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I am learning a numerical method that involves Fourier transform.

As far as I know, I think Fourier transform is tool to find the frequency spectrum of a signal.

And the usual form shall be

"Integrate from negtive infinity to positive infinity, f(x)*exp(i*w*x)dx"

However, when i search this in wikipedia, it is defined with (w-wo), where wo is the central frequency.

http://en.wikipedia.org/wiki/Split-step_method

I don't really know what this definition is doing and what changes it would bring.

Why is it necessary to do so?

Please help.

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# Fourier analysis

Can you offer guidance or do you also need help?

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