function?[hyyzz]?=?arrow（varargin）
%?ARROW??Draw?a?line?with?an?arrowhead.
%
%??ARROW（StartStop）?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（StartStopLengthbaseAngleTipAngleWidthPageCrossDir）?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.
%
%????????Start?????????The?starting?points.?????????????????????B
%????????Stop??????????The?end?points.?????????????????????????/|\???????????^
%????????Length????????Length?of?the?arrowhead?in?pixels.?????/|||\??????????|
%????????baseAngle?????base?angle?in?degrees?（ADE）.??????????//|||\\????????L|
%????????TipAngle??????Tip?angle?in?degrees?（ABC）.??????????///|||\\\???????e|
%????????Width?????????Width?of?the?base?in?pixels.????????////|||\\\\??????n|
%????????Page??????????Use?hardcopy?proportions.??????????/////|D|\\\\\?????g|
%????????CrossDir??????Vector?||?to?arrowhead?plane.?????////??|||??\\\\????t|
%????????NormalDir?????Vector?out?of?arrowhead?plane.???///????|||????\\\???h|
%????????Ends??????????Which?end?has?an?arrowhead.?????//<----->||??????\\???|
%????????objectHandles?Vector?of?handles?to?update.???/???base?|||????????\??V
%????????????????????????????????????????????????????E????angle||<-------->C
%??ARROW（H‘Prop1‘PropVal1...）?where?H?is?a?????????????????|||tipangle
%????????vector?of?handles?to?previously-created?arrows????????|||
%????????and/or?line?objects?will?update?the?previously-??????|||
%????????created?arrows?according?to?the?current?view???????-->|A|<--?width
%????????and?any?specified?properties?and?will?convert
%????????two-point?line?objects?to?corresponding?arrows.??ARROW（H）?will?update
%????????the?arrows?if?the?current?view?has?changed.??Root?figure?or?axes
%????????handles?included?in?H?are?replaced?by?all?descendant?Arrow?objects.
%
%??A?property?list?can?follow?any?specified?normal?argument?list?e.g.
%??ARROW（[1?2?3][0?0?0]36‘baseAngle‘60）?creates?an?arrow?from?（123）?to
%??the?origin?with?an?arrowhead?of?length?36?pixels?and?