"Warning in output$name <- renderPlot({ : Coercing LHS to a list" when using caterplot from mcmcplot

[Brad]

I have data coming from JAGS that will generate a nice caterplot via pdf() and png(), but does not run under shiny-server's renderPlot. That throws a warning "Coercing LHS to a list" and does not create a plot for shiny.

This is on spark.rstudio.org, so I don't know if that has anything to do with it. But like I said, I can use that instance of shiny-server to call png() and pdf() without issue.

This works:

<snip>

  png("AdjScoresPlot.png", width=2000, height=1600)

  caterplot(scorematrix, cex.labels=0.25, main="Adjusted Scores",

             xlab="Adjusted Score", ylab="Student Name")

  dev.off()

</snip>

This does not work:

<snip>

   output$fancyPlot <- renderPlot({  

   caterplot(scorematrix, cex.labels=0.25, main="Adjusted Scores",

             xlab="Adjusted Score", ylab="Student Name")

   )}

</snip>

Any idea what's going on?

Best,

Brad

[Brad]

Just figured it out and got it working. There was a namespace collision with the snippet above this code that overwrote output (okay in R; not so much in shiny).

Once I got that taken care of, shiny drew the plot as expected (as a png).

Thanks for a great tool!

Best,

Brad