Imaginary part arises when the data imported from excel sheet is double integrate

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Sathyamoorti 2013-10-4

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https://ww2.mathworks.cn/matlabcentral/answers/89143-imaginary-part-arises-when-the-data-imported-from-excel-sheet-is-double-integrate

关闭： MATLAB Answer Bot 2021-8-20

Hi I double integrated two columns of data in excel sheet but in the output the displaced data has imaginary part can some one help me to avoid the imaginary part. clear; clc; w = xlsread('Book3.xlsx'); dt=.02; t=[0:dt:20]; disp = discrt(w,dt); plot(t,disp,'r',t,w); xlabel('Time') ylabel('displacement') title('Integrated unfiltered plot') %legend ('X integrated displacement')