Matlab程序：一元函数平面曲线
%二维图（一元函数图）%用法 plot(x,y,s) 其中x,y为向量，每一对分量代表一个数据点。
% s为表示颜色、连线和标记选择的字符串
%图形的线型，标记，颜色均可设定，常用有
% 颜色 | 线型 标记
% --------------------- --------------------------------------
% b 蓝(默认) - 实线(默认) 无(默认)
% g 绿 -- 虚线 * 星
% r 红 : 粗点线 . 点
% y 黄 -. 点划线 o 圈
% m 洋红 x 叉
% c 青 + 十字
% w 白 s 方块
% k 黑 d 菱形
% v 下三角形
% ^ 上三角形
% < 左三角形
% > 右三角形
% h 六角形
% p 五角形
%例如
% x=0:0.2:2*pi;y=sin(x);
% plot(x,y,'r*')
%
%PLOT Linear plot.
% PLOT(X,Y) plots vector Y versus vector X. If X or Y is a matrix,
% then the vector is plotted versus the rows or columns of the matrix,
% whichever line up.
%
% PLOT(Y) plots the columns of Y versus their index.
% If Y is complex, PLOT(Y) is equivalent to PLOT(real(Y),imag(Y)).
% In all other uses of PLOT, the imaginary part is ignored.
%
% Various line types, plot symbols and colors may be obtained with
% PLOT(X,Y,S) where S is a character string made from one element
% from any or all the following 3 colunms:
%
% y yellow . point - solid
% m magenta o circle : dotted
% c cyan x x-mark -. dashdot
% r red + plus -- dashed
% g green * star
% b blue s square
% w white d diamond
% k black v triangle (down)
% ^ triangle (up)
% < triangle (left)
% > triangle (right)
% p pentagram
% h hexagram
%
% For example, PLOT(X,Y,'c+:') plots a cyan dotted line with a plus
% at each data point; PLOT(X,Y,'bd') plots blue diamond at each data
% point but does not draw any line.
%
% PLOT(X1,Y1,S1,X2,Y2,S2,X3,Y3,S3,...) combines the plots defined by
% the (X,Y,S) triples, where the X's and Y's are vectors or matrices
% and the S's are strings.
%
% For example, PLOT(X,Y,'y-',X,Y,'go') plots the data twice, with a
% solid yellow line interpolating green circles at the data points.
%
% The PLOT command, if no color is specified, makes automatic use of
% the colors specified by the axes ColorOrder property.The default
% ColorOrder is listed in the table above for color systems where the
% default is yellow for one line, and for multiple lines, to cycle
% through the first six colors in the table.For monochrome systems,
% PLOT cycles over the axes LineStyleOrder property.
%
% PLOT returns a column vector of handles to LINE objects, one
% handle per line.
%
% The X,Y pairs, or X,Y,S triples, can be followed by
% parameter/value pairs to specify additional properties
% of the lines.
%
% See also SEMILOGX, SEMILOGY, LOGLOG, GRID, CLF, CLC, TITLE,
% XLABEL, YLABEL, AXIS, AXES, HOLD, COLORDEF, and SUBPLOT.
% If the NextPlot axes property is "replace" (HOLD is off), PLOT resets
% all axes properties, except Position, to their default values,
% deletes all axes children (line, patch, text, surface, and
% image objects), and sets the View property to .
% Copyright (c) 1984-98 by The MathWorks, Inc.
% $Revision: 5.7 $$Date: 1997/11/21 23:33:07 $
% Built-in function.
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