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Write lines of text to a file in R
...ction which is opened for the duration of the function
call.
# default settings for writeLines(): sep = "\n", useBytes = FALSE
# so: sep = "" would join all together e.g.
share
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Most efficient way to store thousand telephone numbers
...= 1375 bytes.
If we want to know whether a certain phone number is in our set, we first check if the first five binary digits match the five digits we have stored. Then we split the remaining five digits into its top m=7 bits (which is, say, the m-bit number M) and its lower k=10 bits (the number K...
curl -GET and -X GET
...
-G converts a POST + body to a GET + query
You can ask curl to convert a set of -d options and instead of sending them in the request body with POST, put them at the end of the URL's query string and issue a GET, with the use of `-G. Like this:
curl -d name=daniel -d grumpy=yes -G https://example...
Django ModelForm: What is save(commit=False) used for?
...e:
class UserForm(forms.ModelForm):
...
def save(self):
# Sets username to email before saving
user = super(UserForm, self).save(commit=False)
user.username = user.email
user.save()
return user
If you didn't use commit=False to set the username to t...
What is the difference between NULL, '\0' and 0?
...'\0' is defined to be a null character - that is a character with all bits set to zero. This has nothing to do with pointers. However you may see something similar to this code:
if (!*string_pointer)
checks if the string pointer is pointing at a null character
if (*string_pointer)
checks if th...
How do I create a constant in Python?
...u should use the "property" function or decorator.
– Seth Johnson
Apr 21 '10 at 21:30
27
People a...
Difference in System. exit(0) , System.exit(-1), System.exit(1 ) in Java
...returned in unsigned context (in two's complement representation -1 always sets all bits regardless of number of bytes in the number). So -1 is usually returned when you're returning a non-specific error and don't want it to clash with possible error codes that are already defined and documented. e....
Swift 编程语言入门教程 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...造器。实现 area 和 describe 方法。
属性可以有 getter 和 setter 。
class EquilateralTriangle: NamedShape {
var sideLength: Double = 0.0
init(sideLength: Double, name: String) {
self.sideLength = sideLength
super.init(name: name)
numberOfSid...
Remove empty lines in text using Visual Studio
How to remove empty lines in Visual Studio?
11 Answers
11
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How to multiply duration by integer?
...e your variable addOneHrDuration of time time.Duration but then proceed to set it to 3600 ns not to one hour. A time.Duration happens to have base units of nanoseconds. To actually get a one hour duration you could do something like: const oneHourDuration = 60 * time.Hour (or 3600 * time.Second or t...