This lab is also available in PDF.
Summary: In this laboratory, you will explore techniques
a. Make your own copies of the following files. (Note that the easiest
way to make your own copy is to right click on the file and select
extension, delete that extension and do not add
b. Open your copy of
textgen.ss. You will be working with
this copy throughout this lab and the next.
a. Generate ten
random sentences using
b. What sentence structures do you see in those ten sentences?
c. Make a list of the parts of speech you see, what words appear for each part of speech you see, and the relative frequency of each word within its part of speech.
d. Suppose we were to generate ten
random nouns using
(generate-part-of-speech 'noun). What words would you expect
to see, and in what relative frequencies?
e. Look at
opening it in DrScheme. Do the frequencies stated in that file match
those you encountered in parts a and c?
a. Edit your copies of
tverbs.txt to insert at least four more
words in each. (You can edit each file in DrScheme, but you should not
try to run it.) Note that you will also have to change the frequencies
of the existing words to make the total be 1000. (You can check the
You should not spend more than five or so minutes updating these copies. (You'll have a chance to make more changes later.)
b. Generate ten new sentences. Did your sentences include your own words?
If not, read through the code to see where
for the words (hint, it's a variable called
root) and then
update it to use your words. (If you saved the files on your desktop,
the new root should be
One issue with the
sentence procedure is that it does not
capitalize the sentences it writes.
a. Write a procedure,
(capitalize str), that
capitalizes the first letter in str.
sentence to use this new procedure.
c. Generate ten or so sentences to ensure that your update has worked.
sentence so that it randomly selects between two
sentence structures. (You may choose the alternate structure.)
b. Generate ten or so sentences to ensure that your update has worked.
a. Create a new words file,
iverbs.txt, that contains a variety
of intransitive verbs. Recall that each line of the file should have the
("word" frequency) and that the sum of
the frequencies should be 1000.
check-words-file to make sure that your file has the
sentence to add a third kind of sentence, one that
includes intransitive verbs.
If you find that you've finished all of the work, you might consider
I usually create these pages
on the fly, which means that I rarely
proofread them and they may contain bad grammar and incorrect details.
It also means that I tend to update them regularly (see the history for
more details). Feel free to contact me with any suggestions for changes.
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