I know you can access the R Std Output and R Error Output, but the messages are not being printer in real time, only after script as a whole is evaluated. Is there any way to enable "on the fly" messaging?
I have a rather long loop that I execute in R node, and would love to see progress with some check point printouts.
I don't think that this is possible at the moment. You could store all the warnings/errors in a separate dataframe and print this to the KNIME console using a Java Snippet. However, this will not work in real time. The R Snippet works in batch mode, sending all the data to R and returning the full results once R is finished. I.e., no intermediate results are transmitted.
Would it be possible for you to to recreate the R loop in KNIME, so that each iteration can deliver a message rather than have the loop completely in R?