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Split comma-separated strings in a column into separate rows
... is the fastest1.
The benchmarked solutions include
Matthew Lundberg's base R approach but modified according to Rich Scriven's comment,
Jaap's two data.table methods and two dplyr / tidyr approaches,
Ananda's splitstackshapesolution,
and two additional variants of Jaap's data.table methods.
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Filter rows which contain a certain string
...good things about Stringr
We should use rather stringr::str_detect() than base::grepl(). This is because there are the following reasons.
The functions provided by the stringr package start with the prefix str_, which makes the code easier to read.
The first argument of the functions of stringr p...
Real World Example of the Strategy Pattern
...oring information: We want the application to store information to the Database, but later it may need to be able to save a file, or make a webcall
Outputting: We need to output X as a plain string, but later may be a CSV, XML, JSON, etc.
Examples
I have a project where the users can assign pro...
What is RSS and VSZ in Linux memory management
...;
}
int main(int argc, char **argv) {
ProcStatm proc_statm;
char *base, *p;
char system_cmd[1024];
long page_size;
size_t i, nbytes, print_interval, bytes_since_last_print;
int snprintf_return;
/* Decide how many ints to allocate. */
if (argc < 2) {
nbyte...
Python: Select subset from list based on index set
... for help, clarification, or responding to other answers.Making statements based on opinion; back them up with references or personal experience.To learn more, see our tips on writing great answers.
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How to avoid passing parameters everywhere in play2?
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Also, you can't do stuff based on requests in this way, can you.. , for example user specific settings..
– 0fnt
Jul 18 '14 at 12:54
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How do you calculate the average of a set of circular data? [closed]
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ackb is right that these vector based solutions cannot be considered true averages of angles, they are only an average of the unit vector counterparts. However, ackb's suggested solution does not appear to mathematically sound.
The following is a solution...
Do I need all three constructors for an Android custom view?
...code in this answer: stackoverflow.com/a/22780035/294884 which seems to be based on your answer - but note that the writer includes use of the Inflator ?
– Fattie
Nov 27 '16 at 1:44
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Objective-C parse hex string to integer
...ng a number, in Objective-C. I am willing to use both an objective, or a C-based method, either is fine.
7 Answers
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How can you hide database output in Rails console?
In newer version of Rails, I'm guessing from 3 up, database queries are output to the console. This is useful most of the time, but how can you hide it when you do not want to see it?
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