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Conditional Replace Pandas
I have a DataFrame, and I want to replace the values in a particular column that exceed a value with zero. I had thought this was a way of achieving this:
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Function to clear the console in R and RStudio
...ng function
clc <- function() cat(rep("\n", 50))
which you can then call as clc().
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Reading a string with scanf
...to its first element, so scanf("%s", string) is equivalent to scanf("%s", &string[0]). On the other hand, scanf("%s", &string) passes a pointer-to-char[256], but it points to the same place.
Then scanf, when processing the tail of its argument list, will try to pull out a char *. That's the...
Print all but the first three columns
...lt;=NF;i++)$(i-(n-1))=$i;NF=NF-(n-1);print $0}' n=4 | tr ' ' '-'
4-5-6-7
All other answers before Sep-2013 are nice but add extra spaces:
Example of answer adding extra leading spaces:
$ echo '1 2 3 4 5 6 7' |
awk '{$1=$2=$3=""}1' |
tr ' ' '-'
---4-5-6-7
Example of answer adding extra t...
Is “double hashing” a password less secure than just hashing it once?
...'t salted, they can be broken with a pre-computed dictionary attack (for example, using a Rainbow Table). Otherwise, the attacker must spend time to compute a hash for each password and see if it matches the stored hash.
All passwords are not equally likely. Attackers might exhaustively search all ...
Vagrant's port forwarding not working [closed]
I'm running into a small problem at the end of the Getting Started guide for vagrant . I'm working on a CentOS basebox that has Apache2 running (provisioning via Puppet). I've set up port forwarding for web requests using the following line in Vagrantfile :
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Configure apache to listen on port other than 80
...ttpd.conf here fileuploading.net/860467 nothing like WAMP, Xampp, Appserv. All I have done is compiling apache, tomcat and jk connector from source and trying my best to make them work together.
– vivek.m
Oct 15 '10 at 11:06
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Are typedef and #define the same in c?
...ine fail in casec of function pointer as argument?
– Allahjane
Dec 31 '16 at 23:02
3
@Allahjane: ...
What's the difference between a proxy server and a reverse proxy server? [closed]
..._vi/2008/01/updated-list-of.html
Forward proxy software (server side)
PHP-Proxy
cgi-proxy
phproxy (discontinued)
glype
Internet censorship wiki: List of Web Proxies
squid (apparently, can also work as a reverse proxy)
Reverse proxy software for HTTP (server side)
Apache mod_proxy (can als...
Get a specific bit from byte
...n be cheaply calculated by bit-shifting.
//your black magic
var bit = (b & (1 << bitNumber-1)) != 0;
EDIT: To add a little more detail because there are a lot of similar answers with no explanation:
A bitwise AND compares each number, bit-by-bit, using an AND join to produce a number t...