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Re: getting case count via PSPP::Perl

From: Ben Pfaff
Subject: Re: getting case count via PSPP::Perl
Date: Mon, 23 May 2011 10:51:51 -0700
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/23.2 (gnu/linux)

It would be ideal if you would file this as a "wishlist" bug in
the tracker at  That
way the request will not get lost.

Rob Messer <address@hidden> writes:

> John,
> Ok, that is good to know.  So I guess consider this a feature
> request to add that to some future release.  If the method
> sometimes returns undef because the file header doesn't have
> the info that then is reasonable enough, but at least we could
> show progress in most cases.  Thank you,
> Rob
> On May 22, 2011, at 1:20 AM, John Darrington wrote:
>> It should be very straightforward.   Most .sav files contain a header field 
>> indicating the number of cases.  However, occasionally we've encountered 
>> files
>> which don't have this field.  So the perl program would have to be prepared 
>> to
>> handle this case.
>> J'
>> On Fri, May 20, 2011 at 11:16:26AM -0700, Rob Messer wrote:
>>     We have been using the PSPP::Perl interface to read data from .sav files 
>> into our database, and it works very well for that purpose.
>>     Sometimes the files we read are rather large, and so it takes some time 
>> to load the data.  We like to be able to show progress to the user who is 
>> loading their data, so we need to know the total number of records to be 
>> loaded.  But right now, there doesn't appear to be any way to get the total 
>> number of cases other than scanning through all the records.  Is there any 
>> way to add a method to the Perl API so that we could do something like this:
>>     my $pspp = PSPP::Reader->open($file);
>>     my $case_count = $pspp->get_num_cases(); 
>>     # then load cases to database and show percent complete at various 
>> points...
>>     Thanks,
>>     Rob
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Ben Pfaff

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