"Index exceeds matrix dimensions" error in For Loop

2016 10 13
2 个回答
更新时间：2016 10 13
8 次查看（30 天）

0 个投票

I continue to get an "Index exceeds matrix dimensions" error when running the following for loop. It says there is an error in sym/subsref (line805), although my code only goes down ~200 lines, any help is much appreciated! Here is my code
%Code
T=8;
t = -T/7:0.001:T/7;
syms t
y = 7*t.^2/(2*T);
N = 50;
k = -N:N; % vector of "k" coefficients.
ak = zeros(size(k));
omega = 2*pi/T; % frequency
dt = t(2) - t(1); % time delta
for n = 1:length(k)
if k(n) == 0
ak(n) = a0;
else
ak(n) = (1/T)*sum(y.*exp(-1i*k(n)*omega*t)*dt); % Simulates the integral of the analysis equation
end
end
end

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回答（2 个）

James Tursa
James Tursa 2016-10-13

0 个投票

You've got these two lines that define t differently:
t = -T/7:0.001:T/7;
syms t
What is your actual intent for t? The first line? Maybe comment out the 2nd line?
Star Strider
Star Strider 2016-10-13

0 个投票

With two changes to your code, this runs:
syms t a0 % The ‘syms’ Statement Is First
T=8;
t = -T/7:0.001:T/7;
y = 7*t.^2/(2*T);
N = 50;
k = -N:N; % vector of "k" coefficients.
ak = sym(zeros(size(k))); % <— Create ‘sym’ Object
omega = 2*pi/T; % frequency
dt = t(2) - t(1); % time delta
for n = 1:length(k)
if k(n) == 0
ak(n) = a0;
else
ak(n) = (1/T)*sum(y.*exp(-1i*k(n)*omega*t)*dt); % Simulates the integral of the analysis equation
end
end

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