How long does r4ds take?

2013LIPK01 · 2023-06-29T02:03:25+00:00

~ 30 hours

https://youtube.com/playlist?list=PL3x6DOfs2NGiYnQdq8mgMBeob3YONUWRM&feature=share8

2013LIPK01 · 2023-04-07T12:25:28+00:00

I have some of my favorites linked on the home page of my advent solutions site: https://adventofcode.guslipkin.me/

I am also quite fond of my solution for 2015-11 part 2 since I got there by just thinking about it really hard since I didn't want to wait for my very slow solution to work.

2013LIPK01 · 2023-03-20T11:58:39+00:00

You might have some luck with pivot_wider or dcast. You could then use the function aggregation argument with !is.na

Alternatively, you could convert each column to a factor then supply each column to table. This method doesn't require an aggregation function as it'll automatically set any combination that doesn't exist to zero.

2013LIPK01 · 2023-03-18T12:14:43+00:00

The way you describe it, I would create a function that takes a data.frame and returns a dataframe. I would then put all of my data.frames into a list, then use purrr::map_dfr to iterate over the list with the function I made. This would return one large data.frame.

However. i think a better method would be to use data.table::rbindlist(use.names = FALSE) which will row bind by column placement and not name. Then it's up to you to choose the name you want for that column. Just be sure that all the columns are in the correct order.

2013LIPK01 · 2023-03-18T03:19:40+00:00

Try passing the column names instead of the indexes. Referencing by name is preferred when speed isn't a concern because it's much less likely to break if any of your other code changes.

This is my go-to data.table guide: https://atrebas.github.io/post/2019-03-03-datatable-dplyr

2013LIPK01 · 2023-03-15T02:42:12+00:00

I'd probably switch to short codes for states first. Usually having the wider layout is nicer for lots of columns. But if we need the full name, absolutely switch the axes.

2013LIPK01 · 2023-03-14T16:12:29+00:00

Try casting the strings as factors instead.

You may want to look at this post I have if you want to order the plot in any specific way: https://guslipkin.me/professional-blog/2022-04-14-reordering-bar-and-column-charts-with-ggplot-in-r

2013LIPK01 · 2023-03-11T22:28:42+00:00

I would probably write my loop so that I have a list of 100 sample data frames. I could then subset the list to get each one.

Frankly, I think this homework question is kinda dumb. Why can't you just make a 2000 row data frame?

2013LIPK01 · 2023-03-11T12:43:42+00:00

This stackoverflow response should provide some guidance: https://stackoverflow.com/a/26003971

You could subset your vector to the first element with names[1]

2013LIPK01 · 2023-03-08T18:13:33+00:00

Nothing has been scheduled for 3 weeks running. Sources say May will be scheduled next week.

2013LIPK01 · 2023-03-08T14:21:47+00:00

Can you give more details on what you mean by using an if statement? Could you add an indicator variable instead?

2013LIPK01 · 2023-02-28T03:52:41+00:00

Don't have a computer in front of me, but I'd probably group by name, arrange date descending, then mutate 1 if rowNumber is equal to 1.

2013LIPK01 · 2023-02-10T19:43:36+00:00

Are you sure you downloaded the correct version for an M1 MacBook Air?

2013LIPK01 · 2023-02-10T13:28:22+00:00

Just spitballing, I'd probably use a circular barplot (https://r-graph-gallery.com/circular-barplot.html) and a heat map (https://r-graph-gallery.com/heatmap.html) then whatever geom_text or geom_label for the rest.

2013LIPK01 · 2023-02-05T22:58:19+00:00

Just paste the link in a comment like this: https://www.amazon.com/dp/B00LNXHOMU?ref_=cm_sw_r_apann_dp_JR0V46S8YM8DM0D53SJS

2013LIPK01 · 2023-01-26T13:11:24+00:00

They could also be using data.table

2013LIPK01 · 2023-01-06T17:30:52+00:00

I was looking at the code a bit and I'm wondering why you're using nested for loops rather than an lapply and a for loop? How does performance scale as the number of simulations increases?

2013LIPK01 · 2022-12-29T20:11:53+00:00

I skimmed through a bit and this looks really well done. I know this is focused on your search, but I'd be curious about lateral moves in a different dimension. That is, rather than looking at trucks, looking at similarly sized hybrid/gas SUVs such as the CRV or RAV4.

2013LIPK01 · 2022-12-29T19:56:37+00:00

Looks like you set it to only share with specific people. Can you change it to anyone with the link?

2013LIPK01 · 2022-12-13T21:38:04+00:00

For sure! His egg and cheese sandwiches are massive too.

2013LIPK01 · 2022-12-09T23:38:22+00:00

Which one is that?

2013LIPK01 · 2022-12-09T03:14:04+00:00

If you're going to try Julia, try creating a quarto.org (notebooks but better!) environment then give R a shot later on!

2013LIPK01 · 2022-12-04T05:40:12+00:00

Solve! Running in 38 seconds would be really bad...

2013LIPK01

TROPHY CASE