R help - Oct 2010 - R step-by-step execution

Hello!
I wouldl ike to ask you if R supports step by step execution.  I have written 
some nested loops and  I would like to check on every  step what are the values 
of some variables. Printing all the variables  just creates a really big output 
of numbers.

Could you please give some debugging tutorial that included the aforementioned 
functionalities?


|Moreover can you please tell me how I can concatenate variables and strings so 
to print some debugging messages /
"The value of x is " + x + " and the value of y is " +y.


Best Regards
Alex


      
	[[alternative HTML version deleted]]

Hello

On Fri, Oct 22, 2010 at 11:33 AM, Alaios <alaios at yahoo.com>
wrote:
> I wouldl ike to ask you if R supports step by step execution. ?I have
written
> some nested loops and ?I would like to check on every ?step what are the
values
> of some variables.
>
> fortune('browser')
My solution when I run into mysteries like this is to put 'browser()' in
the
function just before or after the line of interest. The magnitude and direction
of my stupidity usually become clear quickly.
   -- Patrick Burns
      R-help (February 2006)


Then check the help page for related functions. Regards
Liviu


> Printing all the variables ?just creates a really big output
> of numbers.
>
> Could you please give some debugging tutorial that included the
aforementioned
> functionalities?
>
>
> |Moreover can you please tell me how I can concatenate variables and
strings so
> to print some debugging messages /
> "The value of x is " + x + " and the value of y is "
+y.
>
>
> Best Regards
> Alex
>
>
>
> ? ? ? ?[[alternative HTML version deleted]]
>
> ______________________________________________
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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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Alaios <alaios at yahoo.com> writes:
>  
> Hello!
> I wouldl ike to ask you if R supports step by step execution.  I have
written
> some nested loops and  I would like to check on every  step what are the
values
> of some variables. Printing all the variables  just creates a really big
output
> of numbers.
>
> Could you please give some debugging tutorial that included the
aforementioned
> functionalities?
>
At your command prompt type: help(browser)

Alternatively you can use the debug library:
http://cran.r-project.org/web/packages/debug/index.html
> |Moreover can you please tell me how I can concatenate variables and
strings so
> to print some debugging messages /
> "The value of x is " + x + " and the value of y is "
+y.
>
message <- paste("The value of x is ",x," and the value of y
is ",y,sep="")
print(message)

-- 
aleblanc

On Oct 22, 2010, alais wrote:
>> |Moreover can you please tell me how I can concatenate variables  
>> and strings so
>> to print some debugging messages /
>> "The value of x is " + x + " and the value of y is
" +y.
Commas, not "+""

cat("The value of x is ", x , " and the value of y is " , y)

-- 

David Winsemius, MD
West Hartford, CT