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Find the day of a week
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To get the weekday number (0-6,Sun-Sat) from the date you can do: format(as.Date(df$date),"%w") . For the format code details see stat.berkeley.edu/~s133/dates.html
– JStrahl
Apr 24 '15 at 22:44
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Disable/turn off inherited CSS3 transitions
...t sets the transition time to 0, which effectively prevents the transition from being noticeable. The use of the a.noTransition selector is simply to provide a specific selector for the elements without transitions.
Edited to note that @Frédéric Hamidi's answer, using all (for Opera, at least) ...
How do I pass command-line arguments to a WinForms application?
...form class, add a parameterized constructor which accepts the input values from Program class as like below.
public Form1(string s, int i)
{
if (s != null && i > 0)
MessageBox.Show(s + " " + i);
}
To test this, you can open command prompt and go to the location where this ex...
How do I break out of a loop in Perl?
..."){
last;
}
}
If you have nested loops, then last will exit from the innermost loop. Use labels in this case:
LBL_SCORE: {
for my $entry1 (@array1) {
for my $entry2 (@array2) {
if ($entry1 eq $entry2) { # Or any condition
last LBL_SCORE;
...
Django set default form values
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If you are creating modelform from POST values initial can be assigned this way:
form = SomeModelForm(request.POST, initial={"option": "10"})
https://docs.djangoproject.com/en/1.10/topics/forms/modelforms/#providing-initial-values
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Why is String.chars() a stream of ints in Java 8?
...
The answer from skiwi covered many of the major points already. I'll fill in a bit more background.
The design of any API is a series of tradeoffs. In Java, one of the difficult issues is dealing with design decisions that were made lo...
How to undo 'git reset'?
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3f6db14 HEAD@{0}: HEAD~: updating HEAD
d27924e HEAD@{1}: checkout: moving from d27924e0fe16776f0d0f1ee2933a0334a4787b4c
[...]
The first line says that HEAD 0 positions ago (in other words, the current position) is 3f6db14; it was obtained by resetting to HEAD~. The second line says that HEAD 1 po...
Why does pthread_cond_wait have spurious wakeups?
...ous wakeup' could mean:
A thread blocked in pthread_cond_wait can return from the call even though no call to pthread_call_signal or pthread_cond_broadcast on the condition occurred.
A thread blocked in pthread_cond_wait returns because of a call to pthread_cond_signal or pthread_cond_broadcast, h...
How do I automatically update a timestamp in PostgreSQL
...mp, only if the values changed
Based on E.J's link and add a if statement from this link (https://stackoverflow.com/a/3084254/1526023)
CREATE OR REPLACE FUNCTION update_modified_column()
RETURNS TRIGGER AS $$
BEGIN
IF row(NEW.*) IS DISTINCT FROM row(OLD.*) THEN
NEW.modified = now();
...
Multiple constructors in python? [duplicate]
...e fd is a file-like object.
self.fd = fd
@classmethod
def fromfilename(cls, name):
return cls(open(name, 'rb'))
# Now you can do:
c = C(fd)
# or:
c = C.fromfilename('a filename')
Notice all those classmethods still go through the same __init__, but using classmethods can ...