KnitR在块和内联代码中如何不同地处理输出数字? [英] How are output digits handled differently by KnitR in chunks and inline code?

问题描述

我对KnitR如何以块和内联代码(\Sexpr{})不同地处理输出的digits感到困惑.通常，我希望对它们进行相同的处理.一旦我了解了如何为两种类型的输出设置选项，就不会出现任何问题，而这在手册中是找不到的.请参阅下面的MWE.

I am confused about how KnitR handles the digits of output differently in chunks and in inline code with \Sexpr{}. Generally, I want them to be handled the same. This should not pose any problem once I understand how to set the options for both types of output, which I have not found in the manual. Please see the MWE below.

\documentclass[12pt, english, oneside]{amsart}
\begin{document}
<<>>=
options(digits=2)
pi
@
\Sexpr{pi}
\end{document}

如果您不想编译它，则块打印3.1，而\Sexpr打印3.14.

In case you don't feel like compiling this, the chunk prints 3.1 whereas the \Sexpr prints 3.14.

推荐答案

根据?options:

 ‘digits’: controls the number of digits to print when printing
      numeric values.  It is a suggestion only.  Valid values are
      1...22 with default 7.  See the note in ‘print.default’ about
      values greater than 15.

请特别注意这只是一个建议.但是在knitr中，默认情况下根据getOption('digits')对内联号进行round()

Note in particular It is a suggestion only. But in knitr, the inline numbers are round()ed according to getOption('digits') by default.

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