function [peakLabels,troughLabels] = classifyPeaks(Qd,P,T,th);
% go across entire signal, looking at narrow window around each peak
% try 1 second windows around each peak/trough, centered on found peak
% 1000 Hz signal decimated by 5, so now 200 Hz; 200 data pt window either side
peakLabels = []; % labels for type of peak: 1 = valid, 2 = invalid, 3 = question
troughLabels = []; % labels trough type: 1 = valid, 2 = invalid, 3 = question
validPeaks = [];
validTroughs = [];
thisPeakLabel = 0; thisTroughLabel = 0; i = 1;
% check if the first peak is too close to the start of the signal
if P(1) > 156
start = 1; % start at first - there's enough room for a window
else
while P(i) < 156
i = i + 1;
end;
start = i; % start at first peak higher than 101
end;
% check if the last peak is too close to the end of the signal
numPeaks = max(size(P));
if (P(numPeaks) + 156) < max(size(Qd))
stop = numPeaks; % stop at last peak
else
i = -1;
while (P(numPeaks + i) + 156) > max(size(Qd))
i = i - 1;
end;
stop = numPeaks + i;
end;
% first check all of the peaks
for i = start:stop
windowB4 = Qd((P(i)-150):P(i)); % window before the peak
windowAf = Qd(P(i):(P(i)+ 150)); % window after the peak
diffWB4 = diff(windowB4); % difference between all adjacent pts in the window
diffWAf = diff(windowAf);
[indNegB4] = find(diffWB4 < 0); % neg diff = curve going down
[indPosB4] = find(diffWB4 > 0); % pos diff = curve going up
[indNegAf] = find(diffWAf < 0); % neg diff = curve going down
[indPosAf] = find(diffWAf > 0); % pos diff = curve going up
negB4 = max(size(indNegB4)); % # of neg diffs before the peak
negAf = max(size(indNegAf)); % # of neg diffs after the peak
posB4 = max(size(indPosB4)); % # positive diffs before the peak
posAf = max(size(indPosAf)); % # positive diffs after the peak
thisPeakLabel = 1; % assume that most peaks are VALID
% start or end of window higher than peak
if windowB4(1) >= Qd(P(i)) | windowAf(150) >= Qd(P(i))
thisPeakLabel = 2; % label peak as invalid
a = 'start or end of window higher than peak'
end;
% more diffs in wrong direction on either side of peak than correct
% SHOULD be neg after and pos before
if negAf < negB4 | posB4 < posAf
thisPeakLabel = 2; % label peak as invalid
a = 'more diffs in wrong direction on either side of peak'
end;
% check amount of difference on each side of the peak
if sum(diffWB4) < 0 | sum(diffWAf) > 0
thisPeakLabel = 2; % label peak as invalid
a = 'too much in wrong direction around peak'
end;
peakLabels = [peakLabels, thisPeakLabel]; % add this peak label to the end of the list
end;
% add in labels for the first and last peaks, if needed
if start ~= 1
counter = 1;
while counter < start
peakLabels = [1, peakLabels]; % assign first peak as indeterminant
counter = counter + 1;
end;
end;
if stop ~= numPeaks
counter = 0;
while (numPeaks - stop) > counter
peakLabels = [peakLabels, 1]; % assign last peak as valid
counter = counter + 1;
end;
end;
%%%%%%%%%%%%%%%%%%%TROUGHS%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% check if the first trough is too close to the start of the signal
i = 1; % reset marker
if T(1) > 156
start = 1; % start at first - there's enough room for a window
else
while T(i) < 156
i = i + 1;
end;
start = i; % start at first trough higher than 101
end;
% check if the last trough is too close to the end of the signal
numTroughs = max(size(T));
if (T(numTroughs) + 156) < max(size(Qd))
stop = numTroughs; % stop at last trough
else
i = -1;
while (T(numTroughs + i) + 156) > max(size(Qd))
i = i - 1;
end;
stop = numTroughs + i;
end;
% check all of the troughs
for i = start:stop
windowB4 = Qd((T(i)- 150):T(i)); % window before the trough
windowAf = Qd(T(i):(T(i)+ 150)); % window after the trough
diffWB4 = diff(windowB4); % difference between adjacent pts in the window
diffWAf = diff(windowAf);
[indNegB4] = find(diffWB4 < 0); % neg diff = curve going down
[indPosB4] = find(diffWB4 > 0); % pos diff = curve going up
[indNegAf] = find(diffWAf < 0); % neg diff = curve going down
[indPosAf] = find(diffWAf > 0); % pos diff = curve going up
negB4 = max(size(indNegB4)); % # of neg diffs before the trough
negAf = max(size(indNegAf)); % # of neg diffs after the trough
posB4 = max(size(indPosB4)); % # positive diffs before the trough
posAf = max(size(indPosAf)); % # positive diffs after the trough
thisTroughLabel = 1; % assume most troughs valid
% start or end of window lower than marked trough
if windowB4(1) <= Qd(T(i)) | windowAf(150) <= Qd(T(i))
thisTroughLabel = 2; % label trough as invalid
a = 'start or end of window lower than marked trough'
end;
% more diffs in wrong direction on either side of trough than correct
% SHOULD be neg before and pos after
if negAf > negB4 | posB4 > posAf
thisTroughLabel = 2; % label trough as invalid
a = 'more diffs in wrong direction on either side of trough than correct'
end;
% check amount of difference on each side of the trough
if sum(diffWB4) > 0 | sum(diffWAf) < 0
thisTroughLabel = 2; % label trough as invalid
a = 'too much in wrong direction around trough'
end;
troughLabels = [troughLabels, thisTroughLabel]; % add label to end of list
end;
% add in labels for the first and last troughs, if needed
if start ~= 1
counter = 1;
while counter < start
troughLabels = [1, troughLabels]; % assign first trough as indeterminant
counter = counter + 1;
end;
end;
if stop ~= numTroughs
counter = 0;
while (numTroughs - stop) > counter
troughLabels = [troughLabels, 1]; % assign last trough as indeterminant
counter = counter + 1;
end;
end;
plot(Qd, 'm'); hold on;
whitebg([.9 .9 .9]); % set background color to gray
n = max(size(P)); % n has number of peaks found
for i = 1:n
if peakLabels(i) == 1
plot(P(i), Qd(P(i)), 'xb', 'MarkerSize', 10);
elseif peakLabels(i) == 2
plot(P(i), Qd(P(i)), 'xr', 'MarkerSize', 10);
end;
text(P(i), Qd(P(i)) + th*.5, ['p', int2str(i)], 'FontSize', 8);
end;
n = max(size(T)); % number of troughs
for i = 1:n
if troughLabels(i) == 1
plot(T(i), Qd(T(i)), 'xb', 'MarkerSize', 10);
elseif troughLabels(i) == 2
plot(T(i), Qd(T(i)), 'xr', 'MarkerSize', 10);
end;
text(T(i), Qd(T(i)) - th*.5, ['t', int2str(i)], 'FontSize', 8);
end;
hold off;