R: Print Call Stack of Last Error

traceback {base} | R Documentation

## Print Call Stack of Last Error

### Description

`traceback()` prints the call stack of the last error, i.e., the sequence of calls that lead to the error. This is useful when an error occurs with an unidentifiable error message. This stack is stored as a list in `.Traceback`, which `traceback` prints in a user-friendly format.

### Usage

    traceback()

### Value

`traceback()` returns nothing, but prints the deparsed call stack deepest call first. The calls may print on more that one line, and the first line is labelled by the frame number.

### Examples

    foo <- function(x) { print(1); bar(2) }
    bar <- function(x) { x + a.variable.which.does.not.exist }

    foo(2) # gives a strange error
    traceback()
    ## 2: bar(2)
    ## 1: foo(2)
    bar
    ## Ah, this is the culprit ...

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