JULIA_HISTORY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 277 27.2 外部应用 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 277 JULIA_SHELL 的日常工作。偏爱动态语言有很多很好的理由，因此我们不会舍弃动态的特性。幸运的是，现代编 程语言设计与编译器技术可以大大消除性能折衷（trade-off），并提供有足够生产力的单一环境进行 原型设计，而且能高效地部署性能密集型应用程序。Julia 语言在这其中扮演了这样一个角色：它是 一门灵活的动态语言，适合用于科学计算和数值计算，并且性能可与传统的静态类型语言媲美。 由于 Julia 的编译器和其它语言比如 Python 4717266720048188im julia> sinh(1 + 2im) -0.4890562590412937 + 1.4031192506220405im 注意数学函数通常应用于实数就返回实数值，应用于复数就返回复数值。例如，当 sqrt 应用于 -1 与 -1 + 0im 会有不同的表现，虽然 -1 == -1 + 0im： julia> sqrt(-1) ERROR: DomainError with

documentation. – Interfaces for Julia packages are typically described using docstrings, README.md, static web pages, ... • Some developers choose not to export all symbols required to use their package/module \:bookmark_tabs: Bookmark Tabs U+1F4D2 \:ledger: Ledger U+1F4D3 \:notebook: Notebook U+1F4D4 \:notebook_with_deco- rative_cover: Notebook With Decorative Cover U+1F4D5 \:closed_book: Closed Book U+1F4D6 Julia is running in a JavaScript VM (JSVM), including e.g. a WebAssembly JavaScript embedding in a web browser. CHAPTER 41. ESSENTIALS 606 Julia 1.2 This function requires at least Julia 1.2. source

documentation. – Interfaces for Julia packages are typically described using docstrings, README.md, static web pages, ... • Some developers choose not to export all symbols required to use their package/module \:bookmark_tabs: Bookmark Tabs U+1F4D2 \:ledger: Ledger U+1F4D3 \:notebook: Notebook U+1F4D4 \:notebook_with_deco- rative_cover: Notebook With Decorative Cover U+1F4D5 \:closed_book: Closed Book U+1F4D6 Julia is running in a JavaScript VM (JSVM), including e.g. a WebAssembly JavaScript embedding in a web browser. Julia 1.2 This function requires at least Julia 1.2. source Base.Sys.loadavg – Function

documentation. – Interfaces for Julia packages are typically described using docstrings, README.md, static web pages, ... • Some developers choose not to export all symbols required to use their package/module \:bookmark_tabs: Bookmark Tabs U+1F4D2 \:ledger: Ledger U+1F4D3 \:notebook: Notebook U+1F4D4 \:notebook_with_deco- rative_cover: Notebook With Decorative Cover U+1F4D5 \:closed_book: Closed Book U+1F4D6 Julia is running in a JavaScript VM (JSVM), including e.g. a WebAssembly JavaScript embedding in a web browser. Julia 1.2 This function requires at least Julia 1.2. source Base.Sys.loadavg – Function

documentation. – Interfaces for Julia packages are typically described using docstrings, README.md, static web pages, ... • Some developers choose not to export all symbols required to use their package/module \:bookmark_tabs: Bookmark Tabs U+1F4D2 \:ledger: Ledger U+1F4D3 \:notebook: Notebook U+1F4D4 \:notebook_with_deco- rative_cover: Notebook With Decorative Cover U+1F4D5 \:closed_book: Closed Book U+1F4D6 Julia is running in a JavaScript VM (JSVM), including e.g. a WebAssembly JavaScript embedding in a web browser. Julia 1.2 This function requires at least Julia 1.2. source Base.Sys.loadavg – Function

documentation. – Interfaces for Julia packages are typically described using docstrings, README.md, static web pages, ... • Some developers choose not to export all symbols required to use their package/module \:bookmark_tabs: Bookmark Tabs U+1F4D2 \:ledger: Ledger U+1F4D3 \:notebook: Notebook U+1F4D4 \:notebook_with_deco- rative_cover: Notebook With Decorative Cover U+1F4D5 \:closed_book: Closed Book U+1F4D6 Julia is running in a JavaScript VM (JSVM), including e.g. a WebAssembly JavaScript embedding in a web browser. CHAPTER 41. ESSENTIALS 606 Julia 1.2 This function requires at least Julia 1.2. source

documentation. – Interfaces for Julia packages are typically described using docstrings, README.md, static web pages, ... • Some developers choose not to export all symbols required to use their package/module \:bookmark_tabs: Bookmark Tabs U+1F4D2 \:ledger: Ledger U+1F4D3 \:notebook: Notebook U+1F4D4 \:notebook_with_deco- rative_cover: Notebook With Decorative Cover U+1F4D5 \:closed_book: Closed Book U+1F4D6 Julia is running in a JavaScript VM (JSVM), including e.g. a WebAssembly JavaScript embedding in a web browser. CHAPTER 41. ESSENTIALS 606 Julia 1.2 This function requires at least Julia 1.2. source

documentation. – Interfaces for Julia packages are typically described using docstrings, README.md, static web pages, ... • Some developers choose not to export all symbols required to use their package/module \:bookmark_tabs: Bookmark Tabs U+1F4D2 \:ledger: Ledger U+1F4D3 \:notebook: Notebook U+1F4D4 \:notebook_with_deco- rative_cover: Notebook With Decorative Cover U+1F4D5 \:closed_book: Closed Book U+1F4D6 Julia is running in a JavaScript VM (JSVM), including e.g. a WebAssembly JavaScript embedding in a web browser. Julia 1.2 This function requires at least Julia 1.2. source Base.Sys.loadavg – Function

documentation. – Interfaces for Julia packages are typically described using docstrings, README.md, static web pages, ... • Some developers choose not to export all symbols required to use their package/module \:bookmark_tabs: Bookmark Tabs U+1F4D2 \:ledger: Ledger U+1F4D3 \:notebook: Notebook U+1F4D4 \:notebook_with_deco- rative_cover: Notebook With Decorative Cover U+1F4D5 \:closed_book: Closed Book U+1F4D6 Julia is running in a JavaScript VM (JSVM), including e.g. a WebAssembly JavaScript embedding in a web browser. Julia 1.2 This function requires at least Julia 1.2. source Base.Sys.loadavg – Function

documentation. – Interfaces for Julia packages are typically described using docstrings, README.md, static web pages, ... • Some developers choose not to export all symbols required to use their package/module \:bookmark_tabs: Bookmark Tabs U+1F4D2 \:ledger: Ledger U+1F4D3 \:notebook: Notebook U+1F4D4 \:notebook_with_deco- rative_cover: Notebook With Decorative Cover U+1F4D5 \:closed_book: Closed Book U+1F4D6 Julia is running in a JavaScript VM (JSVM), including e.g. a WebAssembly JavaScript embedding in a web browser. Julia 1.2 This function requires at least Julia 1.2. source Base.Sys.loadavg – Function