R:facet_wrap在Shiny app

时间:2017-09-26 10:14:27

标签: r shiny facet-grid ggplotly

当我在ggplotly()中为一个Shiny App做一个facet_grid时,有大量的分面组,情节搞砸了。但是它在Shiny之外正常工作。

我该如何解决这个问题? 我怀疑它与Y量表有关,但我找不到解决方案。


这是一个基于diamonds example from plotly的可重现示例。

闪亮与非闪亮输出的比较:Comparison of facet_grid outside and within Shiny

代码

  

外面有光泽:

library(ggplot2)

data(diamonds, package = "ggplot2")

# new faceting group
  diamonds$rdmGroup <- as.factor(sample(LETTERS, dim(diamonds)[1], replace=TRUE))

# subset of diamonds   
  diamonds <- diamonds[sample(nrow(diamonds), 1000),]

ggplot(diamonds , aes_string(x = diamonds$x, y = diamonds$y, color = diamonds$x)) + 
      geom_point() + facet_grid(rdmGroup~.) +
      guides(color=FALSE) +
      labs(x = "X", y="Y") 


  

Shiny App中的相同代码:

library(shiny)
library(plotly)
library(ggplot2)

data(diamonds, package = "ggplot2")

# new faceting group
  diamonds$rdmGroup <- as.factor(sample(LETTERS, dim(diamonds)[1], replace=TRUE))

# subset of diamonds   
  diamonds <- diamonds[sample(nrow(diamonds), 1000),]

ui <- fluidPage(
  headerPanel("Diamonds Explorer"),
  sidebarPanel(
    sliderInput('plotHeight', 'Height of plot (in pixels)', 
                min = 100, max = 2000, value = 1000) 
  ),
  mainPanel(
    plotlyOutput('trendPlot')
  )
)


server <- function(input, output) {

  output$trendPlot <- renderPlotly({ 
      p <- ggplot(diamonds, aes_string(x = diamonds$x, y =diamonds$y, color = diamonds$x)) + 
            geom_point()+ facet_grid(rdmGroup~., scales = "free_y") +
            labs(x = "X", y="Y")

      ggplotly(p) %>% 
            layout(height = input$plotHeight, autosize=TRUE)
  })
}
shinyApp(ui, server)

PS:我在我的真实应用程序中故意使用了aes_string()而不是aes()。

1 个答案:

答案 0 :(得分:0)

首先要注意的是,问题与Shiny无关,而是与ggplotly的使用无关。问题可以通过以下方式复制:

library(ggplot2)
library(plotly)

data(diamonds, package = "ggplot2")

# new faceting group
  diamonds$rdmGroup <- as.factor(sample(LETTERS, dim(diamonds)[1], replace=TRUE))

# subset of diamonds   
  diamonds <- diamonds[sample(nrow(diamonds), 1000),]

p <- ggplot(diamonds , aes_string(x = diamonds$x, y = diamonds$y, color = diamonds$x)) + 
      geom_point() + facet_grid(rdmGroup~.)

ggplotly(p)

虽然你需要一些东西来查看输出,这可能是shiny

在回答你的问题时,问题似乎是你不能超过25个方面。如果您从rdmGroup中删除任何一个组,则plotly输出正常工作,例如。

diamonds <- subset(diamonds, rdmGroup != "Q")

更新您的闪亮示例:

library(shiny)
library(plotly)
library(ggplot2)

data(diamonds, package = "ggplot2")

# new faceting group
diamonds$rdmGroup <- as.factor(sample(LETTERS, dim(diamonds)[1], replace=TRUE))

# subset of diamonds   
diamonds <- diamonds[sample(nrow(diamonds), 1000),]
diamonds <- subset(diamonds, rdmGroup != "Q")

ui <- fluidPage(
  headerPanel("Diamonds Explorer"),
  sidebarPanel(
    sliderInput('plotHeight', 'Height of plot (in pixels)', 
                min = 100, max = 2000, value = 1000) 
  ),
  mainPanel(
    plotlyOutput('trendPlot')
  )
)


server <- function(input, output) {

  output$trendPlot <- renderPlotly({ 
    p <- ggplot(diamonds, aes_string(x = diamonds$x, y =diamonds$y, color = diamonds$x)) + 
      geom_point()+ facet_grid(rdmGroup~., scales = "free_y") +
      labs(x = "X", y="Y")

    ggplotly(p) %>% 
      layout(height = input$plotHeight, autosize=TRUE)
  })
}
shinyApp(ui, server)

提供以下输出: output

解决方法可能只是拥有多个绘图,将数据集拆分为25个。

编辑:我做了一些研究,当面板边距太大而无法显示所有图时,绘图停止按预期显示。您可以通过减少panel.spacing.y来显示所有26个,但这只会到目前为止,具体取决于您需要的行数:

p <- ggplot(diamonds, aes_string(x = diamonds$x, y =diamonds$y, color = diamonds$x)) + 
  geom_point()+ facet_grid(rdmGroup~., scales = "free_y") +
  labs(x = "X", y="Y") + theme(panel.spacing.y = unit(0.2, "lines"))