Files
ResInsight/ApplicationLibCode/ReservoirDataModel/RigWeightedMeanCalc.h
Kristian Bendiksen 4d2a868079 #14766 Fix potentially uninitialised object used for accumulation
RigStatisticsCalculator::mobileVolumeWeightedMean() accumulated into a sum
from an out-parameter that callees were not required to write. Every
implementation of the per time step overload has early-return paths that
leave the value untouched, as does RigWeightedMeanCalc::weightedMeanOverCells,
so indeterminate stack memory could be summed and presented in the UI.

Return std::optional<double> from the computation layer instead of using an
out-parameter, making "value not available" explicit and impossible to ignore:

- RigWeightedMeanCalc::weightedMeanOverCells
- RigStatisticsCalculator::mobileVolumeWeightedMean and all overrides

Time steps without a computable mean no longer contribute to the accumulated
sum, and are excluded from the divisor. Previously they would either add
garbage or, with a naive zero initialisation, bias the average towards zero.

RigStatisticsDataCache keeps the existing HUGE_VAL marker on its public API
via value_or(), so behaviour seen by RigHistogramData and the overlay info
is unchanged apart from the fix.

Also:
- Set m_isVolumeWeightedMeanCalculated in the per time step cache, which was
  never assigned, so the cached value was recomputed on every call.
- Remove a duplicated ensureKnownResultLoaded() call in
  RigEclipseNativeVisibleCellsStatCalc.

Fixes #14766
2026-09-21 18:36:27 +02:00

40 lines
1.6 KiB
C++

/////////////////////////////////////////////////////////////////////////////////
//
// Copyright (C) 2017- Statoil ASA
//
// ResInsight is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// ResInsight is distributed in the hope that it will be useful, but WITHOUT ANY
// WARRANTY; without even the implied warranty of MERCHANTABILITY or
// FITNESS FOR A PARTICULAR PURPOSE.
//
// See the GNU General Public License at <http://www.gnu.org/licenses/gpl.html>
// for more details.
//
/////////////////////////////////////////////////////////////////////////////////
#pragma once
#include "cvfArray.h"
#include <optional>
#include <vector>
class RigActiveCellInfo;
class RigWeightedMeanCalc
{
public:
// Returns the weighted mean over the given cells, or an empty optional if the mean can not be computed,
// ie. when required input data is missing or the sum of weights is zero.
static std::optional<double> weightedMeanOverCells( const std::vector<double>* weights,
const std::vector<double>* values,
const cvf::UByteArray* cellVisibilities,
bool isUsingVisibleCells,
const RigActiveCellInfo* actCellInfo,
bool isUsingActiveIndex );
};