R help - Jul 2014 - dplyr problem in shiny

Dear All,

I am trying to run simple code:


*UI.R*

library(shiny)

shinyUI(fluidPage(


  titlePanel("Old Faithful Geyser Data"),

  sidebarLayout(
    sidebarPanel(
      selectInput("gb","gb",names(data))
      ,
      selectInput("var","var",names(data))
      ),

    # Show a plot of the generated distribution
    mainPanel(
      plotOutput("distPlot")
    )
  )
))


*SERVER.R *

library(shiny)
library(ggplot2)
library(dplyr)
library(testthat)
load("/home/void/PISA/data.rda")
shinyServer(function(input, output) {


  output$distPlot <- renderPlot({
    df1<-group_by(data,input$gb)
    df2<-summarise(df1,ov=mean(input$var,na.rm=T))
    hist(df2[,"ov"])
  })
})

but I've  received an error:

Listening on http://127.0.0.1:6721

Warning in mean.default("CNT", na.rm = T) :

  argument is not numeric or logical: returning NA

Error in hist.default(df2[, "ov"]) : invalid number of
'breaks'

Warning in mean.default("PV4MATH", na.rm = T) :

  argument is not numeric or logical: returning NA

Error in hist.default(df2[, "ov"]) : invalid number of
'breaks'


I've checked that input$gb and input$var returns "CNT"... but
dplyr expects
CNT...

Do you have any idea how to deal with this problem?

Thanks,
D

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