Article directory Date design Date calculation related OJ questions HJ73 Calculate date to day conversion KY111 date difference KY222 Print date KY258 date accumulation In software development, dealing with dates is a common task. In order to easily manipulate dates, we can use the C++ programming language to create a simple date class. In this […]

# Tag: calc

## Data structure-heap sort and its complexity calculation

Table of Contents 1. Heap sort 1.1 Adjust heap construction upward 1.2 Adjust heap construction downwards 2. Comparison of time complexity between two heap building methods 2.1 Adjust downward the time complexity of heap building 2.2 Adjust the time complexity of heap construction upward Topk problem In the previous section, we talked about Heap implementation, […]

## Obtain sea breeze data and calculate sea breeze changes

1. Sea breeze raw data can be downloaded from the NOAA website in the United States https://www.ncei.noaa.gov/data/blended-global-sea-surface-wind-products/access/winds/daily/ 2. Taking the daily data in 2018 as an example, the program code for downloading sea breeze raw data using terminal commands is as follows. for string in uv20180114rt.nc uv20180115rt.nc uv20180116rt.nc uv20180117rt.nc uv20180118rt.nc uv20180119rt.nc uv20180120rt.nc uv20180121rt.nc uv2018 0122rt.nc […]

## GIS Tool 01- [Gaussian Plume] Apply java in GIS to implement model calculations

1 Simulation effect example 2 Gaussian model 2.1 Gaussian smoke model In sudden leakage accidents, pollution sources often suddenly release a large amount of harmful gases in a short period of time. At this time, the Gaussian puff model is suitable for solving the ground pollution concentration. The puff model assumes that the volume of […]

## Calculation process of multi-scale structural similarity L1 loss

Multi-scale structural similarity L1 loss SSIM Structural Similarity Index (SSIM) is an image quality measurement method used to evaluate the similarity between two images. SSIM is widely used for image quality assessment, performance evaluation of compression algorithms, image enhancement and restoration, etc. In application: The human eye perceives similarity between two images mainly based on […]

## MySQL Lecture 8·How to perform mathematical calculations, string processing and conditional judgment?

Hello, I am safe and sound. Article directory How to perform mathematical calculations, string processing and conditional judgment? Math functions String functions conditional judgment function Summarize How to perform mathematical calculations, string processing and conditional judgment? MySQL provides many functions that are powerful and very convenient to use, including mathematical functions, string processing functions, and […]

## Matlab calculates the solution of Ax=b, a ready-made tool for solving linear equations

1. Matlab solution Ax=b Only the simplest way is written, where b needs to be a column vector, and semicolons are used to separate elements; Ax = b where the matrix A(nxn) and the column vector b(n) are known; the solution of the system of equations is stored in x, written in matlab: > x=A\b […]

## HDU 1686: Oulipo ← KMP algorithm (overlapping calculations)

[Source of the question]http://acm.hdu.edu.cn/showproblem.php?pid=1686http://poj.org/problem?id=3461 [Title description] The French author Georges Perec (1936–1982) once wrote a book, La disparition, without the letter ‘e’. He was a member of the Oulipo group. A quote from the book: Tout avait Pair normal, mais tout s’affirmait faux. Tout avait Fair normal, d’abord, puis surgissait l’inhumain, l’affolant. son tapis, assailant […]

## Vue2 (2): calculated properties, monitoring properties

Article directory 1. Computed properties 1.1 Use interpolation syntax and methods to splice names 1.2 Use computed properties to splice names 1.3 Abbreviation of computed properties 1.4 Summary of computed properties 2. Monitoring attributes-watch 2.1 Weather case foreshadowing 2.2 Lead to monitoring attributes (1). Pass in the watch configuration when new Vue (2). Monitor through […]

## C++ code example: simple calculation tool for polynomial division

Article directory Preface code repository code illustrate core fragment result Summarize References Author’s words Foreword C++ code example: simple calculation tool for polynomial division. Code repository yezhening/Programming-examples: Programming examples (github.com) Programming-examples: Programming examples (gitee.com) Code Description Due to the large length of the code, it would be verbose to paste and present directly in the […]