# Tag: programming | Page 0

Post #2

##### Optimization Learning Notes 1

*book*
Public Date: 2020-06-20 08:42:04.801901

*update*
Update Date: 2020-07-30 15:33:51.919974

Modeling Mathematically, an optimization problem is usually represented as: $$ \begin{aligned} \text{maximize/minimize}_x &~ f(x) \ \text{subject to} &~ x \in \Omega \end{aligned} $$ where: - $x$ is the decision variable - $f$ is the objective function - ...Read More Raw Content

Post #6

##### Optimization Learning Notes 2

*book*
Public Date: 2020-06-20 17:12:00.571290

*update*
Update Date: 2020-07-30 15:34:13.181702

Recall that the standard of an LP is like the following: $$ \begin{aligned} \min &~~~ c^Tx \ \text{subject to} &~~~ Ax = b \ &~~~ x \ge 0 \end{aligned} $$ where $x \in \mathbb R^n, b \in \mathbb R^m, A \in \mathbb R^{m\times n}$ In the following discussio...Read More Raw Content

Post #7

##### A Bad Day with MinGW TLS

*book*
Public Date: 2020-06-23 18:59:52.751680

*update*
Update Date: 2020-06-23 19:03:41.398479

It is always a bad experience to debug all day and get no progress at all. Unfortunately, it is exactly want I was doing yesterday and I am really out of patience now. It all started with a CI failure. Yes, as you can see from the following issues and com...Read More Raw Content

Post #8

##### Optimization Learning Notes 3

*book*
Public Date: 2020-06-24 11:49:25.724151

*update*
Update Date: 2020-07-30 15:34:37.990602

Two-Phase Method with Simplex Tableau TL;DR, two-phase method involves two LP and can be solved by construct two simplex tableau. However, there two things to consider: - How to acquire the initial tableau in Phase I. - How to make the transition from Ph...Read More Raw Content

Post #9

##### Happy Postgresql

*book*
Public Date: 2020-06-25 03:27:40.366366

*update*
Update Date: 2020-06-25 03:53:54.352076

I would like to summarize some highlights of postgresql usage in my own blog system. Random Draw It suddenly occurs to me that I would like to add a lucky draw function to my CMS. However, due to the data structure implementation, how to random select a ro...Read More Raw Content