Write a Matlab code to calculate the standard deviation of a

Write a Matlab code to calculate the standard deviation of an image A with size
     (h × w).

Please give lines of code not just a description.

Thanks

Solution

example code for standard deviation of an image A is

here is h is 3 and w is 3 so 3 * 3 A matrix

>> A=[-1 2 3; 4 -5 6; 7 8 -9]

A =

    -1     2     3
     4    -5     6
     7     8    -9

>> S = std(A)

S =

    4.0415    6.5064    7.9373

>>