Strange error with dplyr in Shiny app

[ArjunaCap]

This is fine from the command line:

data <- mtcars %>% select(cyl, disp, hp)  %>% group_by(cyl) %>% summarise (disp = sum(disp), n = n())

but embedded in the following toy app, it generates a subscript out of bounds error, and seems to be generated from group_by:

server.R

library(shiny)

library(dplyr)

library(ggplot2)

data <- mtcars %>% select(cyl, disp, hp)  %>% group_by(cyl) %>% summarise (disp = sum(disp), n = n())

shinyServer(function(input, output) {

  output$table <- renderTable({

 data

  })

})

  

ui.R

shinyUI(

  fluidPage(

    fluidRow(

      tableOutput("table")

    )    

  )  

)

Any ideas of what's happening?

[john crowell]

Same error for me with different data, but the exact same results, and I traced it to the group_by() call. I believe a recent package update broke this since the same code was working for me about 10 days ago.

[JP]

I am also getting an new error with dplyr and shiny. I am only using `filter` and `%>%`.  It was not a problem a few days ago. I am getting an `Error: incorrect length(0) expecting 28255` error when I am filtering some data. 

[Michael Cawthon]

One clarification:  It seems related to the use of RenderTable.  Eg, renderPrint in the following code works:

data <- mtcars %>%
        select(cyl, disp, hp)  %>%
        group_by(cyl) %>%
        summarise (disp = sum(disp), n = n())   

server <- (function(input, output) {
           output$table <- renderPrint({ data })
           })

ui <- shinyUI(
      fluidPage(  verbatimTextOutput("table")  ) 
      )

shinyApp(ui = ui, server = server)

On 10/14/14, 11:22 AM, JP wrote:

I am also getting an new error with dplyr and shiny. I am only using `filter` and `%>%`.  It was not a problem a few days ago. I am getting an `Error: incorrect length(0) expecting 28255` error when I am filtering some data. 

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[JP]

Actually,

 on further investigation my problem was that a different package was not playing well with dplyr and it was not a shiny issue at all

[George Yang]

JP - i am having the same issue, which package was causing the issues for you?  Thanks