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How can I fix this error?

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Ghazal Hnr
Ghazal Hnr 2017-3-12
关闭： MATLAB Answer Bot 2021-8-20
Hello, I wrote this code:
figure(3)
dt = 0.001;
T = 60;
t = [0:dt:T] ;
omega0 = 2 * pi / T;
for k = 1:20
ck = cos (k * omega0 * t); % cosine component
a(k) = 2/T * ( sum (ECG_ac.*ck) * dt);
sk = sin (k * omega0 * t); % sine component
b(k) = 2/T * ( sum (ECG_ac.*sk) * dt);
end
magnitude = sqrt(a.^2 + b.^2);
plot(magnitude)
but i have this error:
Error using .*
Matrix dimensions must agree.
Error in Q2ECG (line 40)
a(k) = 2/T * ( sum (ck.*ECG_ac) * dt);
what's wrong?
Thanks for your help

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回答（2 个）

Roger Stafford
Roger Stafford 2017-3-12
Judging by your error message, the two arrays, ck and ECG_ac, have different sizes. That's a no-no.
  4 个评论
显示 2更早的评论
Roger Stafford
Roger Stafford 2017-3-13
Just change dt:
dt = linspace(0,T,15000);
Ghazal Hnr
Ghazal Hnr 2017-3-13
I have the same error again!
Walter Roberson
Walter Roberson 2017-3-13
T = 60;
t = linspace(0,T,length(ECG_ac));
dt = t(2)-t(1);
omega0 = 2 * pi / T;
for k = 1:20
ck = cos (k * omega0 * t); % cosine component
a(k) = 2/T * ( sum (ECG_ac.*ck) * dt);
sk = sin (k * omega0 * t); % sine component
b(k) = 2/T * ( sum (ECG_ac.*sk) * dt);
end
magnitude = sqrt(a.^2 + b.^2);
plot(magnitude)

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