# All Posts | Page 1

Post #12
##### Optimization Learning Notes 6

book Public Date: 2020-08-08 12:48:20.617006

update Update Date: 2020-08-17 13:03:26.353419

Convexity
With KKT-conditions, we have already got some powerful tools to analysis the local minimizers, but when is a local minimizer also a global one? In a special category of optimization problems, the convex optimization, this is always true. In the f...

Post #11
##### Optimization Learning Notes 5

book Public Date: 2020-07-08 05:11:21.020777

update Update Date: 2020-08-08 01:55:03.360573

From this note, we will start talk about non-linear programs. To get a first glance of NLPs, let us first check out how we can issue the Interior Point Method.
Interior Point Method
Interior Point Method takes care of the primal and the dual problem at the...

Post #10
##### Optimization Learning Notes 4

book Public Date: 2020-07-02 15:02:38.926921

update Update Date: 2020-07-30 15:35:06.065394

Interpreting the Dual Problem
It turns out that dual problem actually have their own meanings. The interpretations of dual problems may give us a better understanding of the duality theory.
Production Planning
Production Planning problem is one of the most...

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...

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...