spiral_decomp

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

Description

INPUTS
------
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

• MATLAB release: MATLAB 7.5 (R2007b)
• Other requirements: Requires matrix_perimeter.m which can be found in Matlab File Exchange Repository.