How come findpeaks() is giving me the error: Error in findpeaks (line 136) = parse_inpu​ts(isInMAT​LAB,Yin,va​rargin{:})​; I want to get the first peak of an envelope I made...

%%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,lo] = envelope(y); %attain the hilbert envelope fo the amplitude

Y = [up,lo];

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

[pks,locs] = findpeaks(Y);

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

'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

[Timothy Nsubuga]

line 136 is a line in Findpeaks.m that I don't understand.

[Steven Lord]

Show us the full text of the error message you received. That means all the text displayed in red. Knowing what error findpeaks threw should help us understand why findpeaks threw that error.

[Timothy Nsubuga]

I solved it thanks! I needed to output only the up envelope and pass that on to findpeaks().