So I am doing this assignment in where I have to Integrate the area under a certain peak after I derived the PSD. I finished all that but I cannot find anything to integrate the area of peak I want to can you guys please help me out?
MATLAB: I need help with integrating a specific area under a peak, to get a value for the thermal noise to derive a spring constant?
MATLABpsdspring constant
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One approach:
The Code —
D = load('signals (1).mat');Signal = D.Signal; % Get ‘Signal’
N = length(Signal);t = linspace(0, 1, N) * N; % Create Time Vector
[pk,loc] = findpeaks(Signal, 'MinPeakHeight',1); % Determine Indices Of Various Components
[trofs,trlocs] = findpeaks(-Signal);ltidx = find(trlocs < loc, 1, 'last');gtidx = find(trlocs > loc, 1, 'first');Out{1} = {Signal(1:trlocs(ltidx)); Signal(trlocs(ltidx)+1:trlocs(gtidx)-1); Signal(trlocs(gtidx):end)}; % ‘Signal’ Cell Array
Out{2} = {t(1:trlocs(ltidx)); t(trlocs(ltidx)+1:trlocs(gtidx)-1); t(trlocs(gtidx):N)}; % ‘t’ Cell Array
figureplot(Out{2}{1}, Out{1}{1}, 'r')hold onplot(Out{2}{2}, Out{1}{2}, 'g')plot(Out{2}{3}, Out{1}{3}, 'b')hold offgridThe Plot —
trapz(x,y)
Best Answer