The AWK Programming Language by Aho Alfred V. Kernighan Brian W. Weinberger Peter J. & Brian W. Kernighan & Peter J. Weinberger
Author:Aho, Alfred V., Kernighan, Brian W., Weinberger, Peter J. & Brian W. Kernighan & Peter J. Weinberger
Language: eng
Format: epub
Publisher: Pearson Education
Published: 2023-09-15T00:00:00+00:00
7.2 A Language for Drawing Graphs
The lexical and syntactic simplicity of our assembly language made its analysis easy to do with field splitting. This same simplicity also appears in some higher-level languages. Our next example is a processor for a prototype language called graph, for plotting graphs of data. The input is a graph specification in which each line is a data point or labeling information for the coordinate axes. Data points are x-y pairs, or y values for which a default sequence of x values 1, 2, 3, etc., is to be generated. Labeling information consists of a keyword and parameter values like
label caption xlabel caption ylabel caption
Such lines can appear in any order, so long as they precede the data. They are all optional.
The processor reads the data and produces a Python program together with a temporary file containing the data in the right format. Running the Python program produces a nicely formatted graph. This is a reasonable division of labor: Awk is well suited for simple processing, while Python plotting libraries like Matplotlib do an excellent job of displaying information. For example, this input:
Click here to view code image
title US Traffic Deaths by Year xlabel Year ylabel Traffic deaths 1900 36 1901 54 1902 79 1903 117 1904 172 ... 2017 37473 2018 36835 2019 36355 2020 38824 2021 42915
produces the output shown in Figure 7-1.
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