MATLAB: Can I run a loop with image variables that have different dimensions

dimensionimageimage variableMATLAB

Apologies if there is an obvious answer I'm missing.
I've got images stored as variables, but they've got different dimensions.
I've got this function to calculate the average RGB value of each image:
mean(reshape(I1, [], 3))
But I don't know how to make a loop that will run through each variable. I've tried to make it a list like this
a = [I1 I2 I3 I4 I5 I6 I7 I8]
But the dimensions are not the same, and it would be ideal if I did not have to edit the images further. Any help, or do I need to resize?

Best Answer

Make a cell of the images and loop through the cell:
a = {I1 I2 I3 I4 I5 I6 I7 I8};
n = length(a);
for i = 1:n
  % Do some stuff
end
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