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NumPy or Pandas: Keeping array type as integer while having a NaN value
...s best to work with float series where possible, even when the series is upcast from int to float due to inclusion of NaN values. This enables vectorised NumPy-based calculations where, otherwise, Python-level loops would be processed.
The docs do suggest : "One possibility is to use dtype=object a...
Calculate the number of business days between two dates?
...I changed the last loop for a Linq statement: businessDays -= bankHolidays.Select(bankHoliday => bankHoliday.Date).Count(bh => firstDay <= bh && bh <= lastDay);
– JoanComasFdz
Nov 23 '12 at 8:40
...
A numeric string as array key in PHP
...
Yes, it is possible by array-casting an stdClass object:
$data = new stdClass;
$data->{"12"} = 37;
$data = (array) $data;
var_dump( $data );
That gives you (up to PHP version 7.1):
array(1) {
["12"]=>
int(37)
}
(Update: My original answe...
Can someone explain this 'double negative' trick? [duplicate]
... find it highly intuitive to know what's "falsey" and what's "truthy" when cast to a Boolean.
– Chris
Jul 30 '13 at 3:15
...
How to get an object's properties in JavaScript / jQuery?
...ct. Even most of those primitives are actually also objects with a limited selection of methods. They are cast into objects under the hood, when required. To know the base class name, you may invoke the Object.prototype.toString method on an object, like this:
alert(Object.prototype.toString.call([...
C++ convert from 1 char to string? [closed]
I need to cast only 1 char to string . The opposite way is pretty simple like str[0] .
2 Answers
...
How to convert object array to string array in Java
... Good point. I understood the toString as just being a way of casting to a String, not the intention of actually replacing the objects with something else. If that is what you need to do, then looping is the only way.
– Yishai
Jun 19 '09 at 16:14
...
What are the differences between Generics in C# and Java… and Templates in C++? [closed]
...tOfPerson.
The benefit of this is that it makes it really fast. There's no casting or any other stuff, and because the dll contains the information that this is a List of Person, other code that looks at it later on using reflection can tell that it contains Person objects (so you get intellisense a...
Best way to convert IList or IEnumerable to Array
...omething like this:
IEnumerable query = ...;
MyEntityType[] array = query.Cast<MyEntityType>().ToArray();
If you don't know the type within that method but the method's callers do know it, make the method generic and try this:
public static void T[] PerformQuery<T>()
{
IEnumerabl...
how to convert from int to char*?
...ne, except use const as:
char const* pchar = temp_str.c_str(); //dont use cast
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