eintr: Prepare the data

 
 14.9 Prepare the Data for Display in a Graph
 ============================================
 
 The ‘recursive-lengths-list-many-files’ function returns a list of
 numbers.  Each number records the length of a function definition.  What
 we need to do now is transform this data into a list of numbers suitable
 for generating a graph.  The new list will tell how many functions
 definitions contain less than 10 words and symbols, how many contain
 between 10 and 19 words and symbols, how many contain between 20 and 29
 words and symbols, and so on.
 
    In brief, we need to go through the lengths’ list produced by the
 ‘recursive-lengths-list-many-files’ function and count the number of
 defuns within each range of lengths, and produce a list of those
 numbers.
 

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