Incorrect calculation method for "∑(y)" in CurveStatsTool #44
Description
Summary
In the CurveStatsTool class, the summation of y-values "∑(y)" was incorrectly implemented using scipy.integrate.trapezoid instead of the appropriate numpy.sum function. This resulted in incorrect statistical values being displayed when using the curve statistics tool.
Problem Description
The CurveStatsTool provides various statistical calculations for curves, including sum of y-values, denoted as "∑(y)". However, the implementation was using the trapezoidal integration method (spt.trapezoid) which calculates the area under a curve. This is mathematically incorrect for a simple summation operation, which should simply add all y-values without any weighting or integration.
Incorrect Implementation (before fix)
("∑(y)=%g", lambda *args: spt.trapezoid(args[1], args[0])),Correct Implementation (after fix)
("∑(y)=%g", lambda *args: np.sum(args[1])),Impact
Users relying on the "∑(y)" calculation from the curve statistics tool were receiving incorrect values that represented an approximation of the integral rather than the actual sum of y-values.