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mlr nest example at cookbook

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John Kerl 2017-03-12 21:32:44 -04:00
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8
doc/content-for-cookbook.html
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@ -146,6 +146,14 @@ POKI_RUN_COMMAND_TOLERATING_ERROR{{mlr --csv put '$reachable = asserting_string(
POKI_INCLUDE_ESCAPED(data/nested.tsv)HERE
<p/> The simplest option is to use <a href="reference-verbs.html#nest"><tt>mlr nest</tt></a>:
POKI_RUN_COMMAND{{mlr --tsv nest --explode --values --across-records -f b --nested-fs : data/nested.tsv}}HERE
POKI_RUN_COMMAND{{mlr --tsv nest --explode --values --across-fields -f b --nested-fs : data/nested.tsv}}HERE
<p/> While <tt>mlr nest</tt> is simplest, let&rsquo;s also take a look at a few ways to do this using the
<tt>put</tt> DSL.
<p/> One option to split out the colon-delimited values in the <tt>b</tt>
column is to use <tt>splitnv</tt> to create an integer-indexed map and loop
over it, adding new fields to the current record:

30
doc/cookbook.html
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@ -633,6 +633,36 @@ s u:v:w
</div>
<p/>
<p/> The simplest option is to use <a href="reference-verbs.html#nest"><tt>mlr nest</tt></a>:
<p/>
<div class="pokipanel">
<pre>
$ mlr --tsv nest --explode --values --across-records -f b --nested-fs : data/nested.tsv
a b
x z
s u
s v
s w
</pre>
</div>
<p/>
<p/>
<div class="pokipanel">
<pre>
$ mlr --tsv nest --explode --values --across-fields -f b --nested-fs : data/nested.tsv
a b_1
x z
a b_1 b_2 b_3
s u v w
</pre>
</div>
<p/>
<p/> While <tt>mlr nest</tt> is simplest, let&rsquo;s also take a look at a few ways to do this using the
<tt>put</tt> DSL.
<p/> One option to split out the colon-delimited values in the <tt>b</tt>
column is to use <tt>splitnv</tt> to create an integer-indexed map and loop
over it, adding new fields to the current record: