise is added to the surface plot.

• The Stop Randomizing push button — H alts the timer, leaving the

surface plot in its current state until you click the Start Randomizing

button again.

• The Timer Period slider — Speeds up and slows down the timer, changing

its period within a range of 0 .01 to 2 seconds.

The following illustrations show the GUI. The left shows the initial state of

the GUI. The right shows the GUI after running the timer for 5 seconds at its

default period of 1 count per second.

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