# Curve smoothing of a voltage-time plot

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Chinmaya on 31 Mar 2023
Commented: Chinmaya on 31 Mar 2023
Hello,
I have a voltage-time plot as shown below, the voltage values are fluctauting and hence I am not able to use it in my end application.
Is there any tool available in matlab that I can use to smooth the curve.
I have attached the voltage-time values for reference.
Regards Pratheek on 31 Mar 2023
Hi Chinmaya,
MATLAB provides a built-in function called smoothdata() that can be used to generate smoother plots compared to those generated using raw data. By applying smoothing techniques to the data, smoothdata() can effectively reduce noise and highlight underlying trends in the data. Refer this link for more information Smooth noisy data - MATLAB smoothdata (mathworks.com)
Please find attached the code snippet that can be used to smooth the data in MATLAB.
% Load data from xlsx file
% Extract relevant data
x = data(:,1);
y = smoothdata(data(:,3));
% Plot data
plot(x,y);
Chinmaya on 31 Mar 2023
Hello pratheek,
Thanks for the answer, smoothdata reduces lot of fluctuations.The smoothened curve is as shown below Can we further smoothen the curve as shown in below reference. Regards

Raghunathraju on 31 Mar 2023
Hi Chinmaya,
You can smooth your curve using smooth function. You can refer the following example to use the smooth function
x=a(:,1);
y=a(:,3);
yy1 = smooth(x,0.1,'loess');
yy2 = smooth(y,0.1,'rloess');
subplot(2,1,1)
plot(a(:,1),a(:,3))
subplot(2,1,2)
plot(yy1,yy2) Chinmaya on 31 Mar 2023
Hello Raghunathraju,
Thanks for the answer, Is there a way by which we can further smoothen the cure, as shown in below reference. Regards

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