@CarlLange - I don't always understand Dataset syntax, but I think you want to put Accumulate in the first argument, instead of All

ds[Accumulate, "val2"]

(I forgot to turn my notebook magnification down to 50% before screenshots)

@CarlLange ds[All, i = 0; {"RateChange" -> (i += # &)}] keeps the dates but it does leave i hanging around; which I don't like

Sigh. TimeSeriesResample was very broken for me, until Mma decided to do a paclet update. I wonder how often this kind if things happen.

@kirma there should be a function to call a dataset with the current version installed, all Wolfram packet updates added on top of it, a all others that might exist, but still not installed...

I already started to write a bug report on it, but then restarted the kernel, and next evaluation did something that looked like a paclet update... and the problem was gone.

cosmos.esa.int/web/gaia/iow_20180425

I need some advice from Mathematica users who speak English natively.

Why is natural as a function name? TreeLikeComponents or TreelikeComponents?

For those who wonder what these "tree-like components" are, see below:

@JasonB. You can use Edit -> Copy As -> Bitmap on a retina machine to get a non-retina rasterization into the clipboard.

@Szabolcs I slightly prefer TreelikeComponents

@chuy Agreed, camel-case indicates to me that you have tree like components instead of treelike components. The second better conveys what you want, even if treelike isn't truly tree-like

It's English, so smushing words together like that is perfectly valid outside of very formal settings.

@kirma TimeSeriesResample leaks memory. I reported it but I haven't checked if it was solved in 11.3

@chuy @b3m2a1 Thanks! That's what I had named it, just wanted confirmation before release.

@JasonB. Ah, that's really helpful, thanks a lot! Unfortunately for me it's lost the Quantity, but that's still far nicer than what I had before!

@Edmund I suppose if you do it in a Module it won't leave i hanging around: ds[All, Module[{i = 0}, {"RateChange" -> (i += # &)}]] works correctly (although loses the Quantity for me. Thanks a lot though, that's really helpful!

@JasonB. that's funny, doing ecbRateChanges[Accumulate, {"RateChange"}] correctly keeps the Quantity. Weird.

@Szabolcs About your VertexComponent question. Have you tried what happens when you use DirectedEdge? This result looks suspicious as well:

g3 = Graph[edges /. Rule :> DirectedEdge, VertexLabels -> Automatic];
HighlightGraph[g3, Subgraph[g, VertexComponent[g3, {50}, 3]],
   GraphHighlightStyle -> "Thick"]

How do I come from 1 to 50 in 3 steps?