Page 825 - Mechatronics with Experiments

®
®
MATLAB , SIMULINK , STATEFLOW, AND AUTO-CODE GENERATION 811
Angle_Matrix =

0 0
90.0000 1.5708
180.0000 3.1416
270.0000 4.7124
360.0000 6.2832
>>

The default numerical data type in MATLAB ® is double precision floating point data,
double in C-language. Data can be defined and converted to integer data type using data
conversion functions. MATLAB ® supports 8-bit, 16-bit, 32-bit, and 64-bit signed and
unsigned integer data types. The data conversion function examples are shown below,

k1=int8(-10.3)
l1=int16(-1000.4)
m2=uint32(1000000.5)
n2=uint64(-100000000.6)

>>
k1 = -10
l1 = -1000
m2 = 1000001
n2 = 0

>>

Characters and strings (array of characters) are stored as vectors of ASCII code for each
character using a single quote to assign to a string variable. For instance

myTitle=’Plot of Torque versus Speed’ ;
size(myTitle)

>>
ans =
1 27

The character array variable (equivalently called the string variable) “myTitle” is a vector,
where each element of the vector stores the ASCII code of the characters. The “size()”
function counts the number of elements in this variable. The conversion between character
representation in ASCII code and numerical representations can be performed as follows,

char(97) % Prints the character corresponding to
ASCII code 97: a
double(’a’) % ...........ASCII code corresponding to
character ’a’

S = [’1 2’
’3 4’] ;
X = str2num(S)

S = num2str(X) ;