construct | A rust macro for building container literals | Reflection library

I have a dataset with the name of Danish ministers and their position from 1990 to 2020 (data comes from dataset called WhoGovern; https://politicscentre.nuffield.ox.ac.uk/whogov-dataset/). The dataset consists of the ministers name, the ministers position, the prestige of that position, and the year in which the minister had that given position.

My problem is that some ministers are counted twice in the same year (i.e., the rows aren't unique in terms of name and year). See the example in the picture below, where "Bertel Haarder" was both Minister of Health and Minister of Interior Affairs in 2010 and 2021.

I want to create a dataset, where all the rows are unique combinations of name and year. However, I do not want to remove any information from the dataset. Instead, I want to use the information in the prestige column to combine the duplicated rows into one. The observations with the highest prestige should be the main observations, where the other information should be added in a new column, e.g., position2 and prestige2. In the example with Bertel Haarder the data should look like this:

(PS: Sorry for bad presenting of the tables, but didn't know how to create a nice looking table...)

Here's the dataset for creating a reproducible example with observations from 2010-2020:

I am trying to use my own train step in with Keras by creating a class that inherits from Model. It seems that the training works correctly but the evaluate function always returns 0 on the loss even if I send to it the train data, which have a big loss value during the training. I can't share my code but was able to reproduce using the example form the Keras api in https://keras.io/guides/customizing_what_happens_in_fit/ I changed the Dense layer to have 2 units instead of one, and made its activation to sigmoid.

The code:

I need a trait that allows me to construct a object that borrows an object that borrows something. In the following example that is PaperBin. https://play.rust-lang.org/?version=stable&mode=debug&edition=2018&gist=78fb3f88b71bc226614912001ceca65b

I'm using BufferGeometry to handle meshes with lots of vertices, faces and normals, which I supply via TypedArrays. During rendering, the Scene and its Mesh is constructed without any warnings or errors in the console. With BoxHelper I've constructed a Bounding Box around the mesh.

Now the strangest thing happens: Although the Bounding Box is perfectly correct, the faces/vertices are cut off somewhere in the middle.

To see what I mean, here is the comparison of two models rendered with a python script (left) and rendered with Three.js (right):

The code I've used for this task can be found here in this pastebin. Any help is highly appreciated.

I have a pair of iterator, and I would like to use ranges::views::filter(some_predicate) on it (with the pipe operator). AFAIU I should first convert my pair of iterator into a view. I tried to use ranges::subrange(first, last) to do so, but I’m getting horrible error messages.

Note1: I’m using C++14 and range-v3 version 0.9.1 (the last version compatible with gcc-5.5). If the solution differs when using C++17/20 and/or when using C++20 std::ranges, I’m also interested to know what changed.

Note2: I find the documentation of range-v3 severely lacking, so I’m using cppreference.com. If you know a better documentation, I’m very interested.

EDIT:

In my real code, I’m wrapping a java-style legacy iterator (that has a next() method instead of operator++/operator*. I’m wrapping them in a C++-compatible wrapper. Then I tried to convert that wrapper into a view, and finally filter it. I reproduce a minimal example on godbolt. This use iterator_range as suggested, but it still doesn’t compile (see the second edit below).

I have an application under construction using the Navigation Drawer Activity which is the one with the left menu like the old version of Google PlayStore:

As you know the design comes bundled with a FAB (FloatingActionButton):

Now, in the left side menu you see these three Fragments:

I wanted to know, how do I assign different actions to the FAB when I change the Fragment? From the MainActivity I see that there is the k but I do not understand how to assign a different functionality to it, since when changing the Fragment, the same FAB is still there and executes the same action that in this case is a Toast:

I've created a form in which one of the questions consists of a checkbox and a textarea. I removed the standard view of checkboxes and made my own on their place. I now want to integrate the trigger of the checkbox click makes the textbox active.

I'm using jQuery and I don't know pure JS well. Unfortunately I don't have opportunity to change the HTML in my case.

Given a Spark dataframe with the following columns I am trying to construct an incremental/running count for each id based on when the contents of the event column evaluate to True.

This is my current program: