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matlab hanging for the below code

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Fs=10
t=0:1/Fs:1
x1=cos(2*pi*t*3)+cos(2*pi*t*4)+cos(2*pi*t*8)+cos(2*pi*t*10)
fft_x1=fft(x1)
fft_shift=fftshift(fft_x1)
mag=abs(fft_shift)
N=length(t)
f=-Fs/2:Fs/N:Fs/2-(Fs/N)
stem(f,mag)
fr=[]
for k=1:N
sum=0
for n=1:N
out=x1(n)*exp((-i*pi*2*n*k)/N)
sum=sum+out
end
fr=[fr sum]
end
fr=fftshift(fr)
mag1=abs(fr)
plot(t,x1)
title('signal time')
stem(f,mag1)
for this code matlab is hanging ,but for other programs matlab is working fine what is the problem in the code

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Accepted Answer

Image Analyst
Image Analyst on 3 Dec 2019
It doesn't hang for me.
But you should not use the name "sum" for your variable since it's the name of a very important built-in function that you will overwrite.

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Shashidhar Kudari
Shashidhar Kudari on 4 Dec 2019
thanks for the answer, it solved my problem
Shashidhar Kudari
Shashidhar Kudari on 4 Dec 2019
if we overwrite the inbuilt function ,then how should we correct that?
whether it gets corrected on restart of matlab?
Walter Roberson
Walter Roberson on 4 Dec 2019
You can clear followed by the name of the function.
Exception: if what you overwrote was clear itself, then
builtin('clear', 'clear')
If you ovewrote builtin and clear then you need the special behaviour
builtin clear clear
This will, as a special case, not invoke
builtin('clear', 'clear')
where builtin in the above line refers to whatever you overwrote builtin with.

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More Answers (1)

Raj
Raj on 3 Dec 2019
Doesn't seem to be hanging for me!
Capture.JPG
Where are you having problem? Have you tried running in Debug mode?

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Walter Roberson
Walter Roberson on 3 Dec 2019
It does not hang for me either.

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