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迴圈版本:
function y = myconv(x1, x2)
y=zeros(1,1499);
for n=2:1:501
for k=1:1:n-1
y(n)=y(n)+g(k)*h(n-k);
end
end
for n=502:1:1000
k=n-500;
count=0;
while count<500
y(n)=y(n)+g(k)*h(n-k);
k=k+1;
count=count+1;
end
end
for n=1001:1:1499
k=n-500;
while k<=999
y(n)=y(n)+g(k)*h(n-k);
k=k+1;
end
end
向量化版本:(內層迴圈向量化)
function y = myconv(x1, x2)
y=zeros(1,1499);
for n=2:1499
if(n<502)
k=1:n-1;
y(n)=sum(x1(k).*x2(n-k));
elseif(n<1001)
k=n-500:n-1;
y(n)=sum(x1(k).*x2(n-k));
else
k=n-500:999;
y(n)=sum(x1(k).*x2(n-k));
end
end
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