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Fft spectral function

Pramudito__Ary
Beginner
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Hello everyone

I have a project to get the fundamental / eigen value of structure using recorded accelerometer sensor.

This sensor is generating acceleration vs times series (m/s^2 vs s) data real*8. It will need fft and multiplied by it conjugate to get it spectrum and to discover the peak dominant frequency. It should be like easy on matlab. https://www.mathworks.com/help/matlab/examples/fft-for-spectral-analysis.html. I would like to do it in fortran. But I don't know what subroutine that fit for fft and conjugate same as the matlab done. A lot of fft subroutine like fftpack, but I don't what to choose. 

 

 

 

 

 

 

 

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