How can i reduce the time that take my code to run?

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juan llano
juan llano 2018-10-6
回答： Luna 2018-10-6
Hello, i've been doin this code for a class, but is takes arround 180 seconds to run, i want to know if there is any way to optimize it, i think the "for loop" is taking so many time.
Ts=1/44100;
Fs=1/Ts;
t=0:Ts:3-(Ts);
y=sin(2*pi*440*t); % 440=La.
%sound(y,Fs);
%pause(3)
ynoise=y+(0.1).*randn(size(y));
%sound(ynoise,Fs);
ynoise(randi(length(y),1,ceil(0.01*length(y))))=randi(3)-2; q
%pause(3)
yx=ynoise;
N=10;
w=cat(2,zeros(1,(N-1)),yx);
un=cat(2,ones(1,N),zeros(1,length(y)-1));
h=zeros(1,(length(y)));
for i=1:length(y)
h(i)=sum(w.*un)/N;
un=circshift(un,1);
end
figure(1)
subplot(2,2,1),plot(t(1:300),y(1:300)),title("La")
subplot(2,1,2),plot(t(1:300),h(1:300)),title("new")
subplot(2,2,2),plot(t(1:300),ynoise(1:300)),title("La + noise")

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回答（1 个）

Luna
Luna 2018-10-6
try parallel for loop instead of your for loop. It took 109 secs in my machine.
parfor i=1:length(y)
newun=circshift(un,1);
h(i)=sum(w.*newun)/N;
end

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