Calculate the mean of corner elements of a matrix.
e.g. a=[1 2 3;
4 5 6;
7 8 9;]
Mean = (1+3+7+9)/4 = 5
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Doubling elements in a vector
find the maximum element of the matrix
find the surface area of a cube
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Let's get back to school: create mixed numbered fraction
Find supported functions
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