R help - Dec 2011 - Help! Big problem when using "browser()" to do R debugging?

Hi all,

Could you please help me?

I am having the following weird problem when debugging R programs
using "browser()":

In my function, I've inserted a "browser()" in front of Step 1. My
function has 3 steps and at the end of each step, it will print out
the message "Step i is done"...

However, after I hit <ENTER> when the program stopped before Step 1
and entered into the debugging mode, it not only executed the next
line(i.e. the Step 1), but also all the (many) remaining lines in that
function, as shown below:


Browse[1]>
[1] "Step 1 is done.."
[1] "Step 2 is done.."
[1] "Step 3 is done.."

Then it automatically quited the debugging mode and when I tried to
check the value of "myobj", I've got the following error message:
> names(myobj)
Error: object 'myobj' not found
No suitable frames for recover()

----------------------------------------------------

So my question is: why did one key stroke <ENTER> lead it to execute
all the remaining lines in that function and then "returned" from the
function and quited the debugging mode?

Thanks a lot!

On 11-12-02 8:38 PM, Michael wrote:
> Hi all,
>
> Could you please help me?
>
> I am having the following weird problem when debugging R programs
> using "browser()":
>
> In my function, I've inserted a "browser()" in front of Step
1. My
> function has 3 steps and at the end of each step, it will print out
> the message "Step i is done"...
>
> However, after I hit<ENTER>  when the program stopped before Step 1
> and entered into the debugging mode, it not only executed the next
> line(i.e. the Step 1), but also all the (many) remaining lines in that
> function, as shown below:
>
>
> Browse[1]>
> [1] "Step 1 is done.."
> [1] "Step 2 is done.."
> [1] "Step 3 is done.."
>
> Then it automatically quited the debugging mode and when I tried to
> check the value of "myobj", I've got the following error
message:
>
>> names(myobj)
> Error: object 'myobj' not found
> No suitable frames for recover()
>
> ----------------------------------------------------
>
> So my question is: why did one key stroke<ENTER>  lead it to execute
> all the remaining lines in that function and then "returned" from
the
> function and quited the debugging mode?
See ?browser.

Duncan Murdoch

On Sat, Dec 3, 2011 at 2:38 AM, Michael <comtech.usa at gmail.com>
wrote:
> Hi all,
>
> Could you please help me?
>
> I am having the following weird problem when debugging R programs
> using "browser()":
>
> In my function, I've inserted a "browser()" in front of Step
1. My
> function has 3 steps and at the end of each step, it will print out
> the message "Step i is done"...
>
> However, after I hit <ENTER> when the program stopped before Step 1
> and entered into the debugging mode, it not only executed the next
> line(i.e. the Step 1), but also all the (many) remaining lines in that
> function, as shown below:
>
>
> Browse[1]>
> [1] "Step 1 is done.."
> [1] "Step 2 is done.."
> [1] "Step 3 is done.."
>
> Then it automatically quited the debugging mode and when I tried to
> check the value of "myobj", I've got the following error
message:
>
>> names(myobj)
> Error: object 'myobj' not found
> No suitable frames for recover()
>
> ----------------------------------------------------
>
> So my question is: why did one key stroke <ENTER> lead it to execute
> all the remaining lines in that function and then "returned" from
the
> function and quited the debugging mode?
>
As soon as you get into 'debug' mode, type 'n', hit
<enter>, then you
can simply hit <enter> to evaluate the fun step by step. To exit the
step-by-step, type 'c' and hit enter: this will evaluate the rest of
the function.

Regards
Liviu

> Thanks a lot!
>
> ______________________________________________
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> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide
http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.


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