[CWB] CQP command to query by corpus position

[Martin Hammarstedt]

Hi!

Instead of creating a temporary file, you can also read the positions 
from a pipe:

     undump A < "printf '1\n2103\t2103' |";
     cat A;

The "1" on the first line is the total number of rows.

Martin


On 2017-11-23 13:09, Stephen Barrett wrote:
> Hi Stefan.
>
> That's enormously helpful! I experimented with each of the solutions you suggested and found that the third option - writing to a temp file - is ideal for our purposes.
>
> Many thanks indeed.
>
> Stevie
>
>
> -----Original Message-----
> From: cwb-bounces at sslmit.unibo.it [mailto:cwb-bounces at sslmit.unibo.it] On Behalf Of Stefan Evert
> Sent: 21 November 2017 16:13
> To: CWBdev Mailing List <cwb at sslmit.unibo.it>
> Subject: Re: [CWB] CQP command to query by corpus position
>
>
>> Can anyone tell me whether there is a CQP command I can use to get a token at a specific corpus position? If I know from a table of CQP results, for example, that a given token has a cpos of 2103, is there a command to retrieve that token using that integer?
> By far the best solution is to access the indexed data directly through the C-level API (e.g. with the CWB::CL Perl module) or the CQi network interface (if you have a lot of time to write your own client library ;-).
>
> If you really need to do it via CQP, there are two possibilities:
>
> a) You don't care about efficiency and wasting huge amounts of memory:
>
> 	[word = ".*" & _ = 2103];
>
> b) You do care and are working interactively (cqp -e) in the terminal
>
> 	undump A;
> 	1
> 	2103	2103
> 	cat A;
>
> (where you have to type a TAB character between the two 2103's).
>
> c) You want to do the same programmatically
>
> 	1. write some temp file, e.g. /tmp/A.txt with the line "2103\t2103";
>
> 	2. in CQP:
> 		undump A < "/tmp/A.txt";
> 		cat A;
>
> Hope this helps
> Stefan
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