Skipping error in for-loop

Question

I am doing a for loop for generating 180 graphs for my 6000 X 180 matrix  1 graph per column   some of the data don t fit my criteria and i get the error        Error in cut default x  breaks   bigbreak  include lowest   T    breaks  are not unique      I am fine with the error  I want the program to continue running the for loop  and give me a list of what columns made this error  as a variable containing column names maybe     Here s my command   for  v in 2 180       mypath file path  C     file1    paste  graph  names mydata columnname      pdf   sep  -         pdf file mypath      mytitle   paste  anything       myplotfunction mydata  columnnumber      this function is defined previously in the program     dev off       Note  I have found numerous posts about tryCatch and none of them worked for me  or at least i couldn t apply the function correctly   The help file wasn t very helpful as well   Help would be appreciated  Thanks

User · Answer

Instead of catching the error  wouldn t it be possible to test in or before the myplotfunction    function first if the error will occur  i e  if the breaks are unique  and only plot it for those cases where it won t appear

User · Answer

Here s a simple way for  i in 1 10         skip to next  lt - FALSE        Note that print b  fails since b doesn t exist      tryCatch print b   error   function e    skip to next  lt  lt - TRUE        if skip to next    next           Note that the loop completes all 10 iterations  despite errors  You can obviously replace print b  with any code you want  You can also wrap many lines of code in   and   if you have more than one line of code inside the tryCatch

User · Answer

One  dirty  way to do it is to use tryCatch with an empty function for error handling  For example  the following code raises an error and breaks the loop    for  i in 1 10        print i      if  i  7  stop  Urgh  the iphone is in the blender         1  1  1  2  1  3  1  4  1  5  1  6  1  7 Erreur   Urgh  the iphone is in the blender     But you can wrap your instructions into a tryCatch with an error handling function that does nothing  for example    for  i in 1 10      tryCatch       print i      if  i  7  stop  Urgh  the iphone is in the blender          error function e         1  1  1  2  1  3  1  4  1  5  1  6  1  7  1  8  1  9  1  10   But I think you should at least print the error message to know if something bad happened while letting your code continue to run    for  i in 1 10      tryCatch       print i      if  i  7  stop  Urgh  the iphone is in the blender          error function e  cat  ERROR    conditionMessage e     n         1  1  1  2  1  3  1  4  1  5  1  6  1  7 ERROR   Urgh  the iphone is in the blender     1  8  1  9  1  10   EDIT   So to apply tryCatch in your case would be something like    for  v in 2 180       tryCatch           mypath file path  C     file1    paste  graph  names mydata columnname      pdf   sep  -             pdf file mypath          mytitle   paste  anything           myplotfunction mydata  columnnumber      this function is defined previously in the program         dev off          error function e  cat  ERROR    conditionMessage e     n

[r] Skipping error in for-loop

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