Hi,
I have a (newbie) question about how to go about solving the problem below with commonsmath.
1) I have histogram data (equal x intervals) based off some distribution.
2) I need a way to calculate the second differential between two given x points in the distribution.
Here is what I think I should do:
1) Feed the (x,y) values represented by the top of each histogram entry within my xrange
into a UnivariateRealInterpolator between ranges (x1,y1) and (x2,y2).
2) The interpolate method gives me back a PolynomialSplineFunction (call if psf).
3) I get the second differential UnivariateRealFunction (call it urf) by calling psf.getPolynomialSplineDerivative().derivative()
4) I compute the second derivative value as the difference of urf.value(x2)  urf.value(x1)
Does this sound like a reasonable/accurate approach? Any suggestions/gotchas or pointers to
better approaches?
Thanks very much,
Sujit

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