Re: [xsl] How to Do Random "Shuffle"?

["Eliot Kimber ekimber@xxxxxxxxxxxx" <xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx>]

The FXSL stuff looks interesting--I will try to understand the random
number algorithms at some point.

As it's written for XSLT 1, would it be possible to re-implement using
XSLT 2 and therefore remove the implementation-specific stuff?

Cheers,

Eliot
bbbbb
Eliot Kimber, Owner
Contrext, LLC
http://contrext.com




On 9/13/14, 11:40 AM, "Dimitre Novatchev dnovatchev@xxxxxxxxx"
<xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx> wrote:

>This can be done even with XSLT 1.0:
>
>http://fxsl.sourceforge.net/articles/Random/Casting%20the%20Dice%20with%20
>FXSL-htm.htm
>
>More specifically, use the FXSL 1 stylesheet module randomList.xsl
>
>Here is an existing test (demo):
>
>When this transformation (testRandomList.xsl):
>
><xsl:stylesheet version="1.0"
> xmlns:xsl="http://www.w3.org/1999/XSL/Transform";
> xmlns:ext="http://exslt.org/common";
> xmlns:f="http://fxsl.sf.net/";
> xmlns:mySquare="f:mySquare"
> xmlns:myDouble="f:myDouble"
> exclude-result-prefixes="xsl f ext mySquare myDouble"
> >
>
>  <xsl:import href="randomList.xsl"/>
>
>  <xsl:output omit-xml-declaration="yes" indent="yes"/>
>   <!-- This transformation must be applied to:
>        numList.xml
>     -->
>
>  <mySquare:mySquare/>
>  <myDouble:myDouble/>
>
>  <xsl:template match="/">
>
>    <xsl:variable name="vrtfRands">
>      <xsl:call-template name="randomSequence">
>        <xsl:with-param name="pLength" select="100"/>
>      </xsl:call-template>
>    </xsl:variable>
>
>    Random Recursive Index (dScale (randomSequence 100)):
>
>    <xsl:call-template name="_dScale">
>      <xsl:with-param name="pRandSeq"
>          select="ext:node-set($vrtfRands)/*"/>
>    </xsl:call-template>
>
>    Random Recursive Index 10:
>
>    <xsl:variable name="vrtfRecIndex">
>      <xsl:call-template name="_randomRecursiveIndex">
>        <xsl:with-param name="pList"
>        select="/*/*"/>
>      </xsl:call-template>
>    </xsl:variable>
>
>    <xsl:variable name="vRecIndex"
>              select="ext:node-set($vrtfRecIndex)/*"/>
>
>    <xsl:for-each select="$vRecIndex">
>      <xsl:copy-of select="."/>&#xA;
>    </xsl:for-each>
>
>    Randomized 10-elements list:
>    <xsl:call-template name="_permutationFromRecursiveIndex">
>      <xsl:with-param name="pList" select="/*/*"/>
>      <xsl:with-param name="pRecIndex" select="$vRecIndex"/>
>    </xsl:call-template>
>
>    RandomizeList:
>    <xsl:call-template name="randomizeList">
>      <xsl:with-param name="pList" select="/*/*"/>
>    </xsl:call-template>
>
>    <xsl:variable name="vFunSquare"
>         select="document('')/*/mySquare:*[1]"/>
>
>    _mapFromRandIndex (^2) [1..10] seed:
>    <xsl:call-template name="_mapFromRandIndex">
>      <xsl:with-param name="pFun" select="$vFunSquare"/>
>      <xsl:with-param name="pList" select="/*/*"/>
>      <xsl:with-param name="pRecIndex" select="$vRecIndex"/>
>    </xsl:call-template>
>
>    <xsl:variable name="vFunDouble"
>         select="document('')/*/myDouble:*[1]"/>
>
>    randomMap (*2) [1..10] seed:
>    <xsl:call-template name="randomMap">
>      <xsl:with-param name="pFun" select="$vFunDouble"/>
>      <xsl:with-param name="pList" select="/*/*"/>
>    </xsl:call-template>
>
>    randListIndex [1..10] seed:
>    <xsl:call-template name="randListIndex">
>      <xsl:with-param name="pList" select="/*/*"/>
>    </xsl:call-template>
>
>  </xsl:template>
>
>  <xsl:template match="mySquare:*" mode="f:FXSL">
>    <xsl:param name="arg1"/>
>
>    <xsl:value-of select="$arg1 * $arg1"/>
>  </xsl:template>
>  <xsl:template match="myDouble:*" mode="f:FXSL">
>    <xsl:param name="arg1"/>
>
>    <xsl:value-of select="$arg1 + $arg1"/>
>  </xsl:template>
></xsl:stylesheet>
>
>is applied on this source XML document:
>
><nums>
>  <num>01</num>
>  <num>02</num>
>  <num>03</num>
>  <num>04</num>
>  <num>05</num>
>  <num>06</num>
>  <num>07</num>
>  <num>08</num>
>  <num>09</num>
>  <num>10</num>
></nums>
>
>the result is:
>
>
>
>    Random Recursive Index (dScale (randomSequence 100)):
>
>    <el>27</el>
><el>90</el>
><el>14</el>
><el>78</el>
><el>65</el>
><el>13</el>
><el>27</el>
><el>85</el>
><el>75</el>
><el>33</el>
><el>31</el>
><el>26</el>
><el>9</el>
><el>40</el>
><el>31</el>
><el>80</el>
><el>19</el>
><el>44</el>
><el>52</el>
><el>7</el>
><el>8</el>
><el>73</el>
><el>55</el>
><el>16</el>
><el>68</el>
><el>20</el>
><el>29</el>
><el>4</el>
><el>3</el>
><el>30</el>
><el>51</el>
><el>41</el>
><el>14</el>
><el>32</el>
><el>66</el>
><el>4</el>
><el>19</el>
><el>51</el>
><el>48</el>
><el>59</el>
><el>30</el>
><el>1</el>
><el>49</el>
><el>57</el>
><el>14</el>
><el>53</el>
><el>13</el>
><el>10</el>
><el>10</el>
><el>38</el>
><el>13</el>
><el>37</el>
><el>13</el>
><el>36</el>
><el>22</el>
><el>7</el>
><el>28</el>
><el>25</el>
><el>28</el>
><el>7</el>
><el>29</el>
><el>3</el>
><el>34</el>
><el>28</el>
><el>7</el>
><el>13</el>
><el>14</el>
><el>5</el>
><el>32</el>
><el>25</el>
><el>25</el>
><el>24</el>
><el>8</el>
><el>26</el>
><el>23</el>
><el>14</el>
><el>11</el>
><el>18</el>
><el>15</el>
><el>6</el>
><el>5</el>
><el>6</el>
><el>9</el>
><el>4</el>
><el>8</el>
><el>14</el>
><el>12</el>
><el>12</el>
><el>5</el>
><el>2</el>
><el>5</el>
><el>1</el>
><el>4</el>
><el>1</el>
><el>4</el>
><el>4</el>
><el>1</el>
><el>2</el>
><el>1</el>
><el>1</el>
>
>    Random Recursive Index 10:
>
>    <el>3</el>
><el>9</el>
><el>2</el>
><el>6</el>
><el>5</el>
><el>1</el>
><el>2</el>
><el>3</el>
><el>2</el>
><el>1</el>
>
>    Randomized 10-elements list:
>    <el>03</el>
><el>10</el>
><el>02</el>
><el>08</el>
><el>07</el>
><el>01</el>
><el>05</el>
><el>09</el>
><el>06</el>
><el>04</el>
>
>    RandomizeList:
>    <el>03</el>
><el>10</el>
><el>02</el>
><el>08</el>
><el>07</el>
><el>01</el>
><el>05</el>
><el>09</el>
><el>06</el>
><el>04</el>
>
>    _mapFromRandIndex (^2) [1..10] seed:
>    <el>9</el>
><el>100</el>
><el>4</el>
><el>64</el>
><el>49</el>
><el>1</el>
><el>25</el>
><el>81</el>
><el>36</el>
><el>16</el>
>
>    randomMap (*2) [1..10] seed:
>    <el>6</el>
><el>20</el>
><el>4</el>
><el>16</el>
><el>14</el>
><el>2</el>
><el>10</el>
><el>18</el>
><el>12</el>
><el>8</el>
>
>    randListIndex [1..10] seed:
>    <el>3</el>
><el>10</el>
><el>2</el>
><el>8</el>
><el>7</el>
><el>1</el>
><el>5</el>
><el>9</el>
><el>6</el>
><el>4</el>
>
>The last result gives us a random index of the integers in [1, 10]
>
>These indexes can be used to select in a random order 10 nodes.
>
>In XSLT 2 one can use the standard XPath function current-time() for
>the creation of the seed:
>http://www.w3.org/TR/xpath-functions/#func-current-time
>
>Cheers,
>Dimitre
>
>
>
>On Sat, Sep 13, 2014 at 7:29 AM, Eliot Kimber ekimber@xxxxxxxxxxxx
><xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx> wrote:
>> Using XSLT 2 I need to implement rendering of "match table" questions
>> where you have two sets of items, the match item and the thing it
>>matches
>> to. I want to present this as a literal table, where the first column is
>> the match-from items in source order and the second column is the
>>match-to
>> items, in random order.
>>
>> I think this is best characterized as a "shuffle" problem, where you
>>want
>> to reorder a list randomly but all items in the list must be accounted
>> for.
>>
>> I can think of a recursive algorithm: given a list, generate a random
>> integer between 1 and the list length, select that item and add it to
>>the
>> result list, then call this function on the original list minus the node
>> you just selected.
>>
>> Is there an easier or more efficient way to do it?
>>
>> Thanks,
>>
>> Eliot
>> bbbbb
>> Eliot Kimber, Owner
>> Contrext, LLC
>> http://contrext.com