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ValueError: The truth value of an array with more than one element is ambiguous. Use a.any() or a.al
... commonly understood way to evaluate
an array in boolean context: it could mean True if any element is
True, or it could mean True if all elements are True, or True if the array has non-zero length, just to name three possibilities.
Since different users might have different needs and different ass...
Adding and removing style attribute from div with jquery
...
You could do any of the following
Set each style property individually:
$("#voltaic_holder").css("position", "relative");
Set multiple style properties at once:
$("#voltaic_holder").css({"position":"relative", "top":"-75px"});
Remove a specific style:
$("#voltaic_holder").css({"to...
How do lexical closures work?
...There is one problem with this solution: func has now two parameters. That means it doesn't work with a variable amount of parameters. Worse, if you call func with a second parameter this will overwrite the original i from the definition. :-(
– Pascal
Mar 28 '1...
How do I use Assert to verify that an exception has been thrown?
...his; check your test framework for options, or see if you can throw a more meaningful exception to test for.
catch (AssertionException) { throw; }
You should be able to adapt this approach to whatever you like -- including specifying what kinds of exceptions to catch. If you only expect certain t...
Entity framework code-first null foreign key
...u must make your foreign key nullable:
public class User
{
public int Id { get; set; }
public int? CountryId { get; set; }
public virtual Country Country { get; set; }
}
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improv...
Benchmarking (python vs. c++ using BLAS) and (numpy)
...umpy is using its internal fallback copy of BLAS, which is slower, and not meant to be used in performance computing!
The reply from @Woltan below indicates that this is the explanation for the difference he/she sees in Numpy vs. Ctypes+BLAS.
To fix the situation, you need either ATLAS or MKL --- ...
Is quoting the value of url() really necessary?
...nces, etc.), thus being cumbersome and not supporting url-modifiers.
That means, the url(...) syntax is supposed to be a functional notation, which takes a string and a url-modifier as parameters. Use the quote notation (which produces a string token) would be more standard-compliant and introduce ...
input type=“submit” Vs button tag are they interchangeable?
...HTML 6 will deprecate <button> in favour of something new. Does that mean we shouldn't mention a specific tag in answers at all, because it might change at some point in the future? I would prefer to leave it as an exercise to the reader to determine how answers apply to their situation. As lo...
Getting the client's timezone offset in JavaScript
... is the difference, in minutes, between UTC and local time. Note that this means that the offset is positive if the local timezone is behind UTC and negative if it is ahead. For example, if your time zone is UTC+10 (Australian Eastern Standard Time), -600 will be returned. Daylight savings time pre...
Center image horizontally within a div
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What exactly does designated width mean in this context? Definitely seems like useful knowledge to have.
– Shoaib
Jun 12 '12 at 1:09
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