MATLAB POLYSPACE RELEASE NOTES Instrukcja Użytkownika Pobierz pdf (Strona 152)

4 Programming

Internally, the characters are stored as numbers, but not in floating-point

format. The statement

a = double(s)

converts the character array to a numeric matri

x containing floating-point

representations of the ASCII codes for each ch

aracter. The resul t is

72 101 108 108 111

The statement

s = char(a)

reverses the conversion.

Converting numbers to characters makes it possible to investigat e t he various

fonts available on your computer. The printable characters in the basic A SCII

character set are represented by the integers

32:127. (The integers less than

32 represent no nprintable control characters.) These integers are arranged in

an appropriate 6-by-16 array with

F = reshape(32:127,16 ,6)';

The printable characters in the extended ASCII character set are represented

F+128. When these integers are interpreted as characters, the result

depends on the font currently being used. Type the statements

char(F)

char(F+128)

and then vary the font being used for the Command Window. Select

Preferences from the File menu to change the font. If you include tabs in

lines of code, use a fixed-width font, such as Monospaced, to align the tab

positions on different lines.

Concatenationwithsquarebracketsjoins text variables together into larger

strings. The statement

h = [s, ' world']

4-14

1 2 ... 147 148 149 150 151 152 153 154 155 156 157 ... 239 240

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MATLAB POLYSPACE RELEASE NOTES Instrukcja Użytkownika Strona 152