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Preallocate Arrays of Graphics Objects

Use the gobjects function to preallocate arrays for graphics objects. You can fill in each element in the array with a graphics object handle.

Preallocate a 4-by-1 array:

h = gobjects(4,1);

Assign axes handles to the array elements:

for k=1:4
   h(k) = subplot(2,2,k);

gobjects returns a GraphicsPlaceholder array. You can replace these placeholders elements with any type of graphics object. You must use gobjects to preallocate graphics object arrays to ensure compatibility among all graphics objects that are assigned to the array.