CPSC 320 -- 500 Artificial Intelligence Written Homework 4

To be turned in by 4:45 pm on Apr. 23:

Answer the following questions from the book:   14.3, 14.7, 18.3, 18.4, 19.1, 19.3a, 24.2, 24.4

CPSC 320 - 500 LISP Lab 3 -- Natural Language Processing

Due 11:59 pm on April 30 -- turn in your code electronically using the turnin pro-
gram as on previous labs:

Write a LISP program that takes as input the text of a written weather forecast and correctly fills in 
the slots in a frame representing the predicted weather conditions. Your program will be tested on 
actual written forecasts from places like newspapers, weather and news sites on the Web, and TV. 
Completeness and correctness of the information entered into the frame representing the predicted 
weather conditions will determine your grade on this assignment.

The input to your program (a function called parse-forecast) will be a list of lists -- each inner list 
containing the words in one "sentence" of the forecast. The following are examples of forecasts 
(notice while they are in natural language, they are not necessarily grammatical):

((clear and cool) (low near 50) (northwest wind diminishing to 5 to 10 mph))

((sunny) (high near 80) (north wind near 10 mph becoming northeast 5 to 10 mph late))

((high near 80 with increasing clouds and a 70 percent chance of rain in the afternoon) (tonight we 
will see fair skies and a low near 50))

The output from your function should be the frame containing the predicted weather information. 
Your function must be defined as follows:

	(defun parse-forecast (weather-text)
		(setf forecast (make-weather))
		... <parse text setting slots in frame appropriately>
		forecast)

The weather structure definition will be as follows. This will be defined in our testing code, so all you 
need to turn in is the parse-forecast function and any helper functions you have defined.

	(defstruct weather
		(high-temp nil)
		(low-temp nil)
		(rain-prob nil)
		(wind-speed nil)
		(wind-direction nil)
		(cloud-cover nil)
		(other-descriptors nil))

Say you have parsed the phrase "winds to 10 mph". To set the wind-speed slot within the forecast 
frame constructed with (make-weather) you will need to:
	(setf (weather-wind-speed) 10)

Values for slots may be numeric or textual -- wind-speed might be described as gusty rather than 
having a specific numeric value. Slot values not mentioned should be nil (this is how they start off.)