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Difference between doseq and for in Clojure
What's the difference between doseq and for in Clojure? What are some examples of when you would choose to use one over the other?
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How do I do a not equal in Django queryset filtering?
...hem but it seems they can be negated and combined much like normal python expressions.
Update: I Just tried it out, it seems to work pretty well:
>>> from myapp.models import Entry
>>> from django.db.models import Q
>>> Entry.objects.filter(~Q(id = 3))
[<Entry: Entry ...
Expert R users, what's in your .Rprofile? [closed]
...Hook(packageEvent("grDevices", "onLoad"),
function(...) grDevices::X11.options(width=8, height=8,
xpos=0, pointsize=10,
#type="nbcairo")) # Cairo device
#...
Index all *except* one item in python
Is there a simple way to index all elements of a list (or array, or whatever) except for a particular index? E.g.,
9 An...
Why does Stream not implement Iterable?
...hing that can only be used once — more like an Iterator.
If Stream extended Iterable then existing code might be surprised when it receives an Iterable that throws an Exception the
second time they do for (element : iterable).
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Is there a difference between “throw” and “throw ex”?
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Yes, there is a difference;
throw ex resets the stack trace (so your errors would appear to originate from HandleException)
throw doesn't - the original offender would be preserved.
static void Main(string[] args)
{
try
{
Method2();
}
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Should I use multiplication or division?
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Python:
time python -c 'for i in xrange(int(1e8)): t=12341234234.234 / 2.0'
real 0m26.676s
user 0m25.154s
sys 0m0.076s
time python -c 'for i in xrange(int(1e8)): t=12341234234.234 * 0.5'
real 0m17.932s
user 0m16.481s
sys 0m0.048s
multi...
How to install mongoDB on windows?
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On a side note Windows XP support is discontinued from v2.2+ docs.mongodb.org/manual/release-notes/2.2/…
– Prashant Bhate
Aug 31 '12 at 11:40
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How to change the opacity (alpha, transparency) of an element in a canvas element after it has been
... seem to affect image drawing.
//works with shapes but not with images
ctx.fillStyle = "rgba(255, 255, 255, 0.5)";
I have concluded that setting the globalCompositeOperation works with images.
//works with images
ctx.globalCompositeOperation = "lighter";
I wonder if there is some kind third ...
How can I determine if a JavaScript variable is defined in a page? [duplicate]
...ariable is defined in a page? Suppose I want to check if a variable named "x" is defined in a page, if I do if(x != null) , it gives me an error.
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