How to choose between histogram and nothing in sidebarPanel? - r

Question

Let's consider my very basic application :
Created by code :
Server
library(shiny) # Load shiny package
start <- as.Date("2013-01-01")
end <- as.Date("2016-10-01")
#Apple stock
getSymbols("AAPL", src = "yahoo", from = start, to = end)
apple <- AAPL$AAPL.Close
#Gold
getSymbols('GOLD', src = 'yahoo', from = start, to = end)
gold <- GOLD$GOLD.Close
#S&P500
getSymbols('^GSPC', src = 'yahoo', from = start, to = end)
sp <- as.numeric(`GSPC`[,4])
#Microsoft
getSymbols('MSFT', src = 'yahoo', from = start, to = end)
msft <- MSFT$MSFT.Close
stock.frame <- data.frame(apple, gold, msft, sp)
colnames(stock.frame) <- c('apple', 'gold', 'msft', 'sp')
shinyServer(
function(input, output) {
output$myhist <- renderPlot({
colm <- as.numeric(input$var)
hist(stock.frame[, colm], col = input$colour, xlim = c(min(stock.frame[, colm]), max(stock.frame[, colm])), main = "Histogram of stock dataset", breaks = seq(min(stock.frame[, colm]), max(stock.frame[, colm]), l = input$bin + 1), xlab = names(stock.frame[colm]))
})
}
)
UI
library(shiny) # load the shiny package
# Define UI for application
shinyUI(fluidPage(
# Header or title Panel
titlePanel(h4('Demostration of the renderPlot() - A Histogram with stock dataset', align = "center")),
# Sidebar panel
sidebarPanel(
selectInput("var", label = "1. Select the quantitative Variable",
choices = c("Apple" = 1, "Gold" = 2, "S&P" = 3, "BTC"=4),
selected = 3),
sliderInput("bin", "2. Select the number of histogram BINs by using the slider below", min=5, max=50, value=15),
radioButtons("colour", label = "3. Select the color of histogram",
choices = c("Green", "Red",
"Yellow"), selected = "Green")
),
# Main Panel
mainPanel(
textOutput("text1"),
textOutput("text2"),
textOutput("text3"),
plotOutput("myhist")
)
)
)
I want to have another sidebarPanel (analogous to '1. Select the quantitative Variable') in which I can specify if I want 'Histogram' or 'nothing'. If histogram was choosed then I should have same thing as above. When "nothing' was choosed I should see blank page. Do you know how it can be performed ?
EDIT
I added radiobutton as #r2evans suggested. It now look's in the way following :
shinyUI(fluidPage(
radioButtons("rb", "Plot type:", choiceNames = c("Histogram", "Nothing")),
# Header or title Panel
titlePanel(h4('Demostration of the renderPlot() - A Histogram with stock dataset', align = "center")),
# Sidebar panel
sidebarPanel(
selectInput("var", label = "1. Select the quantitative Variable",
choices = c("Apple" = 1, "Gold" = 2, "S&P" = 3, "BTC"=4),
selected = 3),
sliderInput("bin", "2. Select the number of histogram BINs by using the slider below", min=5, max=50, value=15),
radioButtons("colour", label = "3. Select the color of histogram",
choices = c("Green", "Red",
"Yellow"), selected = "Green")
),
# Main Panel
mainPanel(
textOutput("text1"),
textOutput("text2"),
textOutput("text3"),
plotOutput("myhist")
)
)
)
However after running 'Run App' i see error :
Error in normalizeChoicesArgs: Please specify a non-empty vector for `choices` (or, alternatively, for both `choiceNames` AND `choiceValues`).
81: stop
80: normalizeChoicesArgs
79: radioButtons
Have I done something wrong ?

Answer 1

Perhaps you are looking for a solution like this
library(shiny)
library(quantmod)
start <- as.Date("2013-01-01")
end <- as.Date("2016-10-01")
#Apple stock
getSymbols("AAPL", src = "yahoo", from = start, to = end)
apple <- AAPL$AAPL.Close
#Gold
getSymbols('GOLD', src = 'yahoo', from = start, to = end)
gold <- GOLD$GOLD.Close
#S&P500
getSymbols('^GSPC', src = 'yahoo', from = start, to = end)
sp <- as.numeric(`GSPC`[,4])
#Microsoft
getSymbols('MSFT', src = 'yahoo', from = start, to = end)
msft <- MSFT$MSFT.Close
stock.frame <- data.frame(apple, gold, msft, sp)
colnames(stock.frame) <- c('apple', 'gold', 'msft', 'sp')
cmat <- cor(stock.frame)
### plot_ly(z = cmat, type = "heatmap")
### Define UI for application
ui <- fluidPage(
# Header or title Panel
titlePanel(h4('Demostration of the renderPlot() - A Histogram with stock dataset', align = "center")),
# Sidebar panel
sidebarPanel(
selectInput("var", label = "1. Select the quantitative Variable",
choices = c("Apple" = 1, "Gold" = 2, "S&P" = 3, "BTC"=4),
selected = 3),
sliderInput("bin", "2. Select the number of histogram BINs by using the slider below", min=5, max=50, value=15),
radioButtons("graphtype", label = "Select Type of Graph",
choices = c("Heatmap", "Histogram", "DataTable"), selected = "Heatmap"),
conditionalPanel(
condition = "input.graphtype == 'Histogram' ",
radioButtons("colour", label = "3. Select the color of histogram",
choices = c("Green", "Red", "Yellow"), selected = "Green")
)
),
# Main Panel
mainPanel(
textOutput("text1"),
textOutput("text2"),
textOutput("text3"),
conditionalPanel(
condition = "input.graphtype == 'Heatmap' ", plotlyOutput("heatmap", width = "100%", height="600px")
),
conditionalPanel(
condition = "input.graphtype == 'Histogram' ", plotOutput("myhist")
),
conditionalPanel(
condition = "input.graphtype == 'DataTable' ", DTOutput("tb1")
)
)
)
server <- function(input, output) {
output$myhist <- renderPlot({
colm <- as.numeric(input$var)
hist(stock.frame[, colm], col = input$colour, xlim = c(min(stock.frame[, colm]), max(stock.frame[, colm])), main = "Histogram of stock dataset", breaks = seq(min(stock.frame[, colm]), max(stock.frame[, colm]), l = input$bin + 1), xlab = names(stock.frame[colm]))
})
output$heatmap <- renderPlotly({plot_ly(x = colnames(stock.frame), y = colnames(stock.frame), z = cmat, type = "heatmap") %>%
layout(
xaxis = list(title=colnames(stock.frame)),
yaxis = list(title="ts")
)
})
output$tb1 <- renderDT(stock.frame)
}
# Run the application
shinyApp(ui = ui, server = server)