Understanding STG

Understanding IoC, DI and Reference Methods

I'm in the process of learning depenency injection and inversion of control, and I think I'm starting to understand how this works: Objects should not concern themselves with the creation of their own dependencies Dependencies should be passed to the

RewriteCond does not understand how to apply!

I have this RewriteRule ^articles/([0-9]+)-(.*)\.html$ article.php?id=$1 [L] RewriteRule .* index.php I still don't understand how to apply RewriteCond, due to [L] issues in .htaccess. Help!and thanks in advance :)There is an excellent reference ques

Trouble Understanding glOrtho

I'm new to openGL and im having trouble understanding the concept of glOrtho. for instance i have: void display(void) { /* clear all pixels */ glClear (GL_COLOR_BUFFER_BIT); /* draw black polygon (rectangle) with corners at * (0.25, 0.25, 0.0) and (0

Not able to understand program output C

There's this code in C int fun() { static int num = 40; return num--; } int main() { for(fun(); fun(); fun()) { printf("%d ", fun()); } getchar(); return 0; } the output comes out to be: 38 35 32 29 26 23 20 17 14 11 8 5 2 I'm not able to figure

I do not understand why digital sorting functions work with Javascript

I understand that the .sort() method sorts an array alphabetically, as if it was a string. Even if your array is made up entirely of numbers. I also understand that to sort an array numerically, the code is: myArray.sort(function (a,b) { return a-b;

Understand the embedded PHP ternary operator

I dont understand how that output ("four") comes? $a = 2; echo $a == 1 ? 'one' : $a == 2 ? 'two' : $a == 3 ? 'three' : $a == 5 ? 'four' : 'other' ; // prints 'four' I don't understand why "four" gets printed.You need to bracket the ter

Understanding the regression function in Matlab

I'm having trouble understanding how regress works in Matlab. Say I have 2 arrays (X and Y), each having the same size (let's say they're each 1x10). From what I understand, the regress function should help me find the relationship between X and Y (I

Having trouble understanding the middleware

So I want to set up a basic node server to work with my clientside Angular application. My folder structure looks like this: .tmp //Contains css stylesheet bower //Obviously contains bower packages public //Contains client code This is what my index.

Need help understanding Big-O

I'm in a Data Structures class now, and we're covering Big-O as a means of algorithm analysis. Unfortunately after many hours of study, I'm still somewhat confused. I understand what Big-O is, and several good code examples I found online make sense.

Understanding "next" in ruby ​​- comparison solutions

I'm doing an online course: Write a method that takes a string and returns true if the letter "z" appears within three letters after an "a". You may assume that the string contains only lowercase letters. This is the solution given: de

Validation of the template form does not work and hellip; I do not understand why

model.py from django.core.exceptions import ValidationError def surname_validate(value): if value == "123": raise ValidationError('is not an even number') class Member(models.Model): surname=models.CharField(max_length=50,validators=[surname_val

Understand "maybe" in haskell

So say we have an example of a function sqrt that gives us the square root of a floating point number but does not abort on negative inputs. So what will be the type of sqrt. I was told the answer is: sqrt :: Maybe Float -> Float however i do not und

Understanding Complex SQL with Multiple Joins

I have a lengthy query which I am trying to understand. I learned in this forum that the best way to understand complex queries is to split them, check their results separately and then combine. I am pasting a part of code here. Please help me unders

Trying to understand the installation of a CGI script

This question already has an answer here: Why do people write #!/usr/bin/env python on the first line of a Python script? 18 answers http://www.tutorialspoint.com/python/python_cgi_programming.htm #!/usr/bin/python print "Content-type:text/html\r\n\r