broadcast! 的显式调用、或者像 A .+ b 或 f.(x, y) 这样的「点」操作隐式触 发。任何具有 axes 且支持索引的对象都可作为参数参与广播，默认情况下，广播结果储存在 Array 中。这个基本框架可通过三个主要方式扩展： • 确保所有参数都支持广播 • 为给定参数集选择合适的输出数组 • 为给定参数集选择高效的实现 16.5. 自定义广播 169 不是所有类型都支持 axes 和索引，但许多类型便于支持广播。Base SparseVecStyle 与 0 维或 1 维数组的组合会产生另一个 SparseVecStyle，与 2 维数组 的组合会产生 SparseMatStyle，而与维度更高的数组则回退到任意维密集矩阵的框架中。这些规则 允许广播为产生一维或二维输出的操作保持其稀疏表示，但为任何其它维度生成 Array。 Chapter 17 模块 Julia 中的模块（module）是一些互相隔离的可变工作空间，也就是说它们会引入新的全局作用域。它 pretty-printing。 22.3 IO 输出的上下文信息 有时，IO 输出可受益于将上下文信息传递到 show 方法的能力。IOContext 对象提供了将任意元数据 与 IO 对象相关联的框架。例如，:compact => true 向 IO 对象添加一个参数来提示调用的 show 方法 应该打印一个较短的输出（如果适用）。有关常用属性的列表，请参阅 IOContext 文档。 22.4

100%|████████████████████████████████| Time: 0:00:00 Main binary filename not available. Serving web UI on http://localhost:62261 "alloc-profile.pb.gz" Then you can view the profile by navigating to 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 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

100%|████████████████████████████████| Time: 0:00:00 Main binary filename not available. Serving web UI on http://localhost:62261 "alloc-profile.pb.gz" Then you can view the profile by navigating to 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 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

100%|████████████████████████████████| Time: 0:00:00 Main binary filename not available. Serving web UI on http://localhost:62261 "alloc-profile.pb.gz" Then you can view the profile by navigating to 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 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 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 1113 49.1 Example In the example below we use a scoped value to implement a permission check in a web-application. After determining the permissions of the request, a new dynamic scope is entered and

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 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 1107 49.1 Example In the example below we use a scoped value to implement a permission check in a web-application. After determining the permissions of the request, a new dynamic scope is entered and

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 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 end 49.1 Example In the example below we use a scoped value to implement a permission check in a web-application. After determining the permissions of the request, a new dynamic scope is entered and

100%|████████████████████████████████| Time: 0:00:00 Main binary filename not available. Serving web UI on http://localhost:62261 "alloc-profile.pb.gz" Then you can view the profile by navigating to 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 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

100%|████████████████████████████████| Time: 0:00:00 Main binary filename not available. Serving web UI on http://localhost:62261 "alloc-profile.pb.gz" Then you can view the profile by navigating to 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 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

100%|████████████████████████████████| Time: 0:00:00 Main binary filename not available. Serving web UI on http://localhost:62261 "alloc-profile.pb.gz" Then you can view the profile by navigating to 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 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