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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...
VBA - how to conditionally skip a for loop iteration
I have a for loop over an array. What I want to do is test for a certain condition in the loop and skip to the next iteration if true:
...
Most pythonic way to delete a file which may not exist
...ou don't have to mess around creating an exception in order to ensure that test coverage metrics are relevant.
– thclark
Oct 28 '19 at 10:02
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Should I use #define, enum or const?
...e a mask to select records in certain states. Create an inline function to test if the value of the type is valid for your purpose; as a state marker vs a state mask. This will catch bugs as the typedef is just an int and a value such as 0xDEADBEEF may be in your variable through uninitialised or mi...
How to check if a Ruby object is a Boolean
...ess and everything is true except instances of FalseClass and nil
Boolean tests return an instance of the FalseClass or TrueClass
(1 > 0).class #TrueClass
The following monkeypatch to Object will tell you whether something is an instance of TrueClass or FalseClass
class Object
def boolean?...
How to access command line arguments of the caller inside a function?
...
One can do it like this as well
#!/bin/bash
# script_name function_test.sh
function argument(){
for i in $@;do
echo $i
done;
}
argument $@
Now call your script like
./function_test.sh argument1 argument2
shar...
Can you get DB username, pw, database name in Rails?
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I think this is the simplest solution. After some testing (in Rails 5.2 at least) this will resolve DATABASE_URL correctly.
ActiveRecord::Base.configurations[Rails.env]
share
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How to check if IEnumerable is null or empty?
...
If you are working with an IEnumerable, using Count() to test for emptyness is definitely a bad idea since the Linq implementation WILL iterate over the entire collection, while Any will just move the iterator once. Keep in mind that you can't use the Count property in this case si...
How to source virtualenv activate in a Bash script
...
no matter what I try, this source "/home/surest/Desktop/testservers/TEST_VENV/venv3/bin/activate" produces: /home/surest/Desktop/testservers/TEST_VENV/py3.sh: 10: /home/surest/Desktop/testservers/TEST_VENV/py3.sh: source: not found
– user4805123
...
find filenames NOT ending in specific extensions on Unix?
...tr
total 10
-rw-r--r-- 1 scripter linuxdumb 47 Dec 23 14:46 test1
-rw-r--r-- 1 scripter linuxdumb 0 Jan 4 23:40 test4
-rw-r--r-- 1 scripter linuxdumb 0 Jan 4 23:40 test3
-rw-r--r-- 1 scripter linuxdumb 0 Jan 4 23:40 test2
-rw-r--r-- ...