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Split comma-separated strings in a column into separate rows
...= median(time), N = .N), by = .(n_row, expr)]
mba[, expr := forcats::fct_reorder(expr, -median_time)]
Create chart
library(ggplot2)
ggplot(mba, aes(n_row, median_time*1e-6, group = expr, colour = expr)) +
geom_point() + geom_smooth(se = FALSE) +
scale_x_log10(breaks = NROW(director) * n_rep...
Check if two lists are equal [duplicate]
...
var a = ints1.SequenceEqual(ints2);
Or if you don't care about elements order use Enumerable.All method:
var a = ints1.All(ints2.Contains);
The second version also requires another check for Count because it would return true even if ints2 contains more elements than ints1. So the more correct...
What is an Intent in Android?
...firstapp/starting-activity.html#BuildIntent
As the document describes, in order to start an activity (you also need to understand what activity is) use the intent like below
/** Called when the user clicks the Send button */
public void sendMessage(View view) {
Intent intent = new Intent(this,...
How does the Brainfuck Hello World actually work?
...
Zeroes are offset. 82 is first and c5 is second byte representing ł (in order we will read them). |..| is graphical representation which is not possible in this case.
Well, if you pass ł as input to your BF program that reads single byte, program memory will look like:
...[0][0][*197*][0][0].....
Why is Lisp used for AI? [closed]
...here. But I think Lisp was successful in AI research for three reasons (in order of importance):
Lisp is an excellent prototyping tool. It was the best for a very long time. Lisp is still great at tackling a problem you don't know how to solve yet. That description characterises AI perfectly.
Lisp...
UICollectionView inside a UITableViewCell — dynamic height?
... Here's what fixed it for me - in systemLayoutSizeFitting, reverse the order of what's shown in the answer currently, so that first collectionView.layoutIfNeeded() runs, then collectionView.frame = CGRect.init(origin: .zero, size: CGSize.init(width: targetSize.width, height: 1))
...
Quicksort vs heapsort
... Quicksort. Heapsort doesn't need more memory for another array to putting ordered data as is needed by Mergesort. So why do comercial applications stick with Quicksort? What Quicksort has that is so special over others implementations?
I've tested the algorithms myself and I've seen that Quicksort...
How can I remove duplicate rows?
...VER (PARTITION BY Col1, Col2, Col3
ORDER BY ( SELECT 0)) RN
FROM #MyTable)
DELETE FROM cte
WHERE RN > 1;
I am using ORDER BY (SELECT 0) above as it is arbitrary which row to preserve in the event of a tie.
To preserve the latest one in RowID...
What is a semaphore?
...task to another. A mutex is meant to be taken and released, always in that order, by each task that uses the shared resource it protects. By contrast, tasks that use semaphores either signal or wait—not both. For example, Task 1 may contain code to post (i.e., signal or increment) a particular sem...
Why is it string.join(list) instead of list.join(string)?
...ng join on strins side-steps this problem at the cost of the "unintuitive" order. A better choice might have been to keep it a function with the first argument being the iterable and the second (optional one) being the joiner string - but that ship has sailed.
– user4815162342
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