我必须以R Markdown pdf格式输入统计数据。我能够成功地将我的答案转换为R Markdown文件，但是某些代码行不适合页面。
我必须打破的行类型如下所示：
```{r}
gayssmw1 <- subset(gay, study == 1 & wave == 1 & treatment == "Same-Sex Marriage Script by Gay Canvasser")
mean(gayssmw1$ssm)
gayssmstraightw1 <- subset(gay, study == 1 & wave == 1 & treatment == "Same-Sex Marriage Script by Straight Canvasser")
mean(gayssmstraightw1$ssm)
gayssmcontrolw1 <- subset(gay, study == 1 & wave == 1 & treatment == "No Contact")
mean(gayssmcontrolw1$ssm)
mean(gayssmcontrolw1$ssm) - mean(gayssmw1$ssm)
mean(gayssmcontrolw1$ssm) - mean(gayssmstraightw1$ssm)
```
我转回R Studio并开始在需要的地方首先插入换行符+ shift，然后尝试在R Markdown Basics网站上找到的双重空间。
现在这些行适合页面，但现在代码中此行中断所关注的所有结果都显示为：
> gayssmw1 <- subset(gay, study == 1 & wave == 1 & treatment == "Same-Sex
Marriage Script by Gay Canvasser")
> mean(gayssmw1$ssm)
[1] NaN
等。
我该怎么办？