Contribution:
haskellBarchart
Headline
Analysis of historical company data with Language:Haskell
Characteristics
Historical data is simply represented as list of year-value pairs so that company data is snapshotted for a number of years and any analysis of historical data can simply map over the versions. A simple chart package for Haskell is leveraged to visualize the development of salary total and median over the years. In this manner, the contribution demonstrates how to declare external dependences via Technology:Cabal. Further, the contribution also demonstrates modularization and code organization. In particular, where clauses for local scope and export/import clauses for modularization are used carefully.
Illustration
We would like to generate barcharts as follows:
These barcharts are generated by the following functionality. Given a filename, a title (such as "Total" or "Median") and a year-to-data mapping, generate a PNG file with the barchart for the distribution of the data.
-- | Generate .png file for development of median
chart :: String -> String -> [(Int,Float)] -> IO ()
chart filename title values = do
let fileoptions = FileOptions (640,480) SVG empty
renderableToFile fileoptions (toRenderable layout) filename
return ()
where
layout
= def
& layout_title .~ "Development of salaries over the years"
& layout_plots .~ [plotBars bars]
bars
= def
& plot_bars_titles .~ [title]
& plot_bars_spacing .~ BarsFixGap 42 101
& plot_bars_style .~ BarsStacked
& plot_bars_values .~ values'
values'
= map (\(y,f) -> (y, [float2Double f])) values
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Syntax for editing wiki
For you are available next options:will make text bold.
will make text italic.
will make text underlined.
will make text striked.
will allow you to paste code headline into the page.
will allow you to link into the page.
will allow you to paste code with syntax highlight into the page. You will need to define used programming language.
will allow you to paste image into the page.
is list with bullets.
is list with numbers.
will allow your to insert slideshare presentation into the page. You need to copy link to presentation and insert it as parameter in this tag.
will allow your to insert youtube video into the page. You need to copy link to youtube page with video and insert it as parameter in this tag.
will allow your to insert code snippets from @worker.