If you're using Rgui under Windows, see FAQ 7.1:

7.1 When using Rgui the output to the console seems to be delayed.
This is deliberate: the console output is buffered ...

(the FAQ says how to turn it off -- it's a menu item).

Vidhu Choudhary wrote:
Hi All,
My R code takes very long time to finish the processing. I want to see at
what stage the script is running. So I wrote some output messages using cat.
But instead of displaying the cat messages at different stages they are
buffered and displayed in the end when entire processing is done.
Can you please suggest how to stop this buffering or some alternative way to
display messages

Thank you
Vidhu

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