Sink console output to .txt file from a function

Question

I need to populate a .txt file while running a code with nested functions. I use sink() for this purpose. The output consists of a) text messages, b) dataframe rows. I fail to print dataframes from inside the nested function:

sink("log.txt")

cat("Some message")          # Successfully prints to log.txt
head(some_df)                # Successfully prints to log.txt

some_fun = function(x){
    # ...
    cat("Another message")   # Successfully prints to log.txt
    head(another_df)         # Nothing gets printed to log.txt
    # check that another_df is not empty:
    cat(nrow(another_df))    # Successfully prints to log.txt (>0) 
    # ...
}
some_fun(x=0)

sink()

So what's the right way to do it?

Wrap `print` around `head` like this: `print(head(another_df))` . It should work then.. — sm925, Dec 26 '19 at 16:39
Many thanks @samadhi. I was an idiot and tried much more complex combinations of cat() and print(). — Dmitry D. Onishchenko, Dec 26 '19 at 16:51

score 1 · Accepted Answer · answered Dec 26 '19 at 16:50

1

Wrap a print around head inside your function. Like this:

print(head(another_df))

answered Dec 26 '19 at 16:50

sm925

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Sink console output to .txt file from a function

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