Question

我能够创建一个采用数据框和变量名的函数。例如：

df <- data.frame(x1=rnorm(100, 1, 1),
                 y=runif(100,0,10))

test <- function(data, variable){
  arguments <- as.list(match.call())
  x <- as.character(arguments$variable)
  t <- sum(data[,x])
  return(t)
}
# This works
test(df, x1)

但同样的功能不起作用。例如：

---
title: "BUG"
runtime: shiny
output: html_document
---

# SET UP

```{r}
df <- data.frame(x1=rnorm(100, 1, 1),
                 y=runif(100,0,10))

test <- function(data, variable){
  arguments <- as.list(match.call())
  x <- as.character(arguments$variable)
  t <- sum(data[,x])
  return(t)
}
```

# THIS DOES NOT WORK

```{r}

selectInput("variable", "Variable:",
            colnames(df))

test(df, input$variable)
```

我做错了什么？

此示例显示了ggplot2

可能实现的目标

---
title: "ggplot2 works"
runtime: shiny
output: html_document
---

# This works

```{r}
library(ggplot2)
ggplot(mtcars, aes(wt, mpg)) + geom_point()
```

# This also works

```{r}
library(shiny)
inputPanel(
  selectInput("x", "x:", c("wt", "mpg")),

  selectInput("y", "y:", c("mpg", "wt"))
)
environment<-environment() 
myplot <- ggplot(mtcars, aes(get(input$x), get(input$y)), environment = environment) + geom_point()

renderPlot({
  myplot
})

```

创建具有变量名称的函数并使用闪亮的函数

0 个答案: