Findpeaks from the excel data graph

Question

Harsimranjot Grewal 2021-5-27

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/841415-findpeaks-from-the-excel-data-graph

回答： Star Strider 2021-5-27

test123.xlsx

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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Answer 1

Star Strider 2021-5-27

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/841415-findpeaks-from-the-excel-data-graph#answer_710670

在 MATLAB Online 中打开

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')

T1 = 24689×9 table

Var1 Time Unsubtracted Baseline Program Sample Approx. Heat Flow Uncorrected ____ ________ ____________ ________ _______ ______ _______ _________ ___________ NaN 0 -1.3255 0 50 50.062 0 1 -86.659 NaN 0.001667 -1.3257 0 50 50.062 0 1 -86.66 NaN 0.003333 -1.3258 0 50 50.062 0 1 -86.66 NaN 0.005 -1.326 0 50 50.062 0 1 -86.66 NaN 0.006667 -1.326 0 50 50.066 0 1 -86.66 NaN 0.008333 -1.3262 0 50 50.066 0 1 -86.66 NaN 0.01 -1.3265 0 50 50.062 0 1 -86.66 NaN 0.011667 -1.3266 0 50 50.062 0 1 -86.661 NaN 0.013333 -1.3265 0 50 50.062 0 1 -86.66 NaN 0.015 -1.3267 0 50 50.062 0 1 -86.661 NaN 0.016667 -1.3268 0 50 50.066 0 1 -86.661 NaN 0.018333 -1.3269 0 50 50.066 0 1 -86.661 NaN 0.02 -1.3272 0 50 50.066 0 1 -86.661 NaN 0.021667 -1.3274 0 50 50.062 0 1 -86.661 NaN 0.023333 -1.3275 0 50 50.066 0 1 -86.662 NaN 0.025 -1.3275 0 50 50.066 0 1 -86.662

x2 = T1{655:8466,6}; % Sample temprature

y2 = T1{655:8466,3}; % Umsubstracted temprature