isappdata

Create a figure window. Then, get the current time by using the date function.

Store the contents of d by using the setappdata function. In this case, store d in the figure using the name identifier 'todaysdate'.

f = figure;
d = date

d = 
'05-Sep-2024'

setappdata(f,'todaysdate',d);

Confirm that d is stored in the figure object under the specified name identifier.

isappdata(f,'todaysdate')

ans = logical
   1

Use application data to determine the value to assign to a variable.

Create a figure window and specify val. Store the contents of val in the figure object using the name identifier 'primary'.

f = figure;
val = {'Red','Yellow','Blue'};

setappdata(f,'primary',val);

Set the variable colors to a value that depends on the presence of application data by using conditional statements.

If there exists data associated with the name identifier 'primary' in the figure, assign this data to colors. Otherwise, assign new data to colors. Print the value of colors.

if isappdata(f,'primary')
    colors = getappdata(f,'primary')
else
    colors = {'Orange','Green','Purple'}
end

colors = 1x3 cell
    {'Red'}    {'Yellow'}    {'Blue'}