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/usr/share/gedit/plugins/RCtrl/Wizards/plots_hist.xml is in gedit-r-plugin 0.7.1.1-Gtk3-1.

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The actual contents of the file can be viewed below.

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<!-- Define a rwizard -->
<rwizard name="hist" description="Plots a histogram" 
         menu="/Plots" icon="plots_hist.png">
    <about 
        name="Histogram"
        version="0.1"
        copyright="(c) 2010 Dan Dediu"
        comments="Plots a histogram. Inspired by R Commander's 'Histogram'"
        license="GLPv3"
        website="http://rgedit.sourceforge.net/"
        authors="Dan Dediu &lt;ddediu@hotmail.com&gt;" 
        documenters=""
        artists=""
        translator_credits=""
        logo_icon_name="plots_hist.png"/>
        
    <help rhelp="?hist"/>

    <vars>  
        <block title="Histogram's parameters...">
            <variable name="x" description="The variable to be plotted" type="text" default="" required="True" tooltip="Must represent a numeric vector"/>
            <variable name="breaks" description="The alhorithm for computing the breaks" type="text" default='"Sturges"' required="True" tooltip="See documentation for possible values. Please quote strings!"/>
            <variable name="freq" description="Represent frequencies" type="list" singlechoice="True" default="0" required="False" tooltip=''>
                <value name="default"/>
                <value name="TRUE"/>
                <value name="FALSE"/>
            </variable>
            <variable name="main" description="The plot's main title" type="text" default="default" required="True" tooltip="Make sure to quote fixed strings!"/>
            <variable name="xlab" description="The x-axis label" type="text" default="default" required="True" tooltip="Make sure to quote fixed strings!"/>
            <variable name="ylab" description="The y-axis label" type="text" default="default" required="True" tooltip="Make sure to quote fixed strings!"/>
        </block>
    </vars>  

    <!-- The actual R code template: only strange thing is the placeholders call using ${PLACEHOLDER_NAME} -->
    <template> 
hist( x=${x}, breaks=${breaks} $[Python ('',', ${freq}')[not ('${freq}'=='default')] $] $[Python ('',', main=${main}')[not ('${main}' == "default")] $] $[Python ('',', xlab=${xlab}')[not ('${xlab}' == "default")] $] $[Python ('',', ylab=${ylab}')[not ('${ylab}' == "default")] $] )
    </template> 

</rwizard>