sparklines for R

迈不过友情╰ 2022-08-07 12:53 144阅读 0赞

(This article was first published on  **[FishyOperations][]**, and kindly contributed to [R-bloggers)][R-bloggers]

I’ve always liked the [ jQuery Sparklines][jQuery Sparklines] library and today I had a use case for implementing these in one of my [Rmarkdown][] reports.

While it wouldn’t be too difficult to staticly include a javascript based chart, ideally I would simply want to dynamically generate the sparkline using values computed in R. Luckily we now have [htmlwidgets for R][]. This library makes it stupidly simple to integrate javascript libraries in R code. It simply up to one who has a use case for integrating a javascript library with R to insert some *glue* code: and so `sparklines` was born.

Usage is quite straightforward. I’ll retrieve some weatherdata for Brussels to populate a few sparkline charts.

library(weatherData)
    weatherset <- getWeatherForDate("BRU", start_date = "2015-03-15", end_date = "2015-04-09", opt_verbose=F)
    weather_values <- as.vector(weatherset$Mean_TemperatureC)

Let’s have a look at the temperature data.

weather_values

##  [1]  4  5  8  6  6  6  6  4  4  5  4  3  6  7 10  7  9  7  6  4  6  5  4
    ## [24]  6  8 10

Now for the sparklines:

library(sparklines)
    sparkline(weather_values, "line")

sparkline(weather_values, "bar")

sparkline(weather_values, "tristate")

sparkline(weather_values, "box")

Almost all configuration options and chart types as specified at [ http://omnipotent.net/jquery.sparkline/\#s-docs][http_omnipotent.net_jquery.sparkline_s-docs] are available. And, as a nice side note, it is also possible to use it in combination with Shiny :)

Installation instructions, configuration options, sourcecode and other documentation is available at [ https://github.com/Bart6114/sparklines][https_github.com_Bart6114_sparklines].

[FishyOperations]: http://fishyoperations.com/2015/04/10/sparklines-for-R.html
[R-bloggers]: http://www.r-bloggers.com/
[jQuery Sparklines]: http://omnipotent.net/jquery.sparkline/#s-about
[Rmarkdown]: http://rmarkdown.rstudio.com/
[htmlwidgets for R]: http://www.htmlwidgets.org/
[http_omnipotent.net_jquery.sparkline_s-docs]: http://omnipotent.net/jquery.sparkline/#s-docs
[https_github.com_Bart6114_sparklines]: https://github.com/Bart6114/sparklines