isgraphics to determine
if a variable is a valid graphics object handle. A handle variable
h in this case) can still exist, but not be a
valid handle if the object to which it refers has been deleted.
h = plot(1:10); ... close % Close the figure containing the plot whos
Name Size Bytes Class Attributes h 1x1 104 matlab.graphics.chart.primitive.Line
Test the validity of
ans = 0
For more information on deleted handles, see Deleted Handle Objects.