Savitzky-Golay polynomial order returning NaN above 110

 Hi, I am a chemist and looking to do some smoothing on my data, but don't want it to be drastic, therefore I was trying to use the y=sgolayfilt(x,order,framelen) in  MATLAB and input a polynomial order of over 500 for example, but each time I try to use an order above 110 the function returns 'NaN' for my whole matrix.

 

Is this because the filter cannot support polynomials over 110? Or is there a way around this that will allow me to use higher order polynomials? I am sure I had previosuly been able to use polynomials above 110.

ANSWER

Matlabsolutions.com provide latest MatLab Homework Help,MatLab Assignment Help for students, engineers and researchers in Multiple Branches like ECE, EEE, CSE, Mechanical, Civil with 100% output.Matlab Code for B.E, B.Tech,M.E,M.Tech, Ph.D. Scholars with 100% privacy guaranteed. Get MATLAB projects with source code for your learning and research.

I suspect you are confusing the order and the window length of the filter

 

You should try first with low order filters (1 to 3 say) and then vary window length

 

an order above 100 seems to me way out the useful range

 

For what it is worth , below a code with different smoothing techniques

 

 

Fs = 1000;
samples = 1000;
dt = 1/Fs;
t = (0:samples-1)*dt;
y = square(2*pi*3*t) + 0.1*randn(size(t));

% %%%%%%%%%%%%%%%%
figure(1)
N = 10;
ys = slidingavg(y, N);
plot(t,y,t,ys);legend('Raw','Smoothed');
title(['Data samples at Fs = ' num2str(round(Fs)) ' Hz / Smoothed with slidingavg' ]);

% %%%%%%%%%%%%%%%%
figure(2)
N = 10;
ys = medfilt1(y, N,'truncate');
plot(t,y,t,ys);legend('Raw','Smoothed');
title(['Data samples at Fs = ' num2str(round(Fs)) ' Hz / Smoothed with medfilt1' ]);
grid on

%%%%%%%%%%%%%%%%
figure(3)
N = 10;
ys = sgolayfilt(y,3,51);
plot(t,y,t,ys);legend('Raw','Smoothed');
title(['Data samples at Fs = ' num2str(round(Fs)) ' Hz / Smoothed with sgolayfilt' ]);
grid on

%%%%%%%%%%%%%%%%
NN = 4;
Wn = 0.1;
[B,A] = butter(NN,Wn);

SEE COMPLETE ANSWER CLICK THE LINK

https://www.matlabsolutions.com/resources/savitzky-golay-polynomial-order-returning-nan-above-110.php