::: warning 关于本节代码的验证状态 Step 1 改写自 Reg 矢量计算概述 的官方示例。文档构建检查用于验证页面生成和站内链接， 不代表 API 示例已通过设备运行验证。所以请把它当作 结构正确的起点，而不是保证可运行的代码——第一次跑的时候对照报错逐步调整是正常的。

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