phase å angle å¨è¾å
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1. phase åªæ¯ææ éåä¸ç»´ï¼è¡ãåï¼åéè¾å
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2. 对äºåéè¾å
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Example 1: 1ç»´åé
g = [-1-1i -1+1i]; % 对åºè§åº¦ä¸º -3*pi/4 (=-2.3562) å 3*pi/4 (=-2.3562)
ang = angle(g)
pha = phase(g)
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è¾åºç»ææ¯ï¼
ang =
-2.3562 2.3562
pha =
-2.3562 -3.9270
å¾æ¾ç¶ï¼ç±äº 2.3562ä¸-2.3562çå·®å¼çç»å¯¹å¼è¶
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Example 2ï¼2ç»´ç©éµ
g = [-1-1i -1+1i; -1-1i -1+1i];
ang = angle(g)
pha = phase(g)
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ang =
-2.3562 2.3562
-2.3562 2.3562
Error using phase (line 17)
PHASE applies only to row or column vectors.
For matrices you have to decide along which dimension the
phase should be continuous.
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¥æ°æ®çè¾è§ï¼æ们åºè¯¥ç¨ angle å½æ°ãæ以ï¼å¯¹äºæ¥¼ä¸»ç代ç ï¼æå¥½å° phase æ¢æ angle å½æ°ã
æåï¼å»ºè®®æ¥¼ä¸»ç¨ edit angle å edit phase åå«æå¼angleåphase两个å½æ°ï¼ççå
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çå·®å«å°±ä¸ç®äºç¶äºãä¸é¢ç»åº angle å phase å½æ°çå
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% angle.m
function p = angle(h)
%ANGLE Phase angle.
% ANGLE(H) returns the phase angles, in radians, of a matrix with
% complex elements.
%
% Class support for input X:
% float: double, single
%
% See also ABS, UNWRAP.
% Copyright 1984-2010 The MathWorks, Inc.
% $Revision: 5.7.4.2 $ $Date: 2010/04/21 21:31:19 $
p = atan2(imag(h), real(h));
å¤å¶ä»£ç
% phase.m
function PHI=phase(G)
%PHASE Computes the phase of a complex vector
%
% PHI=phase(G)
%
% G is a complex-valued row vector and PHI is returned as its
% phase (in radians), with an effort made to keep it continuous
% over the pi-borders.
% L. Ljung 10-2-86
% Copyright 1986-2004 The MathWorks, Inc.
% $Revision: 1.5.4.2 $ $Date: 2004/07/31 23:24:49 $
%PHI = unwrap(angle(G));
[nr,nc] = size(G);
if min(nr,nc) > 1
error(sprintf(['PHASE applies only to row or column vectors.'...
'\nFor matrices you have to decide along which dimension the'...
'\nphase should be continuous.']))
end
if nr>nc
G = G.';
end
PHI=atan2(imag(G),real(G));
N=length(PHI);
DF=PHI(1:N-1)-PHI(2:N);
I=find(abs(DF)>3.5);
for i=I
if i~=0,
PHI=PHI+2*pi*sign(DF(i))*[zeros(1,i) ones(1,N-i)];
end
end
if nr>nc
PHI = PHI.';
end
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