firstmax.m

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function X = firstmax(Data,Window)
% Find first maximum in transient response
%
% function X = firstmax(Data,Window)
%
% Data    Time series of process output
% Window  Width of window
% X       Index of first maximum in Data
%
% It scans Data from the left looking at a
% portion at a time. The current point is in
% the middle of the window. The current point
% is a maximum if it is the largest value in
% the window. If not, move window right.

% Jantzen 940410

N = length(Data) ;
W = round(Window/2) ;
Current = W + 1;
X = [] ;
while (Current < N) & isempty(X),
  TestSet = Data(max((Current-W),1):min(Current+W,N)) ;
  Imax = find(TestSet == max(TestSet)) ;
  if any(Imax < W) | any(Imax == length(TestSet)),    % max on boundary ;
    DCurrent = W ;
  else                                                 % max interior ;
    DCurrent = max(- W - 1 + Imax, 0) ;
  end ;
  if DCurrent == 0,
    X = Current ;
  else
    Current = Current + DCurrent ;
  end ;
end ;