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From: Dilan Sankalpa on 20 Jun 2010 13:23
I have some values in a matrix. When i plot them there is a noise along the curve. I need to do some calculation to the matrix and get a smooth curve. I prefer a code cab be implemented in a m file rather than a simulink model.
Can any one please help me regarding this problem???
From: Wayne King on 20 Jun 2010 16:27
"Dilan Sankalpa" <dilancs(a)yahoo.com> wrote in message <hvlipp$jgf$1(a)fred.mathworks.com>...
> I have some values in a matrix. When i plot them there is a noise along the curve. I need to do some calculation to the matrix and get a smooth curve. I prefer a code cab be implemented in a m file rather than a simulink model.
> Can any one please help me regarding this problem???

Hi Dilan, I think you need to be more specific. As a simple example, you can implement a moving average filter that will smooth the data.

x1 = cos(2*pi*(1/20)*(0:99)');
% signals before adding noise
x1 = repmat(x1,1,5);
% signals plus noise
x = x1+randn(100,5);
y = filter(0.1*ones(10,1),1,x);
% Compare the columns of x with the columns of y

This is just a low pass filter implemented on all the columns of the matrix. Of course there are many other types of low pass filters you can implement and other ways to smooth the data.

Wayne
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