A simplified version of my dataset can be reproduced by the following:I am looking for a preferably dplyr solution to achieve the following.
I know how to create a Map<T, List<U>> , using Collectors.groupingBy:Map<Key, List<Item>> listMap = items.stream().collect(Collectors.groupingBy(s->s.key));
Suppose I have a group of bumper cars, which have a size, a color and an identifier ("car code") on their sides.
I have a problem grouping two values with Java 8.My main problem is about grouping two fields, I group correctly one field called getNameOfCountryOrRegion() but now I am interested in groupingBy another field that is called leagueDTO as well.
Similar to my previous question here, the User objects I have are theseNow I am trying to get the name to varying ages trend for these users. But I need to filter them above a threshold age. I could get the trend using
I have a very large (too big to open in Excel) biological dataset that looks something like this What I am looking to do is figure out how many of each species (A, B, or C) exist in each region (1, 2, or 3) in each of the three years...
I'm trying to add float values of a vector according to integer values from another vector. for instance if I have:
I need to aggregate overlapping segments into a single segment ranging all connected segments. Note that a simple foverlaps cannot detect connections between non overlapping but connected segments, see the example for clarification. If it would rain on my segments in my plot I am looking for the stretches of...
I have a List fooListI would like to group by category and then sum amount aswell as price.The result will be stored in a map: