1、feather函数：绘制羽毛图（速度向量图）
2、用法说明：
（1）feather(x,y) 函数绘制由向量参量x与y构成的速度向量，沿水平轴方向，从均匀间隔点以箭头发射出来；
（2）feather(z) 函数绘制羽毛图。参量z是一个复数，则feather(z)相当于compass(real(z)，imag(z))；
（3）feather(...,LineSpec) 函数绘制羽毛图。参量LineSpec指定的线型、标记符号、颜色等属性画出羽毛图；
（4）H = feather(...) 函数返回羽毛图中线型对象的句柄H。
3、举例说明
（1）feather(x,y)
a、源码
>> x = rand(50,1)
x =
0.8147
0.9058
0.1270
0.9134
0.6324
0.0975
0.2785
0.5469
0.9575
0.9649
0.1576
0.9706
0.9572
0.4854
0.8003
0.1419
0.4218
0.9157
0.7922
0.9595
0.6557
0.0357
0.8491
0.9340
0.6787
0.7577
0.7431
0.3922
0.6555
0.1712
0.7060
0.0318
0.2769
0.0462
0.0971
0.8235
0.6948
0.3171
0.9502
0.0344
0.4387
0.3816
0.7655
0.7952
0.1869
0.4898
0.4456
0.6463
0.7094
0.7547
>> y = rand(50,1)
y =
0.2760
0.6797
0.6551
0.1626
0.1190
0.4984
0.9597
0.3404
0.5853
0.2238
0.7513
0.2551
0.5060
0.6991
0.8909
0.9593
0.5472
0.1386
0.1493
0.2575
0.8407
0.2543
0.8143
0.2435
0.9293
0.3500
0.1966
0.2511
0.6160
0.4733
0.3517
0.8308
0.5853
0.5497
0.9172
0.2858
0.7572
0.7537
0.3804
0.5678
0.0759
0.0540
0.5308
0.7792
0.9340
0.1299
0.5688
0.4694
0.0119
0.3371
>> feather(x,y)
（2）feather(z)
a、源码
>> z = 1 + 2i
z =
1.0000 + 2.0000i
>> feather(z)
（3）feather(...,LineSpec)
a、源码
feather(x,y,':')
（4）H = feather(...)
a、源码
>> H = feather(x,y,':')
H =
174.0054
175.0015
176.0013
177.0013
178.0013
179.0013
180.0013
181.0013
182.0013
183.0013
184.0013
185.0013
186.0013
187.0013
188.0013
189.0013
190.0013
191.0013
192.0013
193.0013
194.0013
195.0013
196.0013
197.0013
198.0013
199.0013
200.0013
201.0013
202.0013
203.0013
204.0013
205.0013
206.0013
207.0013
208.0013
209.0013
210.0013
211.0013
212.0013
213.0013
214.0013
215.0013
216.0013
217.0013
218.0013
219.0013
220.0013
221.0013
222.0013
223.0013
224.00134、附录
>> help feather
feather Feather plot.
feather(U,V) plots the velocity vectors with components U and V as
arrows emanating from equally spaced points along a horizontal axis.
feather is useful for displaying direction and magnitude data that
is collected along a path.
feather(Z) for complex Z is the same as feather(REAL(Z),IMAG(Z)).
feather(...,'LineSpec') uses the color and linestyle specification
from 'LineSpec' (see PLOT for possibilities).
feather(AX,...) plots into AX instead of GCA.
H = feather(...) returns a vector of line handles.
Example:
theta = (-90:10:90)*pi/180; r = 2*ones(size(theta));
[u,v] = pol2cart(theta,r);
feather(u,v), axis equal
See also compass, rose, quiver.
Overloaded methods:
gpuArray/feather
Reference page in Help browser
doc feather