MATLAB中plot函数和line函数作用有区别吗？

Posted 2023-05-02

两个函数的格式不同：\x0d\x0aplot(X,Y,S); % X,Y为坐标，画出一个点，S为其它属性（颜色，点的大小等）。\x0d\x0aline([X1 X2],[Y1 Y2],S); %点A(X1,Y1)和点B(X2 Y2)之间画一条直线，S为其它属性（颜色，线的粗细等）。\x0d\x0a详细资料可以在matlab主面板里输入 "help plot" 和 "help line". 参考技术A 两个函数的格式不同：
plot(X,Y,S); % X,Y为坐标，画出一个点，S为其它属性（颜色，点的大小等）。
line([X1 X2],[Y1 Y2],S); %点A(X1,Y1)和点B(X2 Y2)之间画一条直线，S为其它属性（颜色，线的粗细等）。
详细资料可以在matlab主面板里输入 "help plot" 和 "help line".本回答被提问者和网友采纳 参考技术B 前者画图，后者只画线。

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, length(Y)
disconnected points are plotted.

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 yellow s square
k black d diamond
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 blue 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.

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.

Backwards compatibility
PLOT('v6',...) creates line objects instead of lineseries
objects for compatibility with MATLAB 6.5 and earlier.

LINE Create line.
LINE(X,Y) adds the line in vectors X and Y to the current axes.
If X and Y are matrices the same size, one line per column is added.
LINE(X,Y,Z) creates lines in 3-D coordinates.

LINE returns a column vector of handles to LINE objects,
one handle per line. LINEs are children of AXES objects.

The X,Y pair (X,Y,Z triple for 3-D) can be followed by
parameter/value pairs to specify additional properties of the lines.
The X,Y pair (X,Y,Z triple for 3-D) can be omitted entirely, and
all properties specified using parameter/value pairs.

Execute GET(H), where H is a line handle, to see a list of line
object properties and their current values. Execute SET(H) to see a
list of line object properties and legal property values. 参考技术C 1.private与子函数：
子函数只能在主函数内容中调用，在函数外无法使用
function MainFunction
%主函数内容
function SubFunction1
%子函数内容
end
function SubFunction2
%子函数内容
end
function SubFunction3
%子函数内容
end
end
private函数是matlab软件中广泛使用的一种技术，其作用是限定某一些函数（private文件夹内）只能被令一些函数（private文件夹所在文件夹中的函数）使用，其他函数不能使用，这样的话就可以避免一些无用（因为一般的matlab函数是全局可见的，而private函数只能被private文件夹所在文件夹中的函数调用。
2.ezplot和fplot
ezplot是easy plot的简称，意思就是简化画图，只需给出函数体而无需变量范围，例如想画个圆，用ezplot就很方便：
syms x y
ezplot('x^2+y^2=1',[-1.5 1.5],[-1 1])
fplot的意思是function plot，就是画某一函数的曲线。顾名思义,若要画一条函数的曲线，只要给出函数名和自变量范围即可,例子如下：
fplot('sin',[-2 2])

matlab中plot和polyval、polyfit用于啥函数。

plot是画图函数
polyval是求值函数
polyfit是曲线拟合函数
polyfit用于多项式曲线拟合
p=polyfit(x,y,m)
其中, x, y为已知数据点向量, 分别表示横,纵坐标, m为拟合多项式的次数, 结果返回m次拟合多项式系数, 从高次到低次存放在向量p中.
y0=polyval(p,x0)
可求得多项式在x0处的值y0 参考技术A plot是画图函数
polyval是求值函数
polyfit是曲线拟合函数
polyfit用于多项式曲线拟合
p=polyfit(x,y,m)
其中, x, y为已知数据点向量, 分别表示横,纵坐标, m为拟合多项式的次数, 结果返回m次拟合多项式系数, 从高次到低次存放在向量p中.
y0=polyval(p,x0)
可求得多项式在x0处的值y0