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eser

Germany
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Posted - 06/07/2005 :  09:02:57 AM  Show Profile  Edit Topic  Reply with Quote  View user's IP address  Delete Topic
Origin Version (Select Help-->About Origin): 7
Operating System: Windows XP

Hi All!

I have some discrete data points that I wanna make a FFT analysis inorder to get a Fourier Transformation function. I did the analysis and I have the result in the table as Freq(x), Real(y), Imag(y), r(y), Phi(Y) and Power(y). The point is do I have an equation of funtion after the FFT analysis to a discrete data points. If I have a function after the analysis how can I see that?

Thanks in advance...

Eser

Mike Buess

USA
3037 Posts
Posted - 06/07/2005 :  10:30:15 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Hi Eser,

It's not clear to me what you mean by "function after analysis". Origin uses the standard FFT expression to generate discrete spectrum points from another set of discrete data. If you want to see that expression look up FFT in the index of the Origin guide. (Help > Origin)

Mike Buess
Origin WebRing Member
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eser

Germany
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Posted - 06/07/2005 :  4:41:50 PM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply

Hi Again!

I am not sure about something in Fourier Transformation, I think you can write any periodic function interms of adition of some other functions. If we have in the begining not a function but some discrete points to make the Fourier Transformation like in my case then we have a Discrete Fourier Transformation. So as a result of discrete fourier transformation do we have a equaiton of function or we have another set of data points in frequency domain?

Eser
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Mike Buess

USA
3037 Posts
Posted - 06/07/2005 :  5:01:10 PM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
The discrete FT produces a set of data points. In fact, all of the operations that can be done in Origin yield discrete datasets rather than analytical equations. (That's the nature of a computer.) However, you can fit a dataset to a suitable equation using the Advanced Fitting Tool. You might find it useful to read through the Analysis: Curve Fitting section of the Origin Reference.

Mike Buess
Origin WebRing Member
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