vtm | a vector-tile map library written in java - running | Map library

Since you only provided what the first item of SCLTN11 should look like, it is not easy to come up with a general pattern. However, based on the dimensions of vna.Data and the expected dimension of vm.SCLTN11, I guess I managed to understand what you want to achieve. If I'm not mistaken, you need the first item of SCLTN11 to consist of the S11R and S11I values of only FIRST items in A,B,...,I collections. For the second item, you want the S11R and S11I values of all the SECOND items in A,B,...,I collections. And so on. If this is what you want, you can't easily achieve it with foreach loops. However, you can easily use for loops with indexes to do it.

What I got to know from the above example is both the tables have the same number of rows and they need to be joined side-ways without any common join-key. To achieve this create a temporary column with a common join key and then apply a join. The join_key is generated using a row_number with ordering on a literal.

Generally, the onCreateView() requires to return a View instance. So, you can return your MapView instance itself. Hope it works.

instead highcharts seems to add to the value of the previous column for a category when drawing the stack, ending up with -5.3 + (-9.2) + (-12.0) + (-6.7) = -33.2

That's exactly how the stacking works, more information you can find here: https://www.highcharts.com/docs/advanced-chart-features/stacking-charts

instead of stacking all the smaller values inside -12.0.

If you want to achieve this you shouldn't use the stacking feature, but set columns position to overlaps each other.

Demo: https://jsfiddle.net/BlackLabel/e9w4r6h8/

Your build.gradle (Module:app) should look like this