Hi Katherine,
I understand that you're interested in verifying whether a uifigure is populated or not and, if so, you'd like to remove the graphs for subsequent functions. To accomplish this, you can make use of the "Children" property of the uifigure. Please refer to the example below, which checks for the presence of a graph on the uifigure:
% Create a uifigure
fig = uifigure;
% Populate a graph onto the figure
ax = uiaxes(fig);
x = 0:0.01:2*pi;
plot(ax,x,sin(x));
% Check for the Children
fig.Children
% You can put a check on the length for the if condition
length(fig.Children)
% Clear / remove the Children
delete(fig.Children)
% Check for the Children
fig.Children
length(fig.Children)
If you are specifically interested in checking whether the graph is populated or not, you can examine the "Children" property of the axes as well:
ax.Children
Hope this information helps you address the issue.
