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bThis tutorial was written to introduce MATLAB and provide examples to
use in conjunction with the `
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the operating system to logon, create
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-
1.1 Accessing MATLAB
%ÿþ
`
™
3ÿþ
™ 1 _Once a login session has been established and a UNIX windows has
been opened, two commands are
Aÿþ
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™se required to start MATLAB:
Oÿþ
`
™ §
r ]ÿþ
`
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% setup matlab-4.0a
kÿþ
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yÿþ
`
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% matlab
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•ÿþ
™
fThis begins execution. Note a change in prompt (from % to >>). On
line help is available for most MAT £ÿþ
@
™e !LAB commands. To invoke it type:
±ÿþ
`
™
¿ÿþ
`
™ I
¨ >> help
s Íÿþ
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™ra 8which provides a list of help topics to choose from, or
s, éÿþ
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>> help topic
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plot ™ .
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1UR
UT ªª `
# 2.1 Entering Matrices
?ÿü
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¨ help
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gMatrices can be entered into matlab from the command line or thorough
data files, we will be doing all ssi [ÿü
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™is dour work from the command line. Here is how to create a 3x3 matrix
and assign it to the variable A.
TL iÿü
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$ ™
§ wÿü
`
% ¨
>> A = [ 1 2 3; 4 5 6; 7 8 9 ]
…ÿü
`
& ™ÿþ
“ÿü
`
' ™at 2This produces the following response from MATLAB:
¡ÿü
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( ™n.
t ¯ÿü
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A =
½ÿü
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* ¬el
1 2 3
lab Ëÿü
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4 5 6
@
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, ¬.
7 8 9
it çÿü
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- ™
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. ™
\Note that MATLAB is case sensitive. Thus, when using variables,
ÒAÓ is not the same as ÒaÓ.
h ÿü
`
0 ™se
o ÿü
1 ™
^Random numbers and matrices. RAND(N) is an N-by-N matrix with
random entries. RAND(M,N) is an ÿü
1 ™he bM-by-N matrix with random entries. RAND(A) is the same size as A.
RAND with no arguments is a sca -ÿü
@
1 ™ri 4lar whose value changes each time it is referenced.
ic ;ÿü
`
5 ™in
m Iÿü
`
6 ¨ma
>> A = rand(3,2)
Wÿü
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7 ™l
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8 ™
¬ A =
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D ™t wOnce a matrix has been assigned to variable A, it is stored for
theduration of the MATLAB session, or until you assign
1 j
@
D ™rs 7new values to A. To clear A of any value, use clear A:
tri x
`
G ™n
ü †
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H ™M-
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th ”
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I ™AN
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J ™as &To empty all variables at once, type:
°
`
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L ™ea
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M ™ÿü
ÛUT
UT ªª `
N -ÿü 3.1 Matrix operations
éÿþ
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O ™
÷ÿþ
P ™
rWhile matrix operations act upon an entire matrix, MATLABÕs array
operators act upon the individual elements of a
ÿþ
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P ™
/matrix. For example, using A and B defined as:
ÿþ
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3 ™
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t -ÿþ
\ ¨ne
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>> A = [ 1 2; 3 4 ]
`
¬ A =
`
1 2
`
3 4
`
`
>> B = [ 5 6; 7 8 ]
`
B =
`
5 6
`
7 8
`
>> C = A * B
»ÿþ
`
] ™th
r Éÿþ
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