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Mean per group in a data.frame [duplicate]
...ersion. What should I use intead? I tried summarise_at or _if or_all. but didn't work .
– ferrelwill
Dec 4 '17 at 22:22
2
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Center/Set Zoom of Map to cover all visible Markers?
...d therefore does not do anything. To change the viewport while the map is hidden, set the map to visibility: hidden, thereby ensuring the map div has an actual size.
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Get hostname of current request in node.js Express
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Did the trick, thanks! In Express 4, I had to do this update: req.headers.host
– Gene Bo
Jun 24 '15 at 3:07
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Single Line Nested For Loops
...nt structure for loop? And how would it look?
Sure, but it's not a great idea. Here, for example, gives you a list of lists of characters:
[[ch for ch in word] for word in ("apple", "banana", "pear", "the", "hello")]
sha...
How to get the current time in milliseconds from C in Linux?
...include <math.h>
#include <stdio.h>
#include <time.h>
void print_current_time_with_ms (void)
{
long ms; // Milliseconds
time_t s; // Seconds
struct timespec spec;
clock_gettime(CLOCK_REALTIME, &spec);
s = spec.tv_sec;
ms = round(...
Return type of '?:' (ternary conditional operator)
...ve to implicitly promote the type of x to match the type of y (since both sides of : are not of the same type), and with that it has to create a temporary.
What does the standard say? (n1905)
Expressions 5.17 Assignment and compound assignment operators
5.17/3
If the second and third operand ...
What is “X-Content-Type-Options=nosniff”?
...structs browsers to disable content or MIME sniffing which is used to override response Content-Type headers to guess and process the data using an implicit content type. While this can be convenient in some scenarios, it can also lead to some attacks listed below. Configuring your server to return ...
How do I send a JSON string in a POST request in Go
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@Altenrion +1 for solid band name suggestion.
– Charlie Schliesser
Mar 30 '18 at 19:10
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Angularjs $q.all
... deferred.resolve(data);
})
When you write var deferred= $q.defer(); inside a for loop it's hoisted to the top of the function, it means that javascript declares this variable on the function scope outside of the for loop.
With each loop, the last deferred is overriding the previous one, there is...
What does “#define _GNU_SOURCE” imply?
...eed with the standards committee on how the functions should behave and decided to do their own thing.
As long as you're aware of these things, it should not be a problem to define _GNU_SOURCE, but you should avoid defining it and instead define _POSIX_C_SOURCE=200809L or _XOPEN_SOURCE=700 when po...