Value of J in DFT

Hi,

I am going through a post for DFT code in matlab so that I can convert it to JAVA. while going through I found below link. http://www.mathworks.com/matlabcentral/answers/67283-need-fft-code-for-matlab-not-built-in

Might be this is done long back. But I see Sum=Sum+x(jj)*exp(-2*pi*j*(jj-1)*(k-1)/nfft);

In this after pi, there is "j" what is the value of J here and how can I determine that.

Thanks in advance for your support!!

Answer 1

[Geoff Hayes]

j (along with i) is the imaginary unit. In the Command Window, type

 >> j

 ans =

   0.0000 + 1.0000i

See http://www.mathworks.com/help/matlab/ref/i.html for details.

[NAGA DINESH KOTHALA]

Thank you very much!!