Matlab function for discrete Walsh function generation.

Recursive Matlab function to determine a specific Walsh function given an order and index.

y = walshGenerator(N,K)

This function determine the Discrete Walsh function number N of order 2^K
using a recursive algorithm for lower memory requirements. N is a natural
number that ranges from 0 to 2^K-1, being N=0 the Walsh function without
zero crossings and N = 2^K-1 the Walsh function with the maximum
zero crossings (sequency order). This algorithm was been applied according to the
reference:
M. I. Irshid, "A Simple Recursive Definition for Walsh Functions,"
in IEEE Transactions on Electromagnetic Compatibility, vol. 28, no. 4,
pp. 276-279, Nov. 1986. doi: 10.1109/TEMC.1986.4307301
URL: http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=4307301&isnumber=4307283

Matlab function developed under the project Single-pixel-imaging of the University of Coimbra (Portugal).
If you use this function in your work please cite as:

Pedro G. Vaz, "Matlab recursive function for discrete Walsh function
generation (walshGenerator)", MATLAB Central File Exchange, University of Coimbra, Portugal (2019).

Pedro G.Vaz @ Universidade de Coimbra 2019
Cite As

Pedro (2019). Matlab function for discrete walsh function generation. (https://www.mathworks.com/matlabcentral/fileexchange/73545-matlab-function-for-discrete-walsh-function-generation), MATLAB Central File Exchange. Retrieved December 4, 2019.

Pedro G. Vaz, "Matlab recursive function for discrete Walsh function generation (walshGenerator)", MATLAB Central File Exchange, University of Coimbra, Portugal (2019).