Hello i'm new use matlab. i would like to use savitzky golay to smooth my data. I have the data in .txt format. Can you help me how to plot my data and use the savgol filteriing? Thank you

Savitzky Golay Filtering

Answer 1

[Ameer Hamza]

You can use sgolayfilt() function from Signal Processing Toolbox. For reading data from txt file you can use textscan(). For plotting you can use plot() function. For a more comprehensive example, please attach a sample dataset.

[Simon Giando]

This my data sample dataset. can you show me how it works? thank you

[Ameer Hamza]

Here is a sample code

f = fopen('R_02.txt');
data = textscan(f, '%f %f', 'HeaderLines', 1);
fclose(f);

x = data{1};
y = data{2};

y_filtered = sgolayfilt(y, 3, 11);

[Simon Giando]

thank you very much. how if i would like to export the y_filtered to excel?

[Ameer Hamza]

You can use xlswrite() to write the data from MATLAB to an excel file.

Answer 2

[Image Analyst]

See assorted attached sgolayfilt() demos.