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how does multiplication differ for NumPy Matrix vs Array classes?
...om numpy import linalg as LA
>>> import numpy as NP
>>> a1 = NP.matrix("4 3 5; 6 7 8; 1 3 13; 7 21 9")
>>> a1
matrix([[ 4, 3, 5],
[ 6, 7, 8],
[ 1, 3, 13],
[ 7, 21, 9]])
>>> a2 = NP.matrix("7 8 15; 5 3 11; 7 4 9; 6 15 4")
>>>...
Use of 'prototype' vs. 'this' in JavaScript?
... = function( value ) {
this.x = function() { alert( value ); }
};
var a1 = new A();
var a2 = new A();
a1.x(); // Displays 'A'
a2.x(); // Also displays 'A'
a1.updateX('Z');
a1.x(); // Displays 'Z'
a2.x(); // Still displays 'A'
// Here x is a method assigned to the object using "prototype"
v...
grep using a character vector with multiple patterns
...lso need to not have the spaces in your regular expression. It should be "A1|A9|A6".
You also mention that there are lots of patterns. Assuming that they are in a vector
toMatch <- c("A1", "A9", "A6")
Then you can create your regular expression directly using paste and collapse = "|".
ma...
How to use phpexcel to read data and insert into database?
... //SET property
$objPHPExcel->getActiveSheet()->getStyle('A1:M10001')->applyFromArray($styleArray);
$objPHPExcel->getActiveSheet()->getStyle('A1:M10001')->getAlignment()->setWrapText(true);
$objPHPExcel->getActiveSheet()->getStyle('A1:'.chr(65+count($fi...
What is a regular expression for a MAC Address?
...
pilcrowpilcrow
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...
SQL - Update multiple records in one query
...users
SET base_id = CASE user_id
WHEN 78 THEN 999
WHEN 77 THEN 88
ELSE base_id END WHERE user_id IN(78, 77)
78,77 are the user Ids and for those user id I need to update the base_id 999 and 88 respectively.This works for me.
...
Output array to CSV in Ruby
...
I've got this down to just one line.
rows = [['a1', 'a2', 'a3'],['b1', 'b2', 'b3', 'b4'], ['c1', 'c2', 'c3'], ... ]
csv_str = rows.inject([]) { |csv, row| csv << CSV.generate_line(row) }.join("")
#=> "a1,a2,a3\nb1,b2,b3\nc1,c2,c3\n"
Do all of the above and sa...
How can I uninstall an application using PowerShell?
...
Robert WagnerRobert Wagner
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...
How do I send a POST request as a JSON?
...-SP-GATEWAY', 'client_id_asdfeavea561va9685e1gre5ara|client_secret_4651av5sa1edgvawegv1a6we1v5a6s51gv') req.add_header('X-SP-USER-IP', '127.0.0.1') req.add_header('X-SP-USER', '| ge85a41v8e16v1a618gea164g65') req.add_header('Content-Type', 'application/json') print(req)...
...
How do I check to see if a value is an integer in MySQL?
...GNED ) // will return 0 if not numeric string.
for example
SELECT CAST('a123' AS UNSIGNED) // returns 0
SELECT CAST('123' AS UNSIGNED) // returns 123 i.e. > 0
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