How to smooth the data using the MATLAB?

Hi

I was trying to smaooth the data using smooth function but not able to manage. can some experties help me. the data is attached here.

Thank you in advance!

Answer 1

[KSSV]

T = readtable('https://in.mathworks.com/matlabcentral/answers/uploaded_files/1026350/data.txt');
x = T.Var2 ;
y = T.Var1 ;
yy = smooth(x,y,20) ;
plot(x,y,'r',x,yy,'b')

[Somnath Kale]

Thank You for your swift response

Answer 2

[Image Analyst]

Here are some options. Median filter medfilt1 and Savitzky Golay filter sgolayfilt. Adjust window widths as desired.

data = readmatrix('data1.txt')
x = data(:, 2);
y = data(:, 1);
plot(x, y, 'b-', 'LineWidth', 2);
grid on;
xlabel('x', 'FontSize', 20);
ylabel('y', 'FontSize', 20);
% Smooth the data
smoothedMedian = medfilt1(y, 79);
hold on;
plot(x, smoothedMedian, 'g-', 'LineWidth', 4);
smoothedSG = sgolayfilt(y, 2, 201);
hold on;
plot(x, smoothedSG, 'r-', 'LineWidth', 3);
legend('Original', 'Median', 'Savitzky-Golay')

[Somnath Kale]

@Image Analyst Thank You for you little advance smoothing functions information! I will look to that as well.