spiral_decomp

Function spiral_decomp decomposes a given matrix into a row vector following spiral order.

INPUTS
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A = An n x m matrix (real or complex)

OUTPUTS
-------
y = An (1 x (n * m) ) vector containing the elements of A taking in spiral order.

COMPATIBILITY
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Matlab 7.2 and later

NOTE
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This function utilizes function matrix_perimeter.m

EXAMPLE
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>> A=magic(5)

A =

17 24 1 8 15
23 5 7 14 16
4 6 13 20 22
10 12 19 21 3
11 18 25 2 9

>> x=spiral_decomp(A)

x =

Columns 1 through 14

17 24 1 8 15 16 22 3 9 2 25 18 11 10

Columns 15 through 25

4 23 5 7 14 20 21 19 12 6 13