R programming, Debugging in R

1. R programming
Debugging in R
Faisal Imran
Rizwan Ali

2. Following are the debugging Flow
 Debug, browser and trace
R programming (Debugging in R)
Overview

3.  debug() works by marking functions for debugging.
 When R starts to evaluate such a function, the evaluator
automatically breaks to the debugger.
 Use debug(fun) to mark a function for debugging.
 all undebug(fun) to remove the debugging flag from a
function
R programming (Debugging in R)
debug()

4.  browser() function in R's base package allows you to single
step through the execution of an R function.
 You can view and change objects during execution
R programming (Debugging in R)
browser()

5.  The trace() function modifies a function to allow debug code
to be temporarily inserted
 A call to trace allows you to insert debugging code
 A call to untrace cancels the tracing
 Specified methods can be traced the same way, without
tracing all calls to the function
 Tracing can be temporarily turned on or off globally by
calling tracingState.
R programming (Debugging in R)
trace()

6. R programming (Debugging in R)

7. R programming (Debugging in R)

8. R programming (Debugging in R)

9. R programming (Debugging in R)

10. R programming (Debugging in R)

11. R programming (Debugging in R)
Thank you