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Memoization in Haskell?
...tion (fix)
Let's define f, but make it use 'open recursion' rather than call itself directly.
f :: (Int -> Int) -> Int -> Int
f mf 0 = 0
f mf n = max n $ mf (n `div` 2) +
mf (n `div` 3) +
mf (n `div` 4)
You can get an unmemoized f by using fix f
This...
What should main() return in C and C++?
...d termination) according to the C++ standard. For C, re-entering main() is allowed, but should be avoided.
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How to have the cp command create any necessary folders for copying a file to a destination [duplica
... the mkdir/cp command above. It just creates a single level of folder. Actually I'm not sure when it can be useful.
– Penghe Geng
Apr 13 '15 at 14:30
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PDO support for multiple queries (PDO_MYSQL, PDO_MYSQLND)
...at name is still PDO_MYSQL. So now ND is default driver for MySQL+PDO.
Overall, to execute multiple queries at once you need:
PHP 5.3+
mysqlnd
Emulated prepared statements. Make sure PDO::ATTR_EMULATE_PREPARES is set to 1 (default). Alternatively you can avoid using prepared statements and use $pdo...
Total memory used by Python process?
...os
import psutil
process = psutil.Process(os.getpid())
print(process.memory_info().rss) # in bytes
On my current Python 2.7 install with psutil 5.6.3, the last line should be
print(process.memory_info()[0])
instead (there was a change in the API).
Note: do pip install psutil if it is not in...
Eclipse error: 'Failed to create the Java Virtual Machine'
...swered Sep 4 '11 at 22:52
Matt BallMatt Ball
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Is there a way to chain multiple value converters in XAML?
...
@DLeh This is not really elegant as is doesn't work. It provides all converters with final target type instead of correct target type...
– Aleksandar Toplek
Sep 7 '15 at 10:53
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How to easily resize/optimize an image size with iOS?
...its original size, I'm planning on resizing the image to something a bit smaller to save on space/performance.
18 Answers
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Where can I find my .emacs file for Emacs running on Windows?
I tried looking for the .emacs file for my Windows installation for Emacs, but I could not find it. Does it have the same filename under Windows as in Unix?
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append multiple values for one key in a dictionary [duplicate]
...st of values associated with that year, right? Here's how I'd do it:
years_dict = dict()
for line in list:
if line[0] in years_dict:
# append the new number to the existing array at this slot
years_dict[line[0]].append(line[1])
else:
# create a new array in this slo...