mapcar is a function that calls its first argument with each
element of its second argument, in turn. The second argument must be
(mapcar '1+ '(2 4 6)) => (3 5 7)
1+ which adds one to its argument, is executed on
each element of the list, and a new list is returned.
Contrast this with
apply, which applies its first argument to
all the remaining.
(See section Readying a Graph, for a explanation of
In the definition of
one-fiftieth, the first argument is the
(lambda (arg) (/ arg 50))
and the second argument is
full-range, which will be bound to
The whole expression looks like this:
(mapcar '(lambda (arg) (/ arg 50)) full-range))
See section `Mapping Functions' in The GNU Emacs Lisp Reference Manual, for more about
one-fiftieth function, we can generate a list in
which each element is one-fiftieth the size of the corresponding
(setq fiftieth-list-for-graph (one-fiftieth list-for-graph))
The resulting list looks like this:
(10 20 19 15 11 9 6 5 4 3 3 2 2 1 1 1 1 0 1 0 0 0 0 0 0 0 0 0 0 0 4)
This we are almost ready to print! (We also notice the loss of information: many of the higher ranges are 0, meaning that fewer than 50 defuns had that many words or symbols--but not necessarily meaning that none had that many words or symbols.)
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