rbind | ruby library for automatically generating ruby ffi bindings

I run a loop and append data into a list. I failed to convert the list to a data frame in the loop and only able to fix that in a later step and turn every 3 columns into a new row. I was wondering if I can transform a list into a data frame during the loop session.

I have a t.test function and I want to loop over myvec <- c("am", "vs"). any help will e appreciated, many thanks in advance.

I'm doing a project on Shiny where there are several drop-down menus. The options contained in the menus are stored in a data frame and when running the app you have the option to add more data to the data frame. The behavior I expected was that the options in the drop-down menu would automatically update with changes in the data frame, but this doesn't happen.

Is this possible to be done in Shiny? If yes, how?

Here's a code with an example of how I'm doing.

I'm doing some scraping, but as I'm parsing approximately 4000 URL's, the website eventually detects my IP and blocks me every 20 iterations.

I've written a bunch of Sys.sleep(5) and a tryCatch so I'm not blocked too soon.

I use a VPN but I have to manually disconnect and reconnect it every now and then to change my IP. That's not a suitable solution with such a scraper supposed to run all night long.

I think rotating a proxy should do the job.

Here's my current code (a part of it at least) :

I have two data frames. df1 and df2. both with c columns
using a clustering method, I ended up with 10 clusters. same clusters for each df is true. this means for example the 4th row of both df s go to the same cluster.
I added a cluster column to both dfs, showing the assigned cluster for each row.

I want to create a list.
this list contains 10 matrices, such that.
matrix 1, is a 2*c matrix. its first row is obtained by colmeans of those rows of df1 which are in cluster 1. and its 2nd row is obtained by colmeans of those rows of df2 which are in cluster 1.
and matrix 2 , colmeans of cluster 2 and so on.
this is what I ve done. but I get the 10th matrix only and not a list of matrices 1 to 10.
I would appreciate any help with this.

I get this most common error message in shiny app. I am well aware of this error and have resolved it dozens of time. But this time I am stumped.

Suppose that I have the following data

My problems seems simple, I am using ggplot2 with geom_jitter() to plot a variable. (take my picture as an example)

Jitter now adds some random noise to the variable (the variable is just called "1" in this example) to prevent overplotting. So I have now random noise in the y-direction and clearly what otherwise would be completely overplotted is now better visible.

But here is my question:

As you can see, there are still some points, that overplot each other. In my example here, this could be easily prevented, if it wouldn't be random noise in y-direction... but somehow more strategically placed offsets.

Can I somehow alter the geom_jitter() behavior or is there a similar function in ggplot2 that does exactly this?

Not really a minimal example, but also not too long:

I hope you can help me with something. Here would be some demo-code