For loop not working. Array indices must be positive integers or logical values.

Question

matlabgod 2018-12-10

0
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https://ww2.mathworks.cn/matlabcentral/answers/435044-for-loop-not-working-array-indices-must-be-positive-integers-or-logical-values

重新打开： Walter Roberson 2018-12-20

Im Trying to implement an FIR difference equation where the output y is the average sum of a set number of values(M) of the input(x).

f0=10;
fs= 2*50*f0;
ts=1/fs;
tw=2;
t=0:ts:tw;
x=1*square(2*pi*f0*t);
y = zeros(1,length(x));
k=6;
M=k;
for i=1:k
    for j = 1:M
     y(j) = y +(1/(M+1))*x(i-j);
    end 
end
figure, plot(t,y, 'k')
ylim([-1 1])

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Answer 1

James Tursa 2018-12-10

1
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https://ww2.mathworks.cn/matlabcentral/answers/435044-for-loop-not-working-array-indices-must-be-positive-integers-or-logical-values#answer_351588

在 MATLAB Online 中打开

This line on the first iteration when i=1 and j=1:

y(j) = y +(1/(M+1))*x(i-j);

You are indexing x(0). Also, you are trying to assign a vector (y on the rhs) into an element y(j) which isn't going to work either. This needs to be fixed.