four1() code understanding


Lianqing
03-23-2006, 10:12 AM
Hi,

I can't understand the code segment below in four1()

data[j-1] = data[i-1]-tempr;
data[j] = data[i]-tempi;
data[i-1] += tempr;
data[i] += tempi;

Is there any fomulas that are relevant to this four lines?
Any help will be appreciated, thanks!

Lianqing