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class ExponentialMovingAverageModel : public QSortFilterProxyModel
After QSortFilterProxyModel subclass that will calculate Exponential Moving Average from a source model that has four columns ( in order: Open, High, Low, Close ).
So getting the close value from the source model would look like:
double close = sourceModel()->index(mapToSource(index).row(), 0).data().toDouble();
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