How can I plot first harmonic wave from a wave data (Excel)

How can I plot first harmonic wave from a wave data (Excel)?

I have the following plot from an excel file data (attached).

I need only a wave plot of 1st harmonic of the main wave (shown above).

Thank you

Answer 1

[Yash Srivastava]

Hi Hesham,

In my understanding you need to plot data in 'waves.csv' in MATLAB.

For this you can use 'readtable' function to read data in MATLAB and plot the data using 'plot' function.

data=readtable('wave.csv');
plot(data, "Var1", "Var2")

Since no header is provided in .csv file, MATLAB assigns defaultvariable names, "Var1" and "Var2", to the column.

Please refer to the following documentation for more info on 'readtable'.

https://www.mathworks.com/help/matlab/ref/readtable.html

Thanks

[Hesham]

Thank you Yash.

I know how to read data from Excel.

I want to extract the 1st harmonic waveform and plot it from the wave main wave (excel data).

Answer 2

[Vishwa]

Hi Hesham,

MATLAB provides Curve Fitting Toolbox™ which has a fit type with fourier series. For only fundamental component, you can restrict the number of terms in the dialogue box to just 1.

Following MATLAB documentation might be helpful.

Fit Fourier Models - MATLAB & Simulink (mathworks.com)

openExample('curvefit/FitFourierModelsInteractivelyInCurveFitterAppExample')

Thanks.