Anyone have any tips to improve my code for findpeaks() so that I get only the first big peaks for each graph like those in transducers 10,13 and 1 but only one of them per graph? I want the first arrival time. Thanks.

%*************************************************************************

%%This fucntion will graph waveforms and their hilbert transform from one

%%waveform .csv file

%%must add labeling for first peak and this function needs an input

%**************************************************************************

function g = graphData(file)

newStr = extractBetween(file,"_","_"); %get transducer name

table = readtable(file); %read the data into a table

xr = table2array(table); %convert the table into an array(matrix)

x = xr(:,1);

y = xr(:,2);

[up] = envelope(y); %attain the hilbert envelope fo the amplitude

m = [up];

M = find(up == max(m)); %find the max amplitude of the hilbert transform envelope

[pks,locs] = findpeaks(m,1)% find the first peak of the hilbert envelope

loc1 = [locs];

g = plot( x,y, x, up,'-p','MarkerIndices',locs(2000),...

'MarkerFaceColor','blue',...

'MarkerSize',10 ); %plot time vs. amplitude vs. hilbert and mark max amplitude of hilbert

xlabel('Time (seconds)');

ylabel('Volts');

title("Peak in Hilbert Transform of Signal");

legend("Transducer" + " " + newStr);

end

Answer 1

[darova]

If you want first peak use locs(1)

If you want max peaks use max()

If you want a few maximum peaks use sort()

Did i understand you correctly?