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How can I delete multiple lines in vi?
...
I find this easier
Go VISUAL mode Shift+v
Select lines
d to delete
https://superuser.com/questions/170795/how-can-i-select-and-delete-lines-of-text-in-vi
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i...
Logical operators (“and”, “or”) in DOS batch
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De Morgan's laws allow us to convert disjunctions ("OR") into logical equivalents using only conjunctions ("AND") and negations ("NOT"). This means we can chain disjunctions ("OR") on to one line.
This means if name is "Yakko" or "Wakko" or "Dot", then ...
Common use-cases for pickle in Python
...tributed system (marshalling)
3) storing python objects in a database
4) converting an arbitrary python object to a string so that it can be used as a dictionary key (e.g. for caching & memoization).
There are some issues with the last one - two identical objects can be pickled and result in ...
Split a String into an array in Swift?
... Which is no longer the case in Swift 1.2, in which Apple no longer converts Swift's String into NSString automagically.
– elcuco
Jun 17 '15 at 14:02
6
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Most efficient way to reverse a numpy array
...onstructing a 1d array, transforming it into a 2d array, flipping it, then converting back into a 1d array. time.clock() will be used to keep time, which is presented in terms of seconds.
import time
import numpy as np
start = time.clock()
x = np.array(range(3))
#transform to 2d
x = np.atleast_2d(...
How to safely upgrade an Amazon EC2 instance from t1.micro to large? [closed]
...es" and create a Snapshot of your instance's volume.
Go to "Snapshots" and select "Create Image from Snapshot".
Go to "AMIs" and select "Launch Instance" and choose your "Instance Type" etc.
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JavaScript data formatting/pretty printer
...t')
{
if (value instanceof Array)
{
// Just let JS convert the Array to a string!
value = "[ " + value + " ]";
}
else
{
// Recursive dump
// (replace " " by "\t" or something else if you prefer)
var od = DumpObjectIndented(va...
Sort array of objects by object fields
...ber > $second->number;
});
UPDATED
with the string don't forget to convert to the same register (upper or lower)
// Desc sort
usort($array,function($first,$second){
return strtolower($first->text) < strtolower($second->text);
});
// Asc sort
usort($array,function($first,$secon...
How can I access the MySQL command line with XAMPP for Windows?
... The buffer size for TCP/IP and socket communication.
--select-limit=# Automatic limit for SELECT when using --safe-updates.
--max-join-size=# Automatic limit for rows in a join when using
--safe-updates.
--secure-auth Refuse client connecting ...
How to print out all the elements of a List in Java?
...nts are separated by the characters ", " (comma
and space). Elements are converted to strings as by
String.valueOf(Object).
If you are using any custom object in your list, say Student , you need to override its toString() method(it is always good to override this method) to have a meaningful ...