I am trying to filter noise present in the signal so that it gives me a smooth curve.But the signal is not getting filtered.Any help?

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preeti visweswaran
preeti visweswaran 2017-4-20
评论： preeti visweswaran 2017-4-20
Following is the code to filter out noise.Kindly let me know why i dont see the filtered signal.I want to get output like the one attached.Attached is the input file.I am working on the last column.
file = 'forRef_2.xls';
col = xlsread(file,'J:J');x_mags=abs(fft(col));
%num_bins=length(x_mags);
[b a]=butter(2,0.3,'low');
x_filtered=filter(b,a,col);
figure;
plot(col)
hold on
plot(x_filtered,'r')

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