Message from each loop iteration during quarto render

Question

I am using a loop in R in a quarto document

When I render the quarto document via Rstudio, I would like to see in the background jobs how far in the loop the process is.

When I work interactively, this works:

species <- iris$Species |> unique()

for(i in species) {
  message(i)
  Sys.sleep(2)
}

However, when rendering, no message appears in the Background Jobs pane. I have tried with print() and cat() as well.

Is there a workaround to this?

Seems it's related: github.com/quarto-dev/quarto-cli/discussions/7443. Far awarie from PC at the moment to check it, but you might try. — Grzegorz Sapijaszko
– Grzegorz Sapijaszko, Commented Nov 8, 2024 at 15:40

Steen Harsted · Accepted Answer · 2024-11-10 20:18:41Z

1

The solution is to add #| message: !expr NA in the quarto code block.

#| message: !expr NA
species <- iris$Species |> unique()

for(i in species) {
  message(i)
  Sys.sleep(2)
}

answered Nov 10, 2024 at 20:18

Steen Harsted

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