Bioequivalence and Bioavailability Forum

tryCatch in R [Software]

posted by ElMaestro  – Denmark, 2022-09-01 12:33 (1371 d 16:17 ago) – Posting: # 23247
Views: 6,675

Hi mittyri,

❝ maybe I misunderstood your goal but won't

❝ tryCatch(


❝   {   
❝     a <- system(command="hamburger", intern = T)
❝   }, 
❝   error = function(cond) {
❝     a <<- cond
❝   }


❝ )

❝ work?

Thank you for the proposal.
It works with the hamburger example but not when I invoke gcc :

> tryCatch(
+   {   
+     a <- system("gcc -O2 -Wall Tester301.c -o T301", intern=T)
+   },
+   error = function(cond) {
+     a <<- cond
+   }
+ )
cc1: fatal error: Tester301.c: No such file or directory
compilation terminated.
Warning message:
In system("gcc -O2 -Wall Tester301.c -o T301", intern = T) :
  running command 'gcc -O2 -Wall Tester301.c -o T301' had status 1
> a
character(0)
attr(,"status")
[1] 1

So given the difference in behaviour I have a feeling this is about stderr and stdout. My own understanding of these concepts is rudimentary, to say the least.
R must be listening on both channels, so to say. Need to play a little more around with the ">" and ">2" commandline switches.

Complete thread:

• system and system2 in R ElMaestro 2022-08-29 22:29 
  • system and system2 in R Helmut 2022-08-30 01:10
    • system and system2 in R ElMaestro 2022-08-30 08:52
      • system and system2 in R Helmut 2022-08-30 11:25
    • processx package mittyri 2022-08-31 17:50
  • tryCatch in R mittyri 2022-08-31 17:53
    • tryCatch in RElMaestro 2022-09-01 10:33
      • tryCatch in R mittyri 2022-09-01 14:07