Commit 1b9b5ea0 authored by Julius Welzel's avatar Julius Welzel

Upload New File

parent 7f03701d
function width = fwhm(x,y)
% function width = fwhm(x,y)
%
% Full-Width at Half-Maximum (FWHM) of the waveform y(x)
% and its polarity.
% The FWHM result in 'width' will be in units of 'x'
%
%
% Rev 1.2, April 2006 (Patrick Egan)
y = y / max(y);
N = length(y);
lev50 = 0.5;
if y(1) < lev50 % find index of center (max or min) of pulse
[garbage,centerindex]=max(y);
Pol = +1;
% disp('Pulse Polarity = Positive')
else
[garbage,centerindex]=min(y);
Pol = -1;
% disp('Pulse Polarity = Negative')
end
i = 2;
while sign(y(i)-lev50) == sign(y(i-1)-lev50)
i = i+1;
end %first crossing is between v(i-1) & v(i)
interp = (lev50-y(i-1)) / (y(i)-y(i-1));
tlead = x(i-1) + interp*(x(i)-x(i-1));
i = centerindex+1; %start search for next crossing at center
while ((sign(y(i)-lev50) == sign(y(i-1)-lev50)) & (i <= N-1))
i = i+1;
end
if i ~= N
Ptype = 1;
% disp('Pulse is Impulse or Rectangular with 2 edges')
interp = (lev50-y(i-1)) / (y(i)-y(i-1));
ttrail = x(i-1) + interp*(x(i)-x(i-1));
width = ttrail - tlead;
else
Ptype = 2;
% disp('Step-Like Pulse, no second edge')
ttrail = NaN;
width = NaN;
end
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