Algorithm (Workflow)

This function, gcfSG, is a custom implementation of MATLAB's gcf function. It is designed to return the handle of the current figure window, or an empty array if no figure window is open. This is useful for checking the existence of an open figure without causing an error if none exists.

Input Parameters

The function gcfSG does not take any input parameters. It operates on the current state of the MATLAB environment.

Output

• h: This is the handle to the current figure window. If no figure window is open, h will be an empty array.

Algorithm Explanation

The function uses the get function in combination with groot to access the root object of the MATLAB graphics system. The root object is queried for the 'CurrentFigure' property, which returns the handle of the current figure window if one is open. If no figure is open, it returns an empty array.

Example Usage

The function can be used in a MATLAB script or command window as follows:

close all; 
h = gcfSG; % This will return an empty array since all figures are closed.

Another example is:

figure; % Open a new figure window.
h = gcfSG; % This will return the handle to the newly opened figure.

Related Functions

• gcf: Standard MATLAB function to get the current figure handle.
• figureisopen: A function to check if any figure windows are open.