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POR Shiny: not sure why ggplot is failing
 

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  1. POR Shiny: not sure why ggplot is failing
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    <p>Shiny newbie here. </p> <p>I am trying to write a R shiny script, and one of things I want to do is generate a histogram of the number of ad views for a given day and a given advertiser across different regions. </p> <p>My table is has the following columns (with sample data): </p> <pre><code>Date Impressions Advertiser Factor 1 DMA 2/19 22789 McDonalds Cheap Los Angeles 2/17 15002 Regal Cinem Luxury New York 2/20 12345 McDonalds Cheap D.C. </code></pre> <p>My desired output on the UI tab is something like this with ggplot</p> <pre><code>ggplot(df2, aes(x=DMA, y=Impressions, fill=DMA)) +geom_histogram() </code></pre> <p>and should looks like this</p> <p><img src="https://i.stack.imgur.com/oLBMM.png" alt="enter image description here"></p> <p>However, I am getting an error</p> <pre><code>Error: object 'DMA' not found </code></pre> <p>when I am basically pasting the same formula into R Shiny. My code is as follows</p> <p>server.R</p> <pre><code>library(shiny) library(ggplot2) df&lt;- na.omit(read.csv("data.csv", fill= TRUE, nrows= 3000000)) shinyServer(function(input, output){ df2&lt;- reactive({df[df$Date==input$date &amp; df$Advertiser==input$name, ]}) #FIXME why is this plot not printing output$plot1&lt;- renderPlot({ print(ggplot(df2, aes(x=DMA, y=Impressions, fill=DMA)) +geom_histogram()) }) #end of server brackets }) </code></pre> <p>ui.R</p> <pre><code>library(shiny) df&lt;- na.omit(read.csv("data.csv", fill= TRUE, nrows= 3000000)) daterange&lt;- unique(df$Date) names &lt;- unique(df$Advertiser) shinyUI(pageWithSidebar( #Title of Application headerPanel("Advertisement"), sidebarPanel( selectInput("date", "Date:", choices= daterange), selectInput("name", "Partner", choices= names) ), mainPanel( tabsetPanel( tabPanel("Plot1", plotOutput("plot1")) ) ) #end of UI brackets )) </code></pre> <p>Everything else works, including the tabs. But this plot is not showing up. </p> <p>UPDATE: THANKS, GGplot now works by wrapping the print() statement around it. However, a new issue arises where a variable cannot be found. </p>
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    1. USGreen Demon
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    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
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      1. POR Shiny: not sure why ggplot is failing
      1. This table or related slice is empty.
      1. VTUpMod
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      1. POR Shiny: not sure why ggplot is failing
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      1. POR Shiny: not sure why ggplot is failing
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    1. COAre you saying that the plot works normally, but not when in Shiny? Try putting your plot in `print()` e.g. `p <- ggplot(...) + geom_histogram(...); print(p)`.
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      1. USMadScone
    2. COthanks. ggplot works now, but its not plotting due to "Object DMA not found"
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    3. COIs `DMA` definitely a column in `df2`?
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      1. POR Shiny: not sure why ggplot is failing
      1. USMadScone
 

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