On Thu, Jun 17, 2010 at 10:50 AM, Barry Rowlingson
<b.rowling...@lancaster.ac.uk> wrote:
> On Thu, Jun 17, 2010 at 3:33 PM, Doran, Harold <hdo...@air.org> wrote:
>> I have a function that is an iterative process for estimating some MLEs. I
>> want to print some progress to screen as the process iterates. I would like
>> to try and line things up nicely in the R window, but am not sure the best
>> way to do this. Below is a toy example. Suppose I want the value of 10 to be
>> just below "iteration" and the value of -1234 to be just below 'Log
>> Likelihood'.
>
> Sure you just dont want to use the progress bar functions from the
> plyr package:
>
> ?plyr::create_progress_bar
>
> another example of things being in the wrong package....
If you want to stick with a text display you can use the sprintf
function to format the strings that you print
> cat('Iteration Log Likelihood\n', sprintf("%8d%20g\n", 10, -1234))
Iteration Log Likelihood
10 -1234
I would avoid the tab character as you can't count on the displays of
tabs to be consistent. You may also want to change the display of the
log-likelihood to be a fixed number of decimal places rather than a
general format for floating point numbers, which can switch into the
"e" notation for very large or very small numbers.
> cat('Iteration Log Likelihood\n', sprintf("%8d%20.4f\n", 10, -1234))
Iteration Log Likelihood
10 -1234.0000
The format of the format strings is another "little language" to learn
but it is a very powerful mechanism.
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