Findpeaks from the excel data graph
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Harsimranjot Grewal
on 27 May 2021
Answered: Star Strider
on 27 May 2021
Hello Everyone,
I am trying to find the peak from the certain range on my x axis but its not working and giving me the error "Arrayindisices must be positive intergers or logical values".I am atatching the code and excel file as follow.Any help would be appreciated. Thanks in advance.
clc
Data = xlsread('test.xlsx');
%% Step 2 data
x2 =Data(655:8466,6); % Sample temprature
y2 =Data(655:8466,3); % Umsubstracted temprature
figure
plot(x2,y2);
set(gca,'ydir', 'reverse')
title('Step 2 Data')
hold on
%% Peak for step 2
J = x2(x2>90 & x2<120);
[pks, locs] = findpeaks((x2(J)),'Npeaks',1)
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Accepted Answer
Star Strider
on 27 May 2021
To create a logical vector for ‘J’, just do:
J = (x2>90 & x2<120);
Then the reference to it works correctly.
However there are no peaks in that region (at least that findpeaks identifies as peaks).
% C1 = readcell('https://www.mathworks.com/matlabcentral/answers/uploaded_files/632270/test123.xlsx');
T1 = readtable('https://www.mathworks.com/matlabcentral/answers/uploaded_files/632270/test123.xlsx','VariableNamingRule','preserve')
x2 = T1{655:8466,6}; % Sample temprature
y2 = T1{655:8466,3}; % Umsubstracted temprature
figure
plot(x2,y2);
set(gca,'ydir', 'reverse')
title('Step 2 Data')
hold on
%% Peak for step 2
J = (x2>90 & x2<120);
[pks, locs] = findpeaks((x2(J))),'Npeaks',1)
.
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