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Mod of negative number is melting my brain
...
or variants thereof.
The reason it works is that "x%m" is always in the range [-m+1, m-1]. So if at all it is negative, adding m to it will put it in the positive range without changing its value modulo m.
share
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Many-to-many relationship with the same model in rails?
... information.
TL;DR
# user.rb
has_many :friendships, :foreign_key => "user_id", :dependent => :destroy
has_many :occurances_as_friend, :class_name => "Friendship", :foreign_key => "friend_id", :dependent => :destroy
..
# friendship.rb
belongs_to :user
belongs_to :friend, :class_n...
How to disable UITextField editing but still accept touch?
...method
- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string
Return NO from this, and any attempt by the user to edit the text will be rejected.
That way you can leave the field enabled but still prevent people pasting text i...
What's the syntax for mod in java
...modular because n (mod m) IS ALWAYS >= 0 but not n % m. n % m is in the range > -m and < m. Although Java has a remainder operator for int and long types, it has no modulus function or operator. I.e., -12 % 10 = -2 whereas -12 mod 10 = 8. If % operator returns a negative value for n % m, th...
Why do indexes in XPath start with 1 and not 0?
...ry, RSS feeds (and the XML data they contained) were read by humans in the raw format. Blogs and other news sources used RSS feeds and XML to output continuously updated information. Since XML was being read by mere mortals (non-programmers), XPath and XSLT also needed to be easily understandable, s...
Generating random number between 1 and 10 in Bash Shell Script [duplicate]
... answered Jan 24 '12 at 14:53
OrangeTuxOrangeTux
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Add single element to array in numpy
...nvert to an array afterward.
Using np.append:
b = np.array([0])
for k in range(int(10e4)):
b = np.append(b, k)
1.2 s ± 16.1 ms per loop (mean ± std. dev. of 7 runs, 1 loop each)
Using python list converting to array afterward:
d = [0]
for k in range(int(10e4)):
d.append(k)
f = np.arra...
generate days from date range
... starting from the current date. If you want to generate any kind of dates range (past, future, and in between), you will have to use this view instead:
CREATE VIEW dates AS
SELECT
SUBDATE(CURRENT_DATE(), number) AS date
FROM
numbers
UNION ALL
SELECT
ADDDATE(CURRENT_DATE(), numb...
How can I generate random alphanumeric strings?
... (and thus time) efficient than the given one return new string(Enumerable.Range(1, length).Select(_ => chars[random.Next(chars.Length)]).ToArray());
– Tyson Williams
Nov 11 '16 at 18:06
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Mockito: InvalidUseOfMatchersException
...othing().when(cmd).dnsCheck(HOST, any(InetAddressFactory.class))
uses one raw value and one matcher, when it's required to use either all raw values or all matchers. A correct version might read
doNothing().when(cmd).dnsCheck(eq(HOST), any(InetAddressFactory.class))
...