modelLags.m

% Obtain a vector formed by integers corresponding to the ASCII code of u or y of the identified terms 
% and the correspondibg lags. It is used during the identification of the NARMAX model to read 
% the vector of strings D.
%
% written by: Renato Naville Watanabe 
%
% ind = modelLags(D)
%	
% Inputs:
%
%   D: cell, contains the strings with the terms of a NARX model.
%
%   
% Outputs:
%
%   ind is a vector with the following format:
%   ___________________
%   | 117 or 121 or 101|  % 117 corresponds to the input u, 121  to output y and 101 to the residue e.
%   |      lag         |  % lag corresponds to the lag of the signal in the preceding cell.
%   this format of vector continues to represent a term of multiplied inputs, outputs and residue.
%   Example:
%   u(k-1)u(k-2)y(k-5)e(k-2) corresponds to:
%         ___________
%         |   117   |
%         |    1    |
%   ind = |   117   |
%         |    2    |
%         |   121   |
%         |    5    |
%         |   101   |
%         |    2    |
%         |_________|
%

function ind = modelLags(D)
    for j = 1:length(D)
       I{j} = sscanf(D{j}, '%c(k-%d)'); 
    end
    ind = I;
end