Question

我可以在R Markdown / Knitr文档中使用以前准备好的变量吗？

例如，我首先在RStudio中创建$sql = "SELECT id, nivel, tipo, titulo, texto, ativa FROM account.quests_faq WHERE ativa='YES' ORDER BY nivel DESC"; // look this string contains SQL query. so, the variable is named $sql $stmt = $conn->query($sql); // in the next line we are getting a statement object from the function query() // this is why variable called $stmt while($row = $stmt->fetch(PDO::FETCH_ASSOC)){ // and now we can start iterating this statement. // statement, Carl. Not connection to database // which is called $conn, if you get an idea。它在全局环境/值中显示为列表。然后我想从R Markdown中调用它，例如：

g <- ggplot(df,...

我希望有一个很好的R Markdown文档，没有大量代码。

Answer 1

使用RData的一个选项：准备ggplot并将其保存为RData，然后以降价方式加载。

PreparePlot.R

String accessToken;
accessToken = accessToken.substring(13,accessToken.lastIndexOf("&"));

myReport.Rmd

library(ggplot2)
myPlot <- ggplot(mtcars,aes(mpg,cyl)) + geom_point()
save.image("myPlot.RData")

另一种选择是使用--- title: "Untitled" output: html_document --- ```{r GGPlot} library(ggplot2) load("C:/Path/to/myPlot.RData") myPlot ```：

myPlotSource.R

source

myReport.Rmd

library(ggplot2)
myPlot <- ggplot(mtcars,aes(mpg,cyl)) + geom_point()
print(myPlot)

使用准备好的变量

1 个答案: