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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Incorrect calculation method for \"∑(y)\" in `CurveStatsTool`","articleBody":"### Summary\n\nIn 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.\n\n### Problem Description\n\nThe `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.\n\n#### Incorrect Implementation (before fix)\n\n```python\n(\"∑(y)=%g\", lambda *args: spt.trapezoid(args[1], args[0])),\n```\n\n#### Correct Implementation (after fix)\n\n```python\n(\"∑(y)=%g\", lambda *args: np.sum(args[1])),\n```\n\n### Impact\n\nUsers 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.","author":{"url":"https://github.com/PierreRaybaut","@type":"Person","name":"PierreRaybaut"},"datePublished":"2025-06-16T13:30:12.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":0},"url":"https://github.com/44/PlotPy/issues/44"}