[Perldl] Large Number Support?

chm devel.chm.01 at gmail.com
Fri Feb 10 01:32:31 HST 2012


Hi Cliff-

Do you have a program showing the problem
with some input data?  What data type are
the piddles?  (help $mypdl in the shell)

As for the output from the 'p' command
for a piddle, you're looking at some format
conversion of some pdl type and not the
raw data.  See PDL::Core for info on the
current format.

Also, you might see if the example you
show for the PDL shell gives the same
output for the debugger session.

--Chris

P.S. Could you please wrap your text to
72 characters so that the list archives
are readable as paragraphs.  I.e., for
this post:

  http://mailman.jach.hawaii.edu/pipermail/perldl/2012-February/006432.html

There appear to be problems with mac mail
that result in this happening.  No solution
other than hand folding/wrapping was found.


On 2/9/2012 10:49 PM, Clifford Sobchuk wrote:
>
> Hi folks,
>
> I ran into a problem - or an effect, that I don't understand. There
> seems to be a number that is too big to be displayed. See the
> following code:
>
> pdl>  p 2**40 1099511627776
>
> pdl>  p 2**32*1.00001 4295010245.67296
>
> pdl>  p 2**36*1.00001 68720163930.7674
>
> pdl>  p 2**38*1.00001 274880655723.069
>
> My problem is that I am using a serialized value for the date and
> time - to millisecond precision. So the following represents :
> YYYYMMDDHHMMSS.msmsms
>
> DB<33>  p ${$myData{MC800BTS1494}{1}{1}{time}}[0] 20120206201813.220
>
> DB<34>  p ${$myData{MC800BTS1494}{1}{1}{time}}[1] 20120206201813.320
>
> DB<35>  p ${$myData{MC800BTS1494}{1}{1}{time}}[2] 20120206201813.420
>
> DB<36>  p ${$myData{MC800BTS1494}{1}{1}{time}}[4] 20120206201813.620
>
> You'll notice that there are two more digits displayed when they are
> in Perl but after I convert them into a PDL, I lose the last two
> digits. I didn't think that this was considered a BigFloat?
>
> Any thoughts. Thanks,
>
>
> CLIFF SOBCHUK Ericsson Core RF Engineering Calgary, AB, Canada Phone
> 613-667-1974  ECN 8109 x71974 Mobile 403-819-9233
> clifford.sobchuk at ericsson.com<mailto:clifford.sobchuk at ericsson.com>
> yahoo: sobchuk http://www.ericsson.com/
>
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