How to get number of peaks and locs from different graphs that are plotted using a single for loop?

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Zara Khan
Zara Khan 2018-7-16
评论： Zara Khan 2018-7-16
figure;
for k=1:length(x)
profile(k)=img(y(k),x(k));
plot(profile,'r-','LineWidth',2);
grid on;
ylim([0 2]);
end
This code giving me different plots. For each of the plot I am getting different peaks. How can individually calculate no of peaks and locs for each of the plot?

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回答（1 个）

KSSV
KSSV 2018-7-16
Have a look on functions max and findpeaks.
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KSSV
KSSV 2018-7-16
iwant = cell(length(x)) ;
figure;
for k=1:length(x)
profile = img(y(k),x(k));
[pks,locs] = findpeaks(profile) ;
iwant{i} = pks ;
plot(profile,'r-','LineWidth',2);
grid on;
ylim([0 2]);
end
Zara Khan
Zara Khan 2018-7-16
Error using findpeaks Expected Y to be one of these types:
double, single, uint8, uint16, uint32, uint64, int8, int16, int32, int64
Instead its type was logical.
Error in findpeaks>parse_inputs (line 189) validateattributes(Yin,{'numeric'},{'nonempty','real','vector'},...
Error in findpeaks (line 131) [y,yIsRow,x,xIsRow,minH,minP,minW,maxW,minD,minT,maxN,sortDir,annotate,refW] ...
Error in ci_1 (line 33) [pks,locs] = findpeaks(profile);
This is the error I am getting . converting profile to double before using findpeaks still getting the same error

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