By James Church
While you are a developer, analyst, or information scientist who desires to study facts research tools utilizing Haskell and its libraries, then this booklet is for you. past event with Haskell and a easy wisdom of information technology should be useful.
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Extra resources for Learning Haskell Data Analysis
Sample text
0 2 1 1 2 3 2 3 1 3 4 5 1 2 From this small sample of input, we believe that our function is working correctly. We can use this function on later datasets to find the median of samples. Interactive Haskell This section will be used to familiarize you with the Haskell interactive command line. ghci in your home folder. We have configured ours with the following code: :set prompt "> " The preceding code tells the interactive command line to display a single > as the prompt. You can start the interactive command line using the ghci command.
Linking ... done. > You can execute simple equations using either the familiar infix notation, or the functional notation: > 2 + 2 4 > (+) 2 2 4 > 2 + 4 * 5 22 > (+) 2 $ (*) 4 5 22 [ 15 ] Tools of the Trade Note that we need to use $ here in order to tell Haskell that the (*) 4 5 multiplication portion is an argument to the (+) 2 addition portion. An introductory problem This introductory problem will serve as a way of explaining the features of the Haskell language that are used repeatedly in this book.
This advice comes with a warning—every time you load or reload a library in Haskell, the entire environment (and all your delicately typed expressions) will be reset. You will lose everything on doing this. This is typically countered by having a separate text editor open where you can type out all your Haskell commands and paste them in the GHCi interpreter. Summary This chapter looked at Haskell from the perspective of a data analyst. We looked at Haskell's feature set (functional, type-inferred, and lazy).