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What is the difference between bottom-up and top-down?
...way that avoids recalculating duplicate work. You have a main problem (the root of your tree of subproblems), and subproblems (subtrees). The subproblems typically repeat and overlap.
For example, consider your favorite example of Fibonnaci. This is the full tree of subproblems, if we did a naive r...
PHP session lost after redirect
...rol panel (or equivalent), but you can also create a test.php file on your root directory and type:
<?php echo $_SERVER['SCRIPT_FILENAME']; ?>
The bit before 'test.php' is your home directory path. And of course, make sure that the folder actually exists within your root directory. (Some pr...
How can the Euclidean distance be calculated with NumPy?
...t(x^2 + y^2 + z^2)) so we're making a lot of sqrt calls. Math 101:
dist = root ( x^2 + y^2 + z^2 )
:.
dist^2 = x^2 + y^2 + z^2
and
sq(N) < sq(M) iff M > N
and
sq(N) > sq(M) iff N > M
and
sq(N) = sq(M) iff N == M
In short: until we actually require the distance in a unit of X rather th...
Where is PHP.ini in Mac OS X Lion? Thought it was in /usr/local/php5/lib
... right on my Mac, uncommented httpd.conf, activated web sharing, installed MySQL etc.
I can't seem to find my PHP files, most importantly, PHP.ini.
...
Wait for a process to finish
...
I found "kill -0" does not work if the process is owned by root (or other), so I used pgrep and came up with:
while pgrep -u root process_name > /dev/null; do sleep 1; done
This would have the disadvantage of probably matching zombie processes.
...
How to make an app's background image repeat
...
/* View someView = (View)findViewById(R.layout.main);
// Find the root view
View root = someView.getRootView();*/
// Set the color
/*root.setBackgroundColor(color.darker_gray);*/
share
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How to update a record using sequelize for node?
...xpress-resource, and Sequelize that is used to manage datasets stored in a MySQL database.
13 Answers
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Difference between method and function in Scala
...his abomination has been struck from the language?
– root
Jul 1 '13 at 21:19
2
@root - what about...
Semicolons superfluous at the end of a line in shell scripts?
... on terminal or in shell script.
See the below examples:
On terminal:
[root@server test]# ls;pwd;
On shell script:
[root@server test]# cat test4.sh
echo "Current UserName:"
whoami
echo -e "\nCurrent Date:";date;
[root@server test]#
But I am not agree with the comment that & is equi...
java.net.UnknownHostException: Invalid hostname for server: local
...es this environment variable ($HOSTNAME) when it connects to the server.
[root@xyz ~]# echo $HOSTNAME
xyz
[root@xyz ~]# ping $HOSTNAME
ping: unknown host xyz
[root@xyz ~]# hostname -f
hostname: Unknown host
There are dozens of things that can cause this. Please comment if you discover a new re...