Article directory refer to environment Recommended reading MD5 toughness vulnerability md5() implicit type conversion String concatenation computation Boolean judgment equality operator Scientific notation Scientific notation Prefix 0E and 0e Specific rules for converting strings into numerical values in PHP8 and other versions of PHP PHP8 numeric string optimization Other versions A more detailed explanation Weak […]
Tag: formula
Use applescript to automate trilium’s mathematical formula environment (2)
9.23 ver1 Unexpectedly, I was very energetic today. While playing chatgpt, I suddenly thought, why not let him write a code for me? Just do it. However, maybe because my English is not very good, the whole thing generated by chatgpt is really a thorn in the side. So I think I should figure out […]
The winning formula for slow SQL
In preparation for major promotions, one of the biggest hidden dangers is slow SQL, which is the most destructive to the smooth operation of services. It is also the biggest hidden danger that often causes jitter to the entire application in daily work. How to avoid slow SQL in daily development? We must know what […]
Formulas and uses of circle and trigonometric functions
Foreword This blog is to record the application of trigonometric functions and circle codes. It mainly relies on trigonometric functions to obtain the coordinate values on the circle. Get the coordinate value on the circle in the polar coordinate system You need to use this formula during development only when you move the Canvas center […]
Ural1519 Formula 1(plug dp)
Original title URL: http://acm.timus.ru/problem.aspx?space=1 & amp;num=1519 For plug dp and status compression, please refer to: http://wenku.baidu.com/link?url=AFuYe_EfR5yXMNK0rY-TaLe6LLgKhsOVxBM1RQULxElPrvjQVlO724nUxlXtaDx4aLp7FHIz8AexYiTy06_r4CV5XUs6c9lM5vpz5kDr6HG http://wenku.baidu.com/view/a6dce6c76137ee06eff918d1.html Detailed code (c++11): using bracket notation and minimal notation. Note: When using minimum representation, the data type must use long long (__int64), and the corresponding shift must be performed with long long. Using int will cause overflow! 1. […]
Process string formulas and convert them into mathematical formulas to calculate the results—no dependencies on the version—complete using the stack
Process string formulas and convert them into mathematical formulas to calculate the results: How to convert string to mathematical formula? 1. Dependencies need to be introduced **JEP (Java Math Expression Parser)** Library: EP is a powerful Java library for parsing and evaluating mathematical expressions. It supports variables, functions, constants, etc., and can handle various mathematical […]
Spherical harmonic function analysis Actual particle shape formula derivation and numerical implementation Part 3 Particle shape analysis
Reference: 3D quantitative shape analysis on form, roundness, and compactness with μCT https://www.sciencedirect.com/science/article/pii/S0032591015302345 1. Types of shape analysis 1. Macroscopic shape (Aspect ratio, AR aspect ratio) Transpose the voxels of the particles, Corresponding to the directions respectively, ,，is the average of the two. Transpose code: % Transpose into a format in which x, y, and […]
[Latex] Formula editing, numbering, alignment [hold]
Introduction area \documentclass{article} \usepackage{amsmath,amssymb,amsfonts,}%math-mathematical formula; symb-mathematical symbol; fonts-font size; Environment Whether to enter math mode Whether to accept optional parameters Whether to fill the entire line th> Whether to generate a number Remarks align Yes No Yes Yes align* does not generate a number, others are the same as align aligned No Yes No Not […]
NTC temperature sampling binary lookup table and formula method
NTC temperature sampling: This article records the NTC temperature sampling, which is described using the binary lookup table method and the formula method. Resource download link:Excel generates array table https://download.csdn.net/download/qq_41359157/88326839?spm=1001.2014.3001.5503 NTC parameters: NTC sampling circuit: 1. Binary look-up table method: Binary search is very efficient. Assuming the data size is n, the data will be […]
100 ArcGIS attribute query formulas
The essence of the ArcGIS attribute query formula mentioned here is to build query conditions for the SQL query statement of the database when querying data through attribute analysis in ArcMap. Therefore, the so-called query formula here is actually the query condition. I hope it can improve your work efficiency when processing map data. How […]