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R: Bar chart from XML
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1. R: Bar chart from XML
This page looks at two typical ways in which XML data is represented. For each, an R program is provided to use that XML data to create a bar chart.

The XML package is required.

2. Install R package XML
R packages can be installed from R Studio or from the command line. Here is one way to install the R package XML from the Windows command line using the default Windows installation path for R.
"C:\Program Files\R\R-4.0.4\bin\Rscript.exe" -e "install.packages('XML', repos='https://cran.rstudio.com/')"

The repo parameter needs to be included and the single quotes need to be used inside the double quotes.
The path you use should include the installed version of R. The one here is 4.0.4.

3. Representing and processing count data
Here are links to the topic series of representing and processing data. R examples: Python examples: JavaScript and D3 examples: Julia examples: ... more to be added ...

4. Nodes with attribute values
Here is the XML data to be read as nodes with attributes as name-value pairs.
<table> <record name="a" value="59900"/> <record name="b" value="11302"/> <record name="c" value="14311"/> <record name="d" value="34483"/> <record name="e" value="95247"/> <record name="f" value="17852"/> <record name="g" value="13528"/> <record name="h" value="62509"/> <record name="i" value="46347"/> <record name="j" value="2321"/> <record name="k" value="4449"/> <record name="l" value="25939"/> <record name="m" value="19154"/> <record name="n" value="51311"/> <record name="o" value="54741"/> <record name="p" value="9918"/> <record name="q" value="183"/> <record name="r" value="37468"/> <record name="s" value="44630"/> <record name="t" value="72396"/> <record name="u" value="20651"/> <record name="v" value="7458"/> <record name="w" value="18376"/> <record name="x" value="376"/> <record name="y" value="14814"/> <record name="z" value="234"/> </table>


5. R code
Here is the R code [#1]


6. Code notes
... more to be added ...

7. R output
Here is the output of the R code.


8. R chart
This is a simple bar chart for the present purposes. Future topics will cover how to make it look nicer.
Here is the chart produced by the R code. Count by Letter

9. Nodes with text values
Here is the XML data to be read as nodes with text values as name-value pairs.
<table> <record><name>a</name><value>59900</value></record> <record><name>b</name><value>11302</value></record> <record><name>c</name><value>14311</value></record> <record><name>d</name><value>34483</value></record> <record><name>e</name><value>95247</value></record> <record><name>f</name><value>17852</value></record> <record><name>g</name><value>13528</value></record> <record><name>h</name><value>62509</value></record> <record><name>i</name><value>46347</value></record> <record><name>j</name><value>2321</value></record> <record><name>k</name><value>4449</value></record> <record><name>l</name><value>25939</value></record> <record><name>m</name><value>19154</value></record> <record><name>n</name><value>51311</value></record> <record><name>o</name><value>54741</value></record> <record><name>p</name><value>9918</value></record> <record><name>q</name><value>183</value></record> <record><name>r</name><value>37468</value></record> <record><name>s</name><value>44630</value></record> <record><name>t</name><value>72396</value></record> <record><name>u</name><value>20651</value></record> <record><name>v</name><value>7458</value></record> <record><name>w</name><value>18376</value></record> <record><name>x</name><value>376</value></record> <record><name>y</name><value>14814</value></record> <record><name>z</name><value>234</value></record> </table>


10. R code
Here is the R code [#2]


11. Code notes
... more to be added ...

12. R output
Here is the output of the R code.


13. R chart
This is a simple bar chart for the present purposes. Future topics will cover how to make it look nicer.
Here is the chart produced by the R code. Count by Letter

14. End of page

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