RMarkdown中带双引号的逐字代码块

Question

如@Yihui的4.7 Verbatim code chunks的R Markdown Cookbook所示，我们可以显示逐字内联表达式， //This working code is for windows hdc mouse coords gives the angle back that is used in windows. It assumes point 1 will be your origin point // Tested and working on VS 2017 using 2 mouse coordinates in hdc. // //code to call our function. float angler = get_angle_2points(Point1X, Point1Y, Point2X, Point2Y); // Takes 2 Window coords(points), turns them into vectors using the origin and calculates the angle around the xaxis between them. // This function can be used for any hdc window. Ie 2 mouse points. float get_angle_2points(int p1x, int p1y, int p2x,int p2y) { //Make point1 the origin, make point2 relative to the origin so we do point1 - point1, and point2-point1, //since we dont need point1 for the equation to work, the equation works correctly with the origin 0,0. int deltaY = p2y - p1y; int deltaX = p2x - p1x; //Vector 2 is now relative to origin, the angle is the same, we have just transformed it to use the origin. float angleInDegrees = atan2(deltaY, deltaX) * 180 / 3.141; angleInDegrees *= -1; // Y axis is inverted in computer windows, Y goes down, so invert the angle. //Angle returned as: // 90 // 135 45 // // 180 Origin 0 // // -135 -45 // // -90 // returned angle can now be used in the c++ window function used in text angle alignment. ie plf->lfEscapement = angle*10; return angleInDegrees; } ，例如，在我们的RMarkdown输出中。 但是，此`r knitr::inline_expr("coef(summary(model))")`无法解析带有双引号的代码，例如 knitr::inline_expr()。 那么，当我想演示包含这样特殊字符的逐字记录时该怎么办？

`r knitr::inline_expr("coef(summary(model))["(Intercept)", "Estimate"]")`

Answer 1

您可以转义双引号：

---
title: "Untitled"
author: "CLRR"
date: "2020/6/20"
documentclass: article
output:
  bookdown::pdf_document2:
    latex_engine: xelatex
    keep_tex: TRUE
---

This verbatim can appear in the output:

`r knitr::inline_expr("coef(summary(model))[\"(Intercept)\", \"Estimate\"]")`

在注释中，@ monte提供了另一种解决方案，即交替使用单引号和双引号：knitr::inline_expr('coef(summary(model))["(Intercept)", "Estimate"]')