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<node CREATED="1490715205717" ID="ID_1874638551" MODIFIED="1490715247836" TEXT="m[c(&quot;R1&quot;,&quot;R2&quot;),c(&quot;C3&quot;,&quot;C4&quot;)] # submatrix"/>
<node CREATED="1490715299978" ID="ID_524280990" MODIFIED="1490715320312" TEXT="dim(m) # dimension"/>
<node CREATED="1490715409447" ID="ID_1522537661" MODIFIED="1490715472051" TEXT="det(m) # determinant"/>
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<richcontent TYPE="NODE"><html>
  <head>
    
  </head>
  <body>
    <p>
      patientID &lt;- c(1, 2, 3, 4)
    </p>
    <p>
      age &lt;- c(15, 34, 78, 23)
    </p>
    <p>
      diabetes &lt;- c(&quot;Type1&quot;, &quot;Type2&quot;, &quot;Type1&quot;, &quot;Type1&quot;)
    </p>
    <p>
      status &lt;- c(&quot;Poor&quot;, &quot;Improved&quot;, &quot;Excellent&quot;, &quot;Poor&quot;)
    </p>
    <p>
      
    </p>
    <p>
      df &lt;- data.frame(patientID, age, diabetes, status)
    </p>
  </body>
</html></richcontent>
</node>
<node CREATED="1490715959936" ID="ID_768161434" MODIFIED="1490715988367" TEXT="df[1:2]"/>
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<node CREATED="1490716081845" ID="ID_276015641" MODIFIED="1490716094467" TEXT="df[&quot;diabetes&quot;]"/>
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<node CREATED="1490716607666" ID="ID_838662312" MODIFIED="1490716965272">
<richcontent TYPE="NODE"><html>
  <head>
    
  </head>
  <body>
    <p>
      attach(df)
    </p>
    <p>
      &#160;&#160;&#160;&#160;summary(diabetes)
    </p>
    <p>
      &#160;&#160;&#160;&#160;plot(age)
    </p>
    <p>
      &#160;&#160;&#160;&#160;stat &lt;- status
    </p>
    <p>
      detach(df)
    </p>
  </body>
</html></richcontent>
<node CREATED="1490716969825" ID="ID_1422570348" MODIFIED="1490717197952" TEXT="stat should not collide with other variables"/>
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<richcontent TYPE="NODE"><html>
  <head>
    
  </head>
  <body>
    <p>
      with(df, {
    </p>
    <p>
      &#160;&#160;&#160;&#160;summary(diabetes)
    </p>
    <p>
      &#160;&#160;&#160;&#160;plot(age)
    </p>
    <p>
      &#160;&#160;&#160;&#160;unexportAge &lt;- age
    </p>
    <p>
      &#160;&#160;&#160;&#160;exportAge &lt;&lt;- age
    </p>
    <p>
      })
    </p>
  </body>
</html></richcontent>
<node CREATED="1490717201140" ID="ID_1218456624" MODIFIED="1490717286001" TEXT="&lt;- make variable visible only in the lexical scope"/>
<node CREATED="1490717287419" ID="ID_900248241" MODIFIED="1490717296869" TEXT="&lt;- make variable visible outside"/>
</node>
</node>
<node CREATED="1490717366979" FOLDED="true" ID="ID_558134654" MODIFIED="1490718166942" TEXT="factor -- categorical variable">
<node CREATED="1490717464144" ID="ID_1156454274" MODIFIED="1490717470723" TEXT="nominal">
<node CREATED="1490717530331" ID="ID_168497647" MODIFIED="1490717703201" TEXT="factor(df#diabetes)"/>
<node CREATED="1490717762610" ID="ID_77630174" MODIFIED="1490717763282" TEXT="sex &lt;- factor(sex, levels=c(1, 2), labels=c(&quot;Male&quot;, &quot;Female&quot;))"/>
</node>
<node CREATED="1490717482175" ID="ID_424300" MODIFIED="1490717484620" TEXT="ordinal">
<node CREATED="1490717549334" ID="ID_1621471268" MODIFIED="1490717699553" TEXT="factor(df#diabetes, ordered=TRUE)"/>
<node CREATED="1490717694236" ID="ID_658241595" MODIFIED="1490717695399" TEXT="factor(df$status, ordered=TRUE, levels=c(&quot;Poor&quot;, &quot;Improved&quot;,&quot;Excellent&quot;))"/>
</node>
</node>
<node CREATED="1490718171267" ID="ID_23296189" MODIFIED="1490718173611" TEXT="list">
<node CREATED="1490718178369" ID="ID_273817290" MODIFIED="1490718197591">
<richcontent TYPE="NODE"><html>
  <head>
    
  </head>
  <body>
    <p>
      g &lt;- &quot;My First List&quot;
    </p>
    <p>
      h &lt;- c(25,26,18,39)
    </p>
    <p>
      j &lt;- matrix(1:10, nrow=5)
    </p>
    <p>
      k &lt;- c(&quot;one&quot;, &quot;two&quot;, &quot;three&quot;)
    </p>
    <p>
      mylist &lt;- list(title=g, ages=h, j,k)
    </p>
  </body>
</html></richcontent>
</node>
<node CREATED="1490718200789" ID="ID_36304497" MODIFIED="1490718210184" TEXT="mylist[[1]]"/>
<node CREATED="1490718210607" ID="ID_1776285272" MODIFIED="1490718216564" TEXT="mylist[1]"/>
<node CREATED="1490718216971" ID="ID_517350219" MODIFIED="1490718222725" TEXT="mylist$ages"/>
</node>
</node>
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<node CREATED="1490630556435" ID="ID_102336332" MODIFIED="1490630586449" TEXT="package usage">
<node CREATED="1490630593970" ID="ID_749696817" MODIFIED="1490630603679" TEXT="1. install.packages(&quot;foobar&quot;)"/>
<node CREATED="1490630604168" ID="ID_1246032922" MODIFIED="1490630613148" TEXT="2. help(pacakge=&quot;foobar&quot;)"/>
<node CREATED="1490630613673" ID="ID_583521357" MODIFIED="1490630627183" TEXT="3. demo(package=&quot;foobar&quot;)"/>
<node CREATED="1490630627651" ID="ID_599377207" MODIFIED="1490630642090" TEXT="4. demo(foobar::demo1)"/>
</node>
<node CREATED="1490630548036" ID="ID_378758131" MODIFIED="1490630571676" TEXT="function usage">
<node CREATED="1490630644817" ID="ID_1793650757" MODIFIED="1490630703360" TEXT="1. apropos(&quot;func&quot;, mode=&quot;function&quot;)"/>
<node CREATED="1490630674586" ID="ID_597945257" MODIFIED="1490630705803" TEXT="2. help(pacakge=&quot;foobar&quot;)"/>
<node CREATED="1490630688466" ID="ID_1178896426" MODIFIED="1490630709017" TEXT="3. ?func"/>
<node CREATED="1490630694207" ID="ID_1310986165" MODIFIED="1490630711185" TEXT="4. example(func)"/>
</node>
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