COMMON: Fix flat idx (signed flip)

f3sch · shahor02 · commit 933c8d01e667 · 2025-01-29T15:06:14.000+01:00
Signed-off-by: Felix Schlepper &lt;felix.schlepper@cern.ch&gt;
diff --git a/Common/MathUtils/include/MathUtils/LegendrePols.h b/Common/MathUtils/include/MathUtils/LegendrePols.h
@@ -200,7 +200,7 @@ class Legendre2DPolynominal final : public TNamed,
            boost::math::legendre_p(i - j, y);
   }
 
-  inline int getFlatIdx(int i, int j) const { return i * (i - 1) / 2 + j; }
+  inline int getFlatIdx(int i, int j) const { return i * (i + 1) / 2 + j; }
 
   unsigned int fOrder{0};
   std::vector<double> fParams;

Original file line number	Diff line number	Diff line change
`@@ -200,7 +200,7 @@ class Legendre2DPolynominal final : public TNamed,`
`200`	`200`	`boost::math::legendre_p(i - j, y);`
`201`	`201`	`}`
`202`	`202`
`203`		`- inline int getFlatIdx(int i, int j) const { return i * (i - 1) / 2 + j; }`
	`203`	`+ inline int getFlatIdx(int i, int j) const { return i * (i + 1) / 2 + j; }`
`204`	`204`
`205`	`205`	`unsigned int fOrder{0};`
`206`	`206`	`std::vector<double> fParams;`