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# How to get the same FFT result in Mathematica?

Posted 10 years ago
 Hello all, I write because i have a doubt that is actually costing me resolve, my professor i shared a code in Matlab to understand something that he explained, the problem is that I do not know how to do this in Mathematica. Code in question is: From matlab fft2([1,1,2;3,5,8;13,21,24])  the output is ans = 78.0000 + 0.0000i -13.5000 + 6.0622i -13.5000 - 6.0622i -33.0000 + 36.3731i 6.0000 - 6.9282i 6.0000 - 3.4641i -33.0000 - 36.3731i 6.0000 + 3.4641i 6.0000 + 6.9282i  I write in mathermatica Fourier[{{1,1,2},{3,5,8},{13,21,24}}]  but the result is wrong, any idea de how to get the same answer. Thanks in advance
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Posted 10 years ago
 This reproduces the result in the OP's post. Fourier[{{1, 1, 2}, {3, 5, 8}, {13, 21, 24}}, FourierParameters -> {1, -1}] 
Posted 10 years ago
 Umm, did you check the Documentation Center on Fourier? Because really that's the first place to look when the software gives a surprising result.
Posted 10 years ago
 Hello Danny, I should have indicated that the code I pasted gives the result that he is seeing with the other software.
Posted 10 years ago
 W. Craig Carter thanks for your quick response and concise, was confused about the Fourier command but thanks your help'm learning more.Luis Ledesma.
Posted 10 years ago
 Daniel check the documentation of the command in question but as he had not understood well the concept,it seemed to me that was not in the documentation, but thank you for your suggestion i will into consideration for future questions.
Posted 10 years ago
 Luis, It is perfectly acceptable, and reasonable, and useful, to mention in a question that the documentation was checked (and perhaps not well understood, as was apparently the case here). Even better would be to indicate what specifically you had checked in the documentation. That way a respondent, such as Craig Carter in this case, might have a better idea of what is the misunderstanding, and perhaps how to explain the remedy.
Posted 10 years ago
 The really good stuff in the documentation is under "Details and Options".