parse error at =... (need to get periodic function)

2014 11 23
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更新时间：2014 11 23
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function [Y] = CircularConvolution(X,H)
a=0:1:50;
n1=length(X);
n2=length(H);
N=max(n1,n2);
X[n+a*N] = X[n]; %makes it periodic
H[n+a*N] = X[n]; %makes it periodic
Y=zeros(1,N);
N
for k=0:N-1
for q=0:N-1
F=mod((k-q),N);
Y(k+1)=Y(k+1)+X(q+1)*H(F+1);
end
end
end
I need to make it so it calculates the convolution of a period sequence of numbers that are user entered.
In order to make a sequence periodic, i tried to say X[n+a*N]=X[n] and H[n+a*N]=H[n] . However this comes up with a parsing error at the = sign. Matlab does not seem to like the brackets, however I dont know how else to make this periodic. Any Ideas?

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Image Analyst
Image Analyst 2014-11-23

0 个投票

In that context you need to use round parentheses, not square brackets.

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Ronald McDonald
Ronald McDonald 2014-11-23
That worked, however it says that n is an undefined variable.
Image Analyst
Image Analyst 2014-11-23
That's correct. What do you want n to be? You need to assign it. Since I solved the original question, could you mark the answer as accepted? I'll still help with your second question if you need it.
Ronald McDonald
Ronald McDonald 2014-11-23
function [Y] = myCONVCirc(X,H)
a=1:1:50;
n1=length(X);
n2=length(H);
N=max(n1,n2);
for n=1:1:N;
X(n+a*n1) = X(n); %makes it periodic
H(n+a*n2) = X(n); %makes it periodic
end
Y=zeros(1,N);
N
for k=0:N-1
for q=0:N-1
F=mod((k-q),N);
Y(k+1)=Y(k+1)+X(q+1)*H(F+1);
end
end
end
Changed it to this. It runs, does it work and make sense though? I dont have much experience with MatLab syntax. Thank You by the way.

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