How to integrate two columns of data in MAT LAB

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Sathyamoorti
Sathyamoorti 2013-10-17
评论： Sathyamoorti 2013-10-18
I have two columns of data in excel and I want to double integrate it in MATLAB using Trapezoidal method. Can some one help me how to do it in MATLAB R2009b. Any help is highly appreciated.

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回答（1 个）

Wayne King
Wayne King 2013-10-17
Since you are on an older release, how about using dblquad() instead?
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Jan
Jan 2013-10-17
Please explain, what you have tried so far, e.g. if the import from Excel is working already, or if this is a part of the question. Please consider Where to add more details.
Sathyamoorti
Sathyamoorti 2013-10-18
This is the code which I have tried so far all going futile
function dispdata = wint(w,dt)
N1=length(w);
numbers = w(1:1001);
N = 2^nextpow2(N1);
if N > N1
w(N1+1:N) = 0;
end
df = 1 / (N*dt);
Nyq = 1 / (2*dt);
acc_freq_data = fftshift(fft(w));
disp_freq_data = zeros(size(acc_freq_data));
f = -Nyq:df:Nyq-df;
for i = 1 : N
if f(i) ~= 0
disp_freq_data(i) = acc_freq_data(i)/(2*pi*f(i)*sqrt(-1))^2;
else
disp_freq_data(i) = 0;
end
end
dispdata = ifft(ifftshift(disp_freq_data));
dispdata = dispdata(1:N1);
w = xlsread('rawdata1.xlsx'); dt=.02; t=[0:dt:20]; acc = trapz (w,N1); disp = wint(acc,dt); plot(t,disp,t,acc);

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