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

The rjson package is required.

2. Install R package rjson
R packages can be installed from R Studio or from the command line. Here is one way to install the R package rjson 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('rjson', 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 ... Here is the JSON data to be read as a list of lists of name-value pairs.
[ ["a",59900], ["b",11302], ["c",14311], ["d",34483], ["e",95247], ["f",17852], ["g",13528], ["h",62509], ["i",46347], ["j",2321], ["k",4449], ["l",25939], ["m",19154], ["n",51311], ["o",54741], ["p",9918], ["q",183], ["r",37468], ["s",44630], ["t",72396], ["u",20651], ["v",7458], ["w",18376], ["x",376], ["y",14814], ["z",234] ]


4. R code
Here is the R code [#1]


5. Code notes
... more to be added ...

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


7. 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 LetterHere is the JSON data to be read as a list of dicts (i.e., dictionaries) with name-value pairs.
[ {"name":"a", "value":59900}, {"name":"b", "value":11302}, {"name":"c", "value":14311}, {"name":"d", "value":34483}, {"name":"e", "value":95247}, {"name":"f", "value":17852}, {"name":"g", "value":13528}, {"name":"h", "value":62509}, {"name":"i", "value":46347}, {"name":"j", "value":2321}, {"name":"k", "value":4449}, {"name":"l", "value":25939}, {"name":"m", "value":19154}, {"name":"n", "value":51311}, {"name":"o", "value":54741}, {"name":"p", "value":9918}, {"name":"q", "value":183}, {"name":"r", "value":37468}, {"name":"s", "value":44630}, {"name":"t", "value":72396}, {"name":"u", "value":20651}, {"name":"v", "value":7458}, {"name":"w", "value":18376}, {"name":"x", "value":376}, {"name":"y", "value":14814}, {"name":"z", "value":234} ]


8. R code
Here is the R code [#2]


9. Code notes
... more to be added ...

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


11. 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

12. End of page

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