I have an app that I want the user to be able to define the order of fit of 2 variables in a scatterplot that a user also defines. Right now, my attempt at this is proving unsuccessful with the error Error in x - xbar : non-numeric argument to binary operator. I am at a loss as to how to fix this, and any suggestions on how to get this working are appreciated.
ui <- fluidPage(
selectInput(inputId = "x", label="Select x-axis Variable:", choices=as.character(names(mtcars)),selected='mpg', multiple = FALSE),
selectInput(inputId = "y", label="Select y-axis Variable:", choices=as.character(names(mtcars)),selected='hp', multiple = FALSE),
numericInput(inputId = "order", label = "Select Order of fit line", value = 2, min = 1, max = 6, step = 1),
ggvisOutput("plot1")
)
server<-function(input,output,session)
{
vis <- reactive({
xvar <- prop("x", as.symbol(input$x))
yvar <- prop("y", as.symbol(input$y))
mtcars %>%
ggvis(x = xvar, y = yvar) %>%
layer_points() %>%
layer_model_predictions(model = "lm", formula=yvar ~ poly(xvar,input$order))
})
vis %>% bind_shiny("plot1")
}
shinyApp(ui = ui, server = server)
