增加 绘制 3D 散点图 方法.

Signed-off-by: rick.chan <chenyang@autoai.com>

Software/Applications/Octave/Octave_常用函数.md

@@ -4,4 +4,6 @@
 A=bitshift(A，k)    % 返回移位了 k 位的 A 的值。当 K>0 时左移，当 k<0 时右移。
 seconds=time()      % Return the current time as the number of seconds since the epoch.
 t=now()             % Return the current local date/time as a serial day number (see datenum). 
+% 绘制 3D 散点图 plot3(x, y, z)
+plot3([0,242.5,242.5,0,0,242.5,242.5,0],[45,45,21,21,9,9,9,9],[0,0,0,0,-9,-9,44.5,44.5],'x')
 ```