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How to draw vertical lines on a given plot in matplotlib?
...lines(x_pos, ymin=y1, ymax=y2)
to plot a vertical line at x_pos spanning from y1 to y2 where the values y1 and y2 are in absolute data coordinates.
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Jackson overcoming underscores in favor of camel-case
I retrieve a JSON string from internet; like most JSON I've seen it includes long keys that are separated by underscores. Essentially, my goal is to deserialize JSON into java-objects, but I don't use underscores in java-code.
...
What does static_assert do, and what would you use it for?
... your comment: yes, you can have static_assert just sitting out wherever, from the look of it:
class Foo
{
public:
static const int bar = 3;
};
static_assert(Foo::bar > 4, "Foo::bar is too small :(");
int main()
{
return Foo::bar;
}
$ g++ --std=c++0x a.cpp
a.cpp:7: error:...
error: request for member '..' in '..' which is of non-class type
... have mandated "void" parameter so that this usage would have been allowed from consistency point of view. If I am not mistaken, K&R C had mandatory usage of term void.
– Rajesh
Jan 22 '18 at 5:08
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JSON.parse vs. eval()
... are using eval() to interpret "user input" - which is ANY source external from your JavaScript (including returned values from servlets or other web services you've called). You cannot guarantee users have not entered malicious JavaScript either directly into your client app, or indirectly because ...
Reference: What is variable scope, which variables are accessible from where and what are “undefined
What is "variable scope" in PHP? Are variables from one .php file accessible in another? Why do I sometimes get "undefined variable" errors?
...
How to return an empty ActiveRecord relation?
...ils 4
In Rails 4, a chainable ActiveRecord::NullRelation will be returned from calls like Post.none.
Neither it, nor chained methods, will generate queries to the database.
According to the comments:
The returned ActiveRecord::NullRelation inherits from
Relation and implements the Null Obje...
How to calculate the number of occurrence of a given character in each row of a column of strings?
...ng, fixed = "a")
# [1] 2 1 0
benchmark
Compared to the fastest approach from @42-'s answer and to the equivalent function from the stringr package for a vector with 30.000 elements.
library(microbenchmark)
benchmark <- microbenchmark(
stringi = stringi::stri_count(test.data$string, fixed =...
What is the difference between “int” and “uint” / “long” and “ulong”?
...
@JacoPretorius Thats wrong. 8 bit int has a range from –128 to 127. The 9th bit represents 256. So with 8 bits you can represent all values up to 255 (9th val - 1). The range from -128 to 127 has a length of exactly 255. So there is no bit that holds the sign. All values u...
How to add multiple objects to ManyToMany relationship at once in Django ?
...
A short experiment from the shell shows that @sdolan is in fact (currently) incorrect. I.e. when I look at the generated SQL I see only a single insert statement: INSERT INTO app_one_twos (one_id, two_id) VALUES (1, 1), (1, 2), (1, 3), (1, 4)...