Smooth a curve or increasing the resolution?

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Tay
Tay 2021-8-4
评论： Stephen23 2021-11-24
Hello !!
I read data from an instrument (ILX Lightwave TEC) that gives me current values and I plot against time, but my curve saturates at times. I think this might be a resolution problem.
I would like to smooth the curve.
I tried using the slidingavg function, but it doesn't seem right.
clear all
y = load('ILX_TEC_curr.txt');
x = load('ILX_TEC_time.txt');
N = 10;
ys = slidingavg(y, N);
hfig4=figure(4);
plot(x,y,x,ys,'-o');
xlabel('Time (s)','fontsize',18,'fontweight','bold');
ylabel('Sample TEC Current (A)','fontsize',18,'fontweight','bold');
Is there another form or function that can help me smooth the first result (first curve - blue line)?
Attached here are the data if that helps.
Thank you.
Tay

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回答（1 个）

Sulaymon Eshkabilov
You may consider using a moving average filter smoothdata() with sgolay, for instance.
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Sulaymon Eshkabilov
Sulaymon Eshkabilov 2021-8-4
Before making a final decision, play with the settings of these filters and also test movmean(). And compare them. The problem here is the quality of your acquired data. It looks like your data was not collected on a fixed smapling time.
Tay
Tay 2021-8-4
What do you mean by fixed sampling time?
I collect the current value each time using for loop.
Something like this
loop_end = 6000;
for i = 1:loop_end
ILX_TEC_time(i) = toc; %cpu elasped time
ILX_TEC_curr(i) = str2double(query(ILX_obj,'TEC:ITE?')); %read ILX TEC current
end
Then I plot current x time aquired.
Will have a look to the movmean() function also :D

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