On Saturday, 27 June 2015 at 10:37:08 UTC, Rikki Cattermole wrote:
No idea about the maths behind it are but:
Thanks a lot for your answer anyway. I am hoping even not related
with D directly, this discussions may atract people from other
languages to D while looking for Domain information.
chain(autoCorrResult[1..$/2])
Should that one be a zero?
I found this link below.
"http://www.aip.de/groups/soe/local/numres/bookcpdf/c13-2.pdf";
Which says :
The correlation at zero lag is in r0, the first component; the
correlation at lag 1 is in r1, the second component; the
correlation at lag −1 is in rN−1, the last component; etc.
Correlation result after IFFT is like :
0 1 2 3 ..... T -1 -2 -3 .... -T
How I wanted to be :
-T -T+1 ..... -1 0 1 .... T-1 T
After reading the link I think you are right,
auto finalResult = chain(autoCorrResult[$/2..$]).
chain(autoCorrResult[0..$/2]).
map!(a => a.re);
Example above should be the way how I transform. Also now I see
inverseFft().
dropBack(residual); ==> DropBack may not be a good idea here.
I will think about it
