R 绘图时文本上标的问题

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1. text(locator(1),expression(paste("N",H[4]," - N", " (mg/kg)")))

复制代码

想在NH后边加一个“+”的上标或者加一个文本的上标，怎么实现？

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关键词：Expression express Locator Xpress paste

text(locator(1),expression(paste("N",H[4]^"+"," - N", " (mg/kg)")))

text(locator(1),expression(paste("N",H[4]^"abc"," - N", " (mg/kg)")))

谢谢啦！

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text(locator(1),expression(paste("N",H[4]^"+"," - N", " (mg/kg)")))

text(locator(1),expression(paste("N",H[4]^"abc"," - N", " (mg/kg)")))