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MATLAB
200700 ,
621.381
. .
., .. . .
MATLAB: / . . : , 2006. 48
MATLAB.
.: 9 . .2. .37.
1 MATLAB.................................................... 4
1.1 .................................................................................... 4
1.2 ................................... 5
2 1...................................................................................................... 11
2.1 ........................................................................................................... 11
2.2 ................................................................................... 12
2.3 1....................................................................................... 16
2.3.1 ......................... 16
2.3.2 .................................................... 17
2.3.4 ................................. 19
2.3.5 ............................................... 21
2.3.6 .................................................. 22
2.3.7 .................................... 23
2.3.8 , ........................................................................... 24
3 2.................................................................................................. 27
3.1 ........................................................................................................... 27
3.2 2................................................................................... 28
3.2.1 - ......................... 28
3.2.2 ................. 29
3.2.3 - ................... 30
3.2.4 - ....................................................................................... 31
3.2.5 - ............................................................................... 33
3.2.6 .................................................................... 35
4 3...................................................................................................... 36
4.1 ........................................................................................................... 36
4.2 3........................................................................................ 36
4.2.1 s(t)...................................................................................... 36
4.2.2 s(t)........................................................... 39
4.2.3 s (t)........................................................ 40
4.2.4 ........................................................... 41
4.2.5 ................. 43
4.2.6 ................................................................... 45
........................................................................................... 48
1 MATLAB
, , , (), . , , .
MATLAB , , :
1. . :
Uo = 1;
f = 10;
theta = 0;
, ( ) :
t = 0:0.01:1;
xt = Uo*sin(2*pi*f*t+theta);
.
2. . , .. ,
s = 'Uo*sin(2*pi*f*t+theta)';
- eval:
xs = eval(s);
3. . -, . (inline-)
y = inline('sin(2*pi*f*t + theta)','t', 'f', 'theta')
:
Inline function: y(t,f,theta) = sin(2*pi*f*t + theta)
, ,
xg = y(t, f, 0)
4. -. . MATLAB (nargin) (nargout) , - .
function y = sinf(t,f,theta)
% y = sinf(t,f,theta)
% y = sinf(2*pi*f*t + theta)
if nargin = = 3
y = sinf(2*pi*f*t + theta);
elseif nargin = = 2
y = sinf(2*pi*f*t);
end
xf = sinf(t, f, theta);
, ,
xf = sinf(t, 10);
5. . , , (-, ) : , , , .
:
syms t f theta Uo
:
s = 'Uo*sin(2*pi*f*t+theta)';
ds = diff(s,'t')
(ds ):
ds = 2*Uo*cos(2*pi*f*t+theta)*pi*f,
. eval :
Uo = 1; theta = 0; t = 0:0.01:1;
xf = eval(s)
f , eval 101 :
xf =[0, sin(1/10*pi*f), sin(1/5*pi*f),..., sin(20*pi*f)]