Hi Dick, Dick Moore wrote:
Hi Magnus -- Any possibility that there is some math package subroutine error of some kind? In yours or theirs?
Well, wherever the error is, for a known series of 1000 frequency samples (or equalent 1001 time samples) I expect the error to be algorithmic rather than math-support. Programming in crisp C gives me the floating-point processor and only the sqrt may be affected and numbers sits nicely there, no great cancelation in the big sums (they sum up squared values) so no, it is not very likely.
The modified total deviation involves taking 3*m samples out of the sequence, calculate the frequency of those samples, compensate the samples, mirror them up and down in non-inverting even mirroring to 9*m samples, preform the tripple-diff of the second derivate and average over m samples. A couple of sums, averaging and scaling terms. There are many small details that could go wrong. For instance, I can't understand how the Hadamard Total Deviation for m=1 is equal to the Hadamard Deviation for m=1. The inner sums comes out differently for back-of-printout pen-and-paper analysis. Something is fishy here. Either I am quite stupid or...
Cheers, Magnus _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
