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Is there a way to detect if an image is blurry?
...nted Simon's suggestion and this one in Mathematica, and tried it on a few test images:
The first test blurs the test images using a Gaussian filter with a varying kernel size, then calculates the FFT of the blurred image and takes the average of the 90% highest frequencies:
testFft[img_] := Tab...
How do I redirect to the previous action in ASP.NET MVC?
... Just a suggestion: you can use "Redirect" explictly is harder to unit test your controller. You are better off using a "RedirectToAction" instead.
– Syd
Jun 10 '10 at 2:12
...
How can I reverse a list in Python?
...
When I tested this slicing was about twice as fast (when reversing a 10k elements list and creating a list from it). I did not test memory consumption though. reverse might be faster though, if you don't need to cast to list afterwa...
How can I use a Python script in the command line without cd-ing to its directory? Is it the PYTHONP
... a read of https://the-hitchhikers-guide-to-packaging.readthedocs.org/en/latest/ - 'The Hitchhiker's Guide to Packaging', and also http://docs.python.org/3/tutorial/modules.html - which explains PYTHONPATH and packages at a lower level.
...
How do I find the next commit in git? (child/children of ref)
...
@TomHale I cannot test it right now, but ask a new question (with OS and Git version), that way everyone can test.
– VonC
Sep 19 '16 at 6:43
...
Why is super.super.method(); not allowed in Java?
...ds T1 { int x = 2; }
class T3 extends T2 {
int x = 3;
void test() {
System.out.println("x=\t\t" + x);
System.out.println("super.x=\t\t" + super.x);
System.out.println("((T2)this).x=\t" + ((T2)this).x);
System...
How to count the number of set bits in a 32-bit integer?
...ke x86's popcnt, on CPUs where it's supported) will almost certainly be fastest. Some other architectures may have a slow instruction implemented with a microcoded loop that tests a bit per cycle (citation needed).
A pre-populated table lookup method can be very fast if your CPU has a large cache a...
Remove NA values from a vector
...ively slower (though I'll happily take comments on my implementation & test!)
microbenchmark::microbenchmark(
purrr::map(airquality,function(x) {x[!is.na(x)]}),
purrr::map(airquality,na.omit),
purrr::map(airquality, ~purrr::discard(.x, .p = is.na)),
times = 1e6)
Unit: microseconds
...
Detect Retina Display
...or in iOS4.2 for the iPad: it returns 1.0 in both 1x and 2x modes. You can test this yourself in the simulator.
I test for the -displayLinkWithTarget:selector: method on the main screen which exists in iOS4.x but not iOS3.2, and then check the screen's scale:
if ([[UIScreen mainScreen] respondsToS...
PHP function to get the subdomain of a URL
...mple.com => example.co.uk) and then use strstr to get the subdomains.
$testArray = array(
'sub1.sub2.example.co.uk',
'sub1.example.com',
'example.com',
'sub1.sub2.sub3.example.co.uk',
'sub1.sub2.sub3.example.com',
'sub1.sub2.example.com'
);
foreach($testArray as $k =>...