arrow函数的作用是绘制一条带箭头的直线，该函数包括的箭头类型远比MATLAB自带的箭头功能强大。

举例：

arrow([1 2 3],[0 0 0],36,‘BaseAngle’,60)

该函数的直线起点为[1 2 3]，终点为[0 0 0]，箭头长度占据36个像素，夹角BaseAngle为60度，关于箭头参数的示意如下图所示。

MATLAB部分源码如下：

function [h,yy,zz] = arrow(varargin)

% ARROW Draw a line with an arrowhead.

%

% ARROW(Start,Stop) draws a line with an arrow from Start to Stop (points

% should be vectors of length 2 or 3, or matrices with 2 or 3

% columns), and returns the graphics handle of the arrow(s).

%

% ARROW uses the mouse (click-drag) to create an arrow.

%

% ARROW DEMO & ARROW DEMO2 show 3-D & 2-D demos of the capabilities of ARROW.

%

% ARROW may be called with a normal argument list or a property-based list.

% ARROW(Start,Stop,Length,BaseAngle,TipAngle,Width,Page,CrossDir) is

% the full normal argument list, where all but the Start and Stop

% points are optional. If you need to specify a later argument (e.g.,

% Page) but want default values of earlier ones (e.g., TipAngle),

% pass an empty matrix for the earlier ones (e.g., TipAngle=[]).

%

% ARROW(‘Property1’,PropVal1,‘Property2’,PropVal2,…) creates arrows with the

% given properties, using default values for any unspecified or given as

% ‘default’ or NaN. Some properties used for line and patch objects are

% used in a modified fashion, others are passed directly to LINE, PATCH,

% or SET. For a detailed properties explanation, call ARROW PROPERTIES.

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