Example of Core objects:

The one core graphics object is a line that is also what the plot function produces. Here is an illustration of generating a line object, altering some properties, and saving the handle in a variable hl:

>> x = -2*pi: 1/5 : 2*pi;

>> y = sin(x);

>> hl = line(x,y,'LineWidth', 3, 'Color', [0.5 0.5 0.5])

hl =

   159.0405

As shown in figure below, this draws a reasonably thick grey line for the sin function. As the handle will be valid as long as the Figure Window is not closed. A few of the properties of this object are as shown below:

>> get(hl)

Color = [0.5 0.5 0.5]

EraseMode = normal

LineStyle = -

LineWidth = [3]

Marker = none

MarkerSize = [6]

t = auto

MarkerFaceColor = none

XData = [ (1 by 63) double array]

YData = [ (1 by 63) double array]

ZData = []

etc.