honestly I have pdf plot which has x and y and by histogram2 I plot it. but now I want to calculate the area under it? how can I do it
MATLAB: I want to calculate the area under 3d curve? how can i do it
area under curvepdftrapz
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I am not certain what you want.
Try this:
D1 = load('EDA_pxx.mat');EDA_pxx = D1.EDA_pxx;D2 = load('w.mat');w = D2.w;ws(1,:) = [0, 0.045];ws(2,:) = [0.045, 0.15];ws(3,:) = [0.15, 0.25];for k = 1:size(ws,1) lv = w >= ws(k,1) & w <= ws(k,2); wv{k} = w(lv); pxxv{k} = EDA_pxx(lv); AUC{k} = trapz(wv{k}, pxxv{k});endpchc = 'rgb';figureplot(w, EDA_pxx)hold onfor k = 1:size(ws,1) patch([wv{k}; flipud(wv{k})], [pxxv{k}; zeros(size(pxxv{k}))], pchc(k))endhold offgridfprintf('Area %d = %.3E\n', [1:3; [AUC{:}]])producing:
Area 1 = 7.149E-05Area 2 = 8.660E-05Area 3 = 6.038E-05and:
.
I just found a MATLAB function area() which will do the job! B
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