Troubleshooting - A Guide to MATLAB for Beginners and Experienced Users - page 281

letters = 'abcdefghijklmnopqrstuvwxyz';
caps = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ';
for n = 1:26
count(n) = sum(str == letters(n)) + sum(str == caps(n));
end
bar(count)
ylabel 'Number of occurrences'
title(['Letter frequencies in ' file])
set(gca, 'XLim', [0 27], 'XTick', 1:26, 'XTickLabel', ...
letters')

Here is the result of running this M-file on itself:

letcount('letcount.m')

Letter frequencies in letcount.m

30

25

20

15

10

5

0

a b c d e f g h i j k l m n o p q r s t u v w x y z

Problem 8

We let w, x , y , and z , denote the number of residences canvassed in the four
cities Gotham, Metropolis, Oz, and River City, respectively. Then the linear
inequalities specified by the given data are as follows:
Nonnegative data: w ≥ 0 , x ≥ 0 , y ≥ 0 , z ≥ 0;
Pamphlets: w + x + y + z ≤ 50 , 000;
Travel cost: 0 . 5 w + 0 . 5 x + y + 2 z ≤ 40 , 000;
Time available: 2 w + 3 x + y + 4 z ≤ 18 , 000;
Preferences: w ≤ x , x + y ≤ z ;