大约有 13,922 项符合查询结果（耗时：0.0183秒） [XML]
When to use nested classes and classes nested in modules?
... name of the class Wheel vs. Car::Wheel. This difference in name can make explicit to programmers that the Car::Wheel class can only represent a car wheel, as opposed to a general wheel. Nesting class definitions in Ruby is a matter of preference, but it serves a purpose in the sense that it more st...
nil detection in Go
... I think this is wrong, as it is always false: play.golang.org/p/g-MdbEbnyNx
– Madeo
Oct 16 '19 at 0:29
...
How can I check if a file exists in Perl?
...
Test whether something exists at given path using the -e file-test operator.
print "$base_path exists!\n" if -e $base_path;
However, this test is probably broader than you intend. The code above will generate output if a plain file exists at that...
Is there an R function for finding the index of an element in a vector?
In R, I have an element x and a vector v . I want to find the first index of an element in v that is equal to x . I know that one way to do this is: which(x == v)[[1]] , but that seems excessively inefficient. Is there a more direct way to do it?
...
How to make execution pause, sleep, wait for X seconds in R?
...ction, but ?sleep references a data set. And ?pause and ?wait don't exist.
2 Answers
...
Draw multi-line text to Canvas
A hopefully quick question, but I can't seem to find any examples... I'd like to write multi-line text to a custom View via a Canvas , and in onDraw() I have:
...
Why does integer division in C# return an integer and not a float?
...ing point number you would be forced to round the result every time. One example off of the top of my head is changing the base of a number. Calculating each digit involves the integer division of a number along with the remainder, rather than the floating point division of the number.
Because of...
How can I check for NaN values?
...
math.isnan(x)
Return True if x is a NaN (not a number), and False otherwise.
>>> import math
>>> x = float('nan')
>>> math.isnan(x)
True
...
SVG: text inside rect
I want to display some text inside SVG rect . Is it possible?
5 Answers
5
...
Cast List to List in .NET 2.0
...new int[] { 1,2,3 } );
List<string> l2 = l1.ConvertAll<string>(x => x.ToString());
share
|
improve this answer
|
follow
|
...