How to Suppress Warnings Globally in an R Script

How to suppress warnings globally in an R Script

You could use

options(warn=-1)

But note that turning off warning messages globally might not be a good idea.

To turn warnings back on, use

options(warn=0)

(or whatever your default is for warn, see this answer)

How to suppress warnings globally in a R package function

You could put the entire body of your function inside a suppressWarnings() block, e.g.

foo <- function(a,b,c) {
  ret_values <- suppressWarnings({
    ## body of the function goes here
  })
  return(ret_values)
}

This is is a hack (among other things, it will make source-level debugging harder), the original options()/on.exit(options(...)) solution is better, but if CRAN doesn't like it you're stuck.

If you just want to prevent a particular function call from issuing a warning (according to your comments above, it's chol() in your case), then suppressWarnings(chol(...)) should work, and should be better than the brute-force solution suggested above (based on this commit it looks like you've already implemented this ...)

It would be even better to be able to trap only specific warnings: e.g. sqrt(-1) and sqrt(10000000000000000000000L) return different warnings, one might want to trap the "NaNs produced" warning and not the "non-integer value qualified with L" warning. Unfortunately for reasons explained on the r-devel mailing list in 2012 (i.e., warning messages may be translated so you can't use text-matching on the message), there's (AFAIK) no reliable way to do this.

How to temporarily suppress warnings in R

Use suppressWarnings():

suppressWarnings(foo())

Turn off warnings in R Notebook

While you can turn off warnings globally, it's usually not a good idea. Fortunately, there are ways to suppress output for specific instances.

Some alternatives that work in a Jupyter environment are:

# suppress conflict warnings at package load
library(dplyr, warn.conflicts=FALSE)

# suppress startup messages at package load
suppressPackageStartupMessages(library(tidyverse))

# suppress warnings
suppressWarnings( as.numeric(c('0', '1', '2', 'three')) )

# suppress messages
suppressMessages(df %>% group_by(location) %>% summarize(revenue))

How to suppress warning messages when loading a library?

These are not messages but warnings. You can do:

suppressWarnings(library(RODBC))

or

suppressWarnings(suppressMessages(library(RODBC)))

to suppress both types.

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