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Compare two data.frames to find the rows in data.frame 1 that are not present in data.frame 2
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This doesn't answer your question directly, but it will give you the elements that are in common. This can be done with Paul Murrell's package compare:
library(compare)
a1 <- data.frame(a = 1:5, b = letters[1:5])
a2 <- data.frame(a = 1:3, b = letters[1:3])
compariso...
Fixed size queue which automatically dequeues old values upon new enques
...hared data structure which purpose is holding the last N objects passed to it (kind of history).
14 Answers
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Partly cherry-picking a commit with Git
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The core thing you're going to want here is git add -p (-p is a synonym for --patch). This provides an interactive way to check in content, letting you decide whether each hunk should go in, and even letting you manually edit the patch if necessary.
To use it in combin...
Two color borders
...I do this on one element? I was hoping to avoid stacking two DOM elements with individual borders.
11 Answers
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how to POST/Submit an Input Checkbox that is disabled?
I have a checkbox that, given certain conditions, needs to be disabled. Turns out HTTP doesn't post disabled inputs.
18 Ans...
Automatic popping up keyboard on start Activity
I got a relative simple question. I have an activity with a lot of EditText's in them. When I open the activity it automatically focusses to the first EditText and displays the virtual keyboard.
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How does the Windows Command Interpreter (CMD.EXE) parse scripts?
I ran into ss64.com which provides good help regarding how to write batch scripts that the Windows Command Interpreter will run.
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How to wait for all threads to finish, using ExecutorService?
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Basically on an ExecutorService you call shutdown() and then awaitTermination():
ExecutorService taskExecutor = Executors.newFixedThreadPool(4);
while(...) {
taskExecutor.execute(new MyTask());
}
taskExecutor.shutdown();
try {
taskExecutor.awaitTermination(Long.MAX_VALUE, TimeUnit.NA...
What does android:layout_weight mean?
... don't understand how to use this attribute. Can anyone tell me more about it?
13 Answers
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How to create a jQuery plugin with methods?
I'm trying to write a jQuery plugin that will provide additional functions/methods to the object that calls it. All the tutorials I read online (have been browsing for the past 2 hours) include, at the most, how to add options, but not additional functions.
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