JuliaLang/julia

Printf for complex numbers

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#58,617 建立於 2025年6月3日

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 (4 留言) (0 反應) (0 負責人)Julia (48,709 star) (5,773 fork)batch import
complexdisplay and printingfeaturehelp wanted

描述

Currently, @sprintf "%.2f" (1+2im) errors, but it would make sense for it to produce "1.00 + 2.00im" I think. Currently, printfing a complex number is not really convenient, requiring a manual split into real + complex, and keeping the format string in sync between them.

貢獻者指南

技術棧
無
領域
backend
議題類型
feature
難度面向新貢獻者的預計實作難度，1 表示很小改動，5 表示專家級工作。
3
預計時間有經驗貢獻者完成調查、實作、測試並準備 pull request 的粗略時間範圍。
half day
活動狀態議題目前的可參與程度：新鮮、活躍、陳舊、阻塞或等待維護者輸入。
fresh
清晰度議題是否清楚說明預期改動、驗收標準和下一步。
clear
前置要求
Familiarity with Julia's printf implementation
新手友善度1-100 的估計分數，表示該議題對首次貢獻者的友善程度。
60
研究方向
The issue requests that complex numbers be supported in printf format strings, e.g., @sprintf "%.2f" (1+2im) should produce "1.00 + 2.00im". Start by examining the current printf implementation in Julia's source, likely in base/printf.jl or similar. Understand how real numbers are formatted and how the Complex type's show method works (in base/complex.jl). There are no linked PRs, so a new implementation would need to extend the printf machinery to handle complex numbers, possibly by formatting real and imaginary parts separately and inserting a sign. Tests would need to be added in test/printf.jl.