browser {base} | R Documentation

## Environment Browser

### Description

Interrupt the execution of an expression and allow the inspection of the environment where `browser` was called from.

### Usage

    browser()

### Details

A call to `browser` causes a pause in the execution of the current expression and runs a copy of the R interpreter which has access to variables local to the environment where the call took place.

Local variables can be listed with `ls`, and manipulated with R expressions typed to this sub-interpreter. The sub-interpreter can be exited by typing `c`. Execution then resumes at the statement following the call to `browser`.

Typing `n` causes the step-through-debugger, to start and it is possible to step through the remainder of the function one line at a time.

Typing `Q` quits the current execution and returns you to the top-level prompt.

### References

Becker, R. A., Chambers, J. M. and Wilks, A. R. (1988) The New S Language. Wadsworth & Brooks/Cole.

Chambers, J. M. (1998) Programming with Data. A Guide to the S Language. Springer.

### See Also

`debug`, and `traceback` for the stack on error.

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