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How is this fibonacci-function memoized?
...nacci definition, fib n = fib (n-1) + fib (n-2), the function itself gets called, twice from the top, causing the exponential explosion. But with that trick, we set out a list for the interim results, and go "through the list":
fib n = (xs!!(n-1)) + (xs!!(n-2)) where xs = 0:1:map fib [2..]
The tr...
Separation of business logic and data access in django
...de is confusing and, after a certain time, I cease to understand what is really happening.
10 Answers
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Calling shell functions with xargs
...format:
$ echo '$(date)' | xargs -I {} bash -c 'echo_var "{}"'
Sun Aug 18 11:56:45 CDT 2019
Another example of why not:
echo '\"; date\"' | xargs -I {} bash -c 'echo_var "{}"'
This is what is output using the safe format:
$ echo '$(date)' | xargs -I {} bash -c 'echo_var "$@"' _ {}
$(date)
T...
How to remove a project (from the workspace) in PHPStorm?
...
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**Two Approaches for PHPSTORM 2018.3 Version **
A. Eternal Removal or Deletion from Hardware ...
Android Studio: Android Manifest doesn't exists or has incorrect root tag
...
Thanks. Hope all the answers keep helping people.
– axierjhtjz
Sep 26 '14 at 16:04
4
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Naming convention for unique constraint
...
answered Jan 29 '11 at 13:19
gbngbn
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How do you use gcc to generate assembly code in Intel syntax?
...ax.
example: mov eax, 0xFF -> TRUE, mov eax, 0FFh -> FALSE.
That's all.
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Differences between “BEGIN RSA PRIVATE KEY” and “BEGIN PRIVATE KEY”
...Y algorithm OPTIONAL
}
So for an RSA private key, the OID is 1.2.840.113549.1.1.1 and there is a RSAPrivateKey as the PrivateKey key data bitstring.
As opposed to BEGIN RSA PRIVATE KEY, which always specifies an RSA key and therefore doesn't include a key type OID. BEGIN RSA PRIVATE KEY is P...
How can I shuffle the lines of a text file on the Unix command line or in a shell script?
... well, you get the picture. It has been pointed out that sort -R doesn't really shuffle but instead sort items according to their hash value.
[Editor's note: sort -R almost shuffles, except that duplicate lines / sort keys always end up next to each other. In other words: only with unique input lin...
Regex replace uppercase with lowercase letters
...rs as well :
find:
([A-Z])(.*)
replace:
\L$1$2 --> will convert all letters in $1 and $2 to lowercase
BUT
\l$1$2 --> will only convert the first letter of $1 to lowercase and leave everything else as is
The same goes for uppercase with \U and \u
...