Detour | A simple project to demonstrate function | Cybersecurity library

I'm having a hard time approaching any binary tree questions and most of them are recursive, so I decided to detour and start from the basics again. This is basically the pre-order traversal list. I've identified two ways that can give me the correct results if there is at least 1 node, but I'm unsure about the intrinsic differences between the two. As you can see, one returns the list when encounter null, the other returns null when encounter null:

Given a domain class with a parameterless constructor, how do we get a reference to that constructor through the Reflection API?

Consider for example a Student data class, such as:

I'm struggling to update a reactive variable, that is created with eventReactive(), in an observeEvent() with new data.

The background is following: I have a data.frame df with some variables (x and y) and number of observations depending on the selected city (created randomly for this example). x and y are initialized with zeros. Because I need to further process df, I pass df to city_df in an eventReactive().

So far, so good. Next, I want to add new data to city_df. The computation of this new data is dependent on the "compute" actionButton (input$compute), wherefore I update city_df in an observeEvent(). I manage to read the data stored in city_df, but I am struggling to overwrite its content. Actually, I am a bit unsure if this is possible at all, but I hope that some of you could give me a hint on how to update the reactive variable city_df with the new data in this observeEvent() and have its output evaluated in the app(?).

I got a data frame with a lot of columns and want to summarise them with multiple functions.

I am trying to animate a flying cloth, which consists of individual rectangles, in Processing. I built the cloth from a nested loop. Now I want to use the noise function to manipulate the height of the individual points. Unfortunately, I can't do that properly - apparently I don't understand the function. I took a detour, drew noise clouds on a PGraphics, then read the brightness value - and use that to control the z-position of each rectangle. This works the way I want it to work!

Only - how can I achieve the same effect without going the detour via PGraphics? This is my code the way I want it (the detour):

I have this type of data, where the numerical values in column Sequ define a sequence of rows and the character value in Q names the type of sequence:

I have an university exercise, where I have to compare some hashing methods with their number of colisions in the hash table. Then I made theses Digit Analysis algorithms, but they are using A LOT of memory (I can't even run the code until the end, because it kills my computer). You can ignore the comments, but fell free if you want and knows portuguese.

Digit Analysis function 1 (Using dinamic matrix)

I'm trying to edit a schedule file in pandas, python 3 and am very stuck at the moment.

Basically, I have a schedule file like this:

Having a data frame, I want to generate a new list-column containing named vector(s) (one vector per row). Each vector derives its names and values from 2 other data frame columns. But I'm stuck because I want to do it:

• by group
• as computationally-efficient as possible

Let's take mpg dataset from {ggplot2} to illustrate the by group principle. I want to lump together pairs of cty and hwy values, grouped by distinct combinations of manufacturer & year. So we can do: