Summing partial dataset with expressions

[pturmel]

You can find it on the Module Showcase, on my own website, and here on the forum:

Automation Professionals' Integration Toolkit Module

Automation Professionals is pleased to announce the immediately availability of a major upgrade to its free Simulation Aids Integration Toolkit module. The new feature justifying the "major upgrade" language is the implementation of eleven new expression functions which use iteration to accomplish complex transforms of datasets and lists, to or from other datasets and lists, applying filtering, ordering, and computed new columns along the way. While there are certain operations that are still …

That last has the most explanations and examples.