Suppress warning message in R console of shiny

Question

We developed a shiny application. It was showing some warning messages, we never bothered it, because the application is working fine. But, we can\'t distribute the applicat

Answer 1

Insert this in your ui script.

tags$style(type="text/css",
         ".shiny-output-error { visibility: hidden; }",
         ".shiny-output-error:before { visibility: hidden; }"
)

Answer 2

Wrapping suppressWarnings around your code should work. See ?suppressWarnings. You need to do something like:

atest <- function(n) {warning("a warning"); return(n+1)}
atest(1)
#[1] 2
#Warning message:
#In atest(2) : a warning

suppressWarnings(atest(1))
#[1] 2

But I guess that the better solution is to actually deal with the warning and not just ignore it.

Answer 3

You actually have two suppress functions via R that work differently for you:

suppressMessages() evaluates its expression in a context that ignores all ‘simple’ diagnostic messages." See ?suppressMessages.

• suppressWarnings() evaluates its expression in a context that ignores all warnings. See ?suppressWarnings.

Examples:

f <- function(a) { a ; warning("This is a warning") ; message("This is a message not a warning")}

> f(1)
This is a message not a warning
Warning message:
In f(1) : This is a warning

> suppressWarnings(f(1))
This is a message not a warning

> suppressMessages(f(1))
Warning message:
In f(1) : This is a warning