## testinputfields.lua

    local input = require 'pl.input'
    local sum = 0.0
    local count = 0
    local text = [[
        981124001	2.0	18988.4	10047.1	4149.7
        981125001	0.8	19104.0	9970.4	5088.7
        981127003	0.5	19012.5	9946.9	3831.2
    ]]
    for id,magn,x in input.fields(3,' ',text) do
      sum = sum + x
      count = count + 1
    end
    print('average x coord is ',sum/count)

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