MATLAB ?????? - PowerPoint PPT Presentation

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MATLAB ??????

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Title: MATLAB ??????


1
MATLAB ??????
  • ???
  • hyfan_at_ntnu.edu.tw
  • http//math.ntnu.edu.tw/hyfan
  • ?????????

2
2.1 ?????
3
2.2 MATLAB ??????
  • ????????????

var expression
4
????(I)
  • ??()
  • ??()
  • ??transpose()

5
????(II)
  • ?????()

6
??????
?? ??
zeros(m, n) ????? mn ,?????? 0 ???
ones(m, n) ????? mn ,?????? 1 ???
eye(n) ????? nn ,????????? 1 ,??????? 0 ?????
pascal(m, n) ????? mn ? Pascal ??
vander(m, n) ????? mn ? Vandermonde ??
hilb(n) ????? nn ? Hilbert ??
rand(m, n) ?? 0, 1 ?????????,???? mn
randn(m, n) ?? µ 0, s 1 ?????????,???? mn
magic(n) ????? nn ????,????????????????????
7
??????????
  • ?????

30
  • ??????

8
2.3 ????????
  • ? MATLAB ??????,?????????,????????,????(Dimensions
    )?? 1 ??????????????(Multidimesional Arrays,??
    N-D Arrays)?

9
????(I)
  • ?????????,??????(Dimensions)
  • ????(Row)
  • ????(Column)

??
(1,1) (1,2) (1,3) (1,4)
(2,1) (2,2) (2,3) (2,4)
(3,1) (3,2) (3,3) (3,4)
??
10
????(II)
  • ????,?????? X - Y ??????,????

Y(?)
X(?)
11
???????? (I)
12
???????? (II)
4 1 10 6 1 11 6 16 2 21
8 2 2 7 9 12 4 17 7 22
7 3 5 8 7 13 1 18 5 23
0 4 3 9 4 14 5 19 4 24
23 5 13 10 13 15 0 20 3 25
A
13
????(I)
  • ???????????,????????,???????????(Page),????

(1,1) (1,2) (1,3) (1,4)
(2,1) (2,2) (2,3) (2,4)
(3,4)
?
(1,1) (1,2) (1,3) (1,4)
(2,1) (2,2) (2,3) (2,4)
(3,1) (3,2) (3,3) (3,4)
?
?
?
14
????(II)
  • ????,?????? X - Y - Z ??????,????

Z(?)
Y(?)
X(?)
15
????(III)
  • ??????,??(?,?,?)???
  • ???? 342 ???????,??????????
  • ?? A ?????,?? A(,,1)??????????,A(,,2)?????????
    ??

16
2.5 ?????
?? ? ?
pi ?? ?15???????
i, j ?? ??
inf ?????,?????0???
NaN ????,????????????
eps ?????????????
ans ????????????
17
2.6 ??????
???? ? ? ? ?
format short ??4???(???) 12.3457
format long ??14??? 12.345678901234567
format short e ??5??????? 1.2346e001
format short g ????5???(????????) 12.346
format long e ??15???????? 1.234567890123457e001
format long g ????15???(????????) 12.3456789012346
format hex 16?????? 4028b0fcd32f707a
18
disp
19
fprintf???? ?
20
Example/conv_rate/conv_ratio.m
???? ? ?
d ?????????
e ?????????
f ??????????
g ?????????????,??????????
\n ??????
21
2.7 ????
22
2.8 ???????
???? MATLAB ??
?? a b
?? a - b
?? a b
?? a / b
??? ab
23
???????
  • ??????????(Scalar)?????
  • ?????????????????
  • ?????????????,MATLAB ??????????????

24
????????
  • ?????????,???????
  • ???????,??????????????( Column Dimension)
    ??????????????(Row Dimension)
  • ?????,????????????????

25
????????
  • A\b????? inv(A)b ???,??inv(A)?A????
  • a\B????? ainv(B) ???

26
???????
  • ???????,???????,????????,?????????
  • ???,?/????????????,MATLAB ??????????????(Element
    -by-element) ???

27
???????????
  • ???? z,?????????(Conjugate Transpose) ?????? z'
  • ??????? z ???(Transpose),??????? z. '
  • ? z ???,? z' ? z.' ???????

28
2.11 ??????
  • x 00.110
  • y x.210.x15
  • plot(x,y)

29
???????(I)

option ????
-deps ??????? eps ??
-depsc ??????? eps ??
-dpng ???? png ??
-dtiff ??????? tiff ??
30
???????(II)

31
??????
  • x 0pi/1002pi
  • y1 sin(2x)
  • y2 2cos(2x)
  • plot( x, y1, x, y2 )

32
?????????????????(I)
33
?????????????????(II)
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