下面是一段matlab程序，画曲线用的。 但不知道最后一句里的”--rs“是什么意思。请教一下大家了！

传递给plot的一个曲线绘制参数.

matlab help里有解释.我使用时一般亩哗都默认.

色彩字符颜色线型字符线型格式标记符局颤号数据点形式标记符号数据点迅腊行形式

y 黄- 实线. 点<小于号

m 紫： 点线o 圆s 正方形

c 青-. 点划线x 叉号d 菱形

r 红- - 虚线+ 加号h 六角星

g 绿* 星号p 五角星

b 蓝v 向下三角形

w 白^ 向上三角形

k 黑>大于号

>>help plot:

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. If X is a scalar and Y is a vector, disconnected

line objects are created and plotted as discrete points vertically at

X.

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 columns:

b blue . point - solid

g green o circle : dotted

r red x x-mark -.dashdot

c cyan + plus --dashed

m magenta * star (none) no line

y yellows square

k black d diamond

w white 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 pointPLOT(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. By default,

PLOT cycles through the colors in the ColorOrder property. For

monochrome systems, PLOT cycles over the axes LineStyleOrder property.

Note that RGB colors in the ColorOrder property may differ from

similarly-named colors in the (X,Y,S) triples. For example, the

second axes ColorOrder property is medium green with RGB [0 .5 0],

while PLOT(X,Y,'g') plots a green line with RGB [0 1 0].

If you do not specify a marker type, PLOT uses no marker.

If you do not specify a line style, PLOT uses a solid line.

PLOT(AX,...) plots into the axes with handle AX.

PLOT returns a column vector of handles to lineseries objects, one

handle per plotted line.

The X,Y pairs, or X,Y,S triples, can be followed by

parameter/value pairs to specify additional properties

of the lines. For example, PLOT(X,Y,'LineWidth',2,'Color',[.6 0 0])

will create a plot with a dark red line width of 2 points.

Example

x = -pi:pi/10:pi

y = tan(sin(x)) - sin(tan(x))

plot(x,y,'--rs','LineWidth',2,...

'MarkerEdgeColor','k',...

'MarkerFaceColor','g',...

'MarkerSize',10)

图像的左右、上下翻转，其本质是矩阵的左右、上下翻转，参照fliplr和flipup命令的信知使用 图像的叠加，就是矩阵的察咐加法（两图像的像素矩阵大小一致，否则要进行相应的拉伸压缩变滑没消换）

这段程卖缺滚序可以求得第一禁带的透射谱：

na=2.35 %A介质为硫化锌

nb=1.38 %B介质扮扮为二氟化镁

a=0.0000000357%中心波长为

600nm

b=0.0000001087

c=2.35

d=1.38

x=400:1:800

e=-2*pi*na*a./(x*0.000000001)

f=-2*pi*nb*b./(x*0.000000001)

num=length(e)

y=zeros(1,num)

for j=1:num

M=[cos(e(j)),i.*sin(e(j))./ci.*c.*sin(e(j)),cos(e(j))]

N=[cos(f(j)),i.*sin(f(j))./di.*d.*sin(f(j)),cos(f(j))]

H=M*N

T=H^10

F=[11]

E=T*F

B=E(1)

C=E(2)

rs=(B-C)/(B+C)

y(j)=1-(abs(rs))^2

end

plot(x,y,'k')

xlabel('波长')

ylabel(' 透射率'中余)

---