[visad] Modification to FFT.java

[Ben Webster]

Hello,

I found the VisAD project via a code excerpt for your FFT algorithm. I've
been looking at VisAD itself, and it looks very interesting, but in the
short term I just wanted to use your FFT algorithm. I've removed the VisAD
dependencies from the FFT code, just leaving the FT2D and FT1D methods, etc.
I just wanted to check whether it is acceptable (under the LGPL) to package
this as a (very small) library to use from my commercial code. I've attached
the modified code - really all I needed to do was remove the first few
methods and change the VisAD exceptions to IllegalArgumentExceptions.

Best Regards,
Ben.

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