Interface Flashcards

Which MATLAB function creates a toolbar button on a figure's toolbar?

Answer: uipushtool

uipushtool adds a push button to a uitoolbar object, which itself is attached to a figure.

What is the purpose of the 'UserData' property available on all MATLAB graphics objects?

Answer: Store arbitrary user-defined data attached to the object

UserData can hold any MATLAB variable, providing a convenient way to attach custom data to any graphics handle.

In MATLAB, which function allows you to programmatically simulate a button click on a uicontrol?

Answer: uicontrol callbacks must be called directly

There is no built-in clickbutton function; to trigger behavior you invoke the callback function directly with the required arguments.

Which property of a MATLAB edit box (uicontrol Style='edit') allows multiline text input?

Answer: Max set to a value greater than 1

Setting Max > 1 (typically Max=2) on an edit uicontrol enables multiline input with scrolling.

In App Designer, what does the startup function (startupFcn) allow you to do?

Answer: Initialize component values and app state before the UI is shown

startupFcn runs automatically after the app is created, making it the correct place to initialize data and set default component values.

Which MATLAB function returns the handle of the currently active figure?

Answer: gcf

gcf (get current figure) returns the handle of the figure that most recently had focus or was interacted with.

What does the 'Position' property of a MATLAB figure specify?

Answer: [left, bottom, width, height] in units relative to the screen

Position is a four-element vector [left, bottom, width, height] measured from the bottom-left of the primary display in the current Units.