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The list is populated with models but the models cannot be shown.

Might be related to a recent change for classification problems (#3102).

Steps to reproduce:

1. New Random Forest Classification
2. Run
3. Check Results -> Random forest classification solution -> RF Model Evaluation

It is not necessarily the case that training or test partitions are consecutive and some visualizations as the line chart view are already prepared to handle such cases of training and test indices.

If one uses different training and test splits (e.g. alternating) the line chart insert empty points to bridge the gap between the training parts. However, these empty points are shown for the training series, but not for the other (test, all) series.

Since the underlying storage is an array, the TriangularMatrix<T> class should inherit from ValueTypeArray<T> instead of ValueTypeMatrix<T>. This would lead to a more efficient implementation.

Optional enhancements:

• option to specify storage order (row- or column major)
• a property to access the underlying T[] array