关于matlab中phase函数和angle函数的区别
我用两种算法计算一个多输入多输出模型的传递函数得到结果（两组复数序列，分别对应两种算法的结果，分别记作H1_ij，Hv_ij，），分别对比两组复数序列实部和虚部，发现都能完全吻合。当用phase函数分别求这两组复数序列的相位时，发现当ij不同时，phase(H1_ij)和phase(Hv_ij)有时同相，有时相位差2pi，而angle(H1_ij)和angle(Hv_ij)则计算出的结果始终完全吻合。因此向各位大侠请教phase函数和angle函数的区别，望不吝赐教，谢谢回复！1.若有附加图形可能别人比较容易了解LZ说的问题
2.详看下help, 应该会有说明
3.若想进一步了解并确定, 或许可以直接看下该函数(使用edit)
4.google下, ref: http://stackoverflow.com/questions/12811401/difference-between-phase-and-angle-command-in-matlab 想想应该直接贴上好像比较好
Matlab help for phase
PHASEComputes 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.Matlab help for angle
ANGLEPhase angle.
ANGLE(H) returns the phase angles, in radians, of a matrix with
complex elements.
Class support for input X:
float: double, single
At first, ANGLE command is from MATLAB core, PHASE from system identification toolbox.
ANGLE command always give result in range [-pi, pi].
PHASE command is more complex. If you have two adjacent points in input vector with phase near pi, for example
X=[-1+0.1i -1-0.1i]phase(X) command will give answer greater than pi for the second value (difference between phases values should be less than pi).
At this time angle(X) command will give value near -pi for the second argument (wrap values into range [-pi, pi]). E.g.
phase(X(2)) = angle(X(2)) + 2*pi
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