Suppress output of a function

Question

I m looking to suppress the output of one command  in this case  the apply function    Is it possible to do this without using sink     I ve found the described solution below  but would like to do this in one line if possible   How to suppress output

User · Answer

you can use  capture output  like below  This allows you to use the data later   log  lt - capture output     test  lt - CensReg SMN cc cc x x y y  nu NULL  type  Normal       test betas

User · Answer

invisible cat  Dataset     dataset  fill   TRUE   invisible cat   Width     width  fill   TRUE   invisible cat   Bin1      bin1interval  fill   TRUE   invisible cat   Bin2      bin2interval  fill   TRUE   invisible cat   Bin3      bin3interval  fill   TRUE     produces output without NULL at the end of the line or on the next line  Dataset   17 19 26 29 31 32 34 45 47 51 52 59 60 62 63 Width   15 33333  Bin1    17 32 33333 Bin2    32 33333 47 66667 Bin3    47 66667 63

User · Answer

R only automatically prints the output of unassigned expressions  so just assign the result of the apply to a variable  and it won t get printed

User · Answer

It isn t clear why you want to do this without sink  but you can wrap any commands in the invisible   function and it will suppress the output   For instance   1 10   prints output invisible 1 10    hides it   Otherwise  you can always combine things into one line with a semicolon and parentheses     sink   dev null          sink

User · Answer

In case anyone s arriving here looking for a solution applicable to RMarkdown  this will suppress all output       r error FALSE  warning FALSE  message FALSE  invisible  capture output      Your code goes here 2   2   etc   etc              The code will run  but the output will not be printed to the HTML document

User · Answer

Making Hadley s comment to an answer  hope to make it better visible   Use of apply family without printing is possible with use of the plyr package  x  lt - 1 2 lapply x  function x  x   1    gt    1     gt   1  2   gt     gt    2     gt   1  3  plyr  l ply x  function x  x   1    Created on 2020-05-19 by the reprex package  v0 3 0

User · Answer

The following function should do what you want exactly   hush function code     sink  NUL     use  dev null in UNIX   tmp   code   sink     return tmp      For example with the function here   foo function      print  BAR      return 42      running  x   hush foo      Will assign 42 to x but will not print  BAR   to STDOUT  Note than in a UNIX OS you will need to replace  NUL  with   dev null

User · Answer

Use the capture output   function  It works very much like a one-off sink   and unlike invisible    it can suppress more than just print messages  Set the file argument to  dev null on UNIX or NUL on windows   For example  considering Dirk s note    gt  invisible cat  Hi n    Hi   gt  capture output  cat  Hi n    file  NUL    gt

[r] Suppress output of a function

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