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Have a look at the v.kcv function in GRASS GIS
(<a class="moz-txt-link-freetext" href="http://wgbis.ces.iisc.ernet.in/grass/gdp/html_grass64/v.kcv.html">http://wgbis.ces.iisc.ernet.in/grass/gdp/html_grass64/v.kcv.html</a>).
This function randomly partition points into test/train sets.
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<div class="moz-cite-prefix">On 11/19/2012 12:40 PM, Olav Peeters
wrote:<br>
</div>
<blockquote
cite="mid:CAHa1ncVNf8uk2PwiW+oupPrsPuVnCK8fWOtUqMEvgyx0bTcZpg@mail.gmail.com"
type="cite">Hi everyone,
<div>for the purpose of speeding up a complex interpolation
(written in single core Fortran-code) we would want to split a
cloud of points (ca. 3 million irregular points) into X number
of parts (eg 20 parts of more or less 150 000 points). Does
anyone know of some QGIS-extension that could do this kind of a
job? </div>
<div><br>
</div>
<div>I was looking at a Saga-gis module ("Shapes - Tools >
Split Shapes Layer Randomly") in the SEXTANTE toolbox. This is
perfect if you want to split shapes into two parts with varying
proportions between the two parts. I can perform this
sequentially to arrive at the desired number of parts, but is
very time consuming if you want to compare the impact on the
system of splitting everything in eg 20 parts versus 15 or 12
or..</div>
<div><br>
</div>
<div>Preferably, a solution should be executable from the
command-line.</div>
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<div>Cheers,</div>
<div>Olav</div>
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