大约有 9,900 项符合查询结果（耗时：0.0219秒） [XML]
How to create a drop-down list?
...d.
//There are multiple variations of this, but this is the basic variant.
ArrayAdapter<String> adapter = new ArrayAdapter<>(this, android.R.layout.simple_spinner_dropdown_item, items);
//set the spinners adapter to the previously created one.
dropdown.setAdapter(adapter);
Notes:
You...
How does one write code that best utilizes the CPU cache to improve performance?
...wers to this. Anyway, one classic example is to iterate a multidimensional array "inside out":
pseudocode
for (i = 0 to size)
for (j = 0 to size)
do something with ary[j][i]
The reason this is cache inefficient is because modern CPUs will load the cache line with "near" memory addresses fro...
How to check that an element is in a std::set?
...hout the utility functions below, but doesn't
// work for fixed-length arrays.
//return contains(container.begin(), container.end(), value);
}
template<class T> inline
bool contains(const std::set<T>& container, const T& value)
{
return container.find(value) != conta...
PHP Get all subdirectories of a given directory
...
you can use glob() with GLOB_ONLYDIR option
or
$dirs = array_filter(glob('*'), 'is_dir');
print_r( $dirs);
share
|
improve this answer
|
follow
...
Order of serialized fields using JSON.NET
...my case niaher's solution did not work because it didn't handle objects in arrays.
Based on his solution this is what I came up with
public static class JsonUtility
{
public static string NormalizeJsonString(string json)
{
JToken parsed = JToken.Parse(json);
JToken normali...
How to understand nil vs. empty vs. blank in Ruby
... object and is true if the object is nil.
.empty? can be used on strings, arrays and hashes and returns true if:
String length == 0
Array length == 0
Hash length == 0
Running .empty? on something that is nil will throw a NoMethodError.
That is where .blank? comes in. It is implemented by Rails...
Reading an Excel file in PHP [closed]
...lsx->rows() );
} else {
echo SimpleXLSX::parseError();
}
Output
Array (
[0] => Array
(
[0] => ISBN
[1] => title
[2] => author
[3] => publisher
[4] => ctry
)
[1] => Array
(
...
Run an OLS regression with Pandas Data Frame
...r suggestions: you can use sm.add_constant to add an intercept to the exog array and use a dict: reg = ols("y ~ x", data=dict(y=y,x=x)).fit()
– javadba
Jul 4 '17 at 22:38
...
Deleting all files from a folder using PHP?
...lete everything from folder (including subfolders) use this combination of array_map, unlink and glob:
array_map( 'unlink', array_filter((array) glob("path/to/temp/*") ) );
This call can also handle empty directories ( thanks for the tip, @mojuba!)
...
How to parse a JSON string to an array using Jackson
...String, new TypeReference<List<SomeClass>>() { });
SomeClass[] array = mapper.readValue(jsonString, SomeClass[].class);
share
|
improve this answer
|
follow
...