cowplot | Streamlined Plot Theme and Plot Annotations | Data Visualization library

I've built this new ggplot2 geom layer I'm calling geom_triangles (see https://github.com/ctesta01/ggtriangles/) that plots isosceles triangles given aesthetics including x, y, z where z is the height of the triangle and the base of the isosceles triangle has midpoint (x,y) on the graph.

What I want is for the geom_triangles() layer to automatically provide legend components for the height and width of the triangles, but I am not sure how to do that.

I understand based on this reference that I may need to adjust the draw_key argument in the ggproto StatTriangles object, but I'm not sure how I would do that and can't seem to find examples online of how to do it. I've been looking at the source code in ggplot2 for the draw_key functions, but I'm not sure how I would introduce multiple legend components (one for each of height and width) in a single draw_key argument in the StatTriangles ggproto.

I've generated a scatterplot with marginal histograms on the x and y axes, using this extremely helpful answer from @ClausWilke (reproduced below).

I am trying to trim the white space from a ggplot map plot that was created using geom_sf(). I have found multiple resources discussing removing white space when saving a plot using ggsave(). I am hoping to remove the white space without having to save it, though.

Removing white space using ggsave() - R ggplot, remove white margins in ggsave/ggplot

Please find below a reproducible example:

How can I modify the multiplot function to fit graphs that use coord_fixed() without white space between columns in Shiny plotOutput?

This is a small reproducible shiny app with the problem:

This is my code:

I'm just trying to plot the ROC curves in a plot grid in Rstudio, the neural net models are all working but the ROC curves just won't go in a grid layout, they plot individually but there's a lot more than this and the markdown file would be like 20 pages long. I've reduced all models to two neurons as dummy-data to make it run quickly, only setwd() and the read in data lines need to be adapted.

Here's the empty plot grids:

But here you can see they work and will plot individually:

Hi all I am working with a little dataframe to build some plots in ggplot2. My dataframe is df and I include it as dput() at the end. I have the plots and the problem rises when I use patchwork. I want the final plot without spaces so that the line in the middle, which is an axis, can join the plots together. Here is the code:

Here I have tried to plot a PDF of 11 variables using ggplot2 and stat_function.I have managed to add legend by colour but I want also to differentiate the lines by line type also and incorporate it into the legend. If anybody could help me with matter I would be thankful? Here is the code:

Sorry for the mess of how much code I'm posting but I'm missing one of the four ggplots using plot_grid with the package cowplot, there should be four in the grid and for some reason one of them is missing, does anyone know why?

Here's the plot_grids that are missing one of the four graphs:

Here's the error: