forum.alglib.net

I try to do resampling of unshort array from size 256 to 512.
For some reason output y2 have in some positions negative values.
I went thru data in the original array but didn't find any strange values. Interest is that this happens on position 255 and 256 in the
resamples array (end positions of the original array).
I use function
alglib.spline1dconvcubic(x, y, real_anmount, 0, 0, 0, 0, x2, new_amount, out y2);
any ideas how I can resolve this?