matlab
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今天小编为大家带来matlab二维绘图
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Dear you,
This is the LearingYard Academy!
Today, the editor brings you matlab two-dimensional drawing
Welcome your visit!
This tweet usually takes about 5 minutes to read, please read it patiently.
#1 本期主题介绍
The topic of this issue
如果您了解过Matlab，
您肯定知道Matlab不只是计算！
Matlab还有一个强大的绘图功能！
本期话题将对matlab的二维图进行介绍。
请感兴趣的朋友和小编开启
学习Matlab的二维绘图之旅吧！
If you know Matlab,
You must know that Matlab is more than just computing!
Matlab also has a powerful drawing function!
The topic of this issue will introduce the two-dimensional map of matlab.
Please open it with interested friends and editors
Learn the journey of two-dimensional drawing in Matlab!
#2 Matlab二维绘图
Matlab two-dimensional drawing
1.绘制二维曲线
Draw a two-dimensional curve
plot函数的基本调用格式为：plot(x,y)
其中x和y为长度相同的向量，分别用于存储x坐标和y坐标数据；当x是实向量时，plot(x)以该向量元素的下标为横坐标，元素值为纵坐标画出一条折线图，当x为矩阵时，plot(x)以列为向量画出几条折线（矩阵列数）；当x,y是同维矩阵时，则以x,y对应列元素为横、纵坐标分别绘制曲线，曲线条数等于矩阵的列数。
The basic calling format of the plot function is: plot(x,y)
Where x and y are vectors of the same length, which are used to store x coordinate and y coordinate data respectively; when x is a real vector, plot(x) uses the subscript of the vector element as the abscissa, and the element value is the ordinate to draw A polyline graph, when x is a matrix, plot(x) draws several polylines (the number of matrix columns) with columns as vectors; when x and y are matrixes of the same dimension, the corresponding column elements of x and y are horizontal and Draw curves on the ordinate, and the number of curves is equal to the number of columns in the matrix
#3 Matlab 二维绘图实际操作
Matlab two-dimensional drawing actual operation
1.plot绘单条曲线图
plot draw a single curve graph
x=0:0.01*pi:2*pi;
y=sin(x);
plot(x,y)
2.plot绘制多条曲线图
plot plots multiple curves
格式为：plot(x,y1,x2,y2,......,xn,yn)
The format is: plot(x,y1,x2,y2,......,xn,yn)
以向量对的形式绘制曲线。
Draw curves in the form of vector pairs.
x=0:0.01*pi:2*pi;
y1=sin(x);
y2=sin(x-0.25*pi);
y3=sin(x-0.5*pi);
plot(x,y1,x,y2,x,y3)
plot(x,y1,'-.b',x,y2,'--r',x,y3,'-.gh')
%b代表的是蓝色，r为红色，gh为绿色
%b represents blue, r is red, gh is green
3.hold on 与 hold off的应用
Application of hold on and hold off
如果绘制一个曲线后，想要保持当前曲线不变，在当前曲线基础上绘制新的曲线，这时我们可以采用”hold on”，关闭时可以用”hold off"。
If you want to keep the current curve unchanged after drawing a curve, and draw a new curve based on the current curve, we can use "hold on" at this time, and use "hold off" when closing.
x=0:0.1:1;
y=x;
plot(x,y)
hold on
x=1:0.1:2;
y=0.5*x.^4 0.5;
plot(x,y)
hold on
x=2:0.1:5;
y=-x.^2 9*x-5.5;
plot(x,y)
hold off
4.绘制特殊的二维曲线，比如只想要描述点，而不想要线
Draw a special two-dimensional curve, such as only wanting to describe points, but not lines
x=0:pi/15:4*pi;
y=exp(2*cos(x));
plot(x,y,'r ')
5.绘制对数曲线
Draw a logarithmic curve
x=linspace(1,100,100);
y=exp(x);
loglog(x,y)
%这样就绘制了双对数曲线
%This draws a double logarithmic curve
x=linspace(1,100,100);
y=exp(x);
semilogy(x,y)
%Y为对数坐标轴
%Y is the logarithmic axis
x=linspace(1,100,100);
y=exp(x);
semilogx(x,y)
%x为对数坐标轴
%x is the logarithmic axis
6.fplot函数的应用
%flot函数的基本用法：fplot(f,lims,参数）
f代表一个函数，通常采用函数句柄的形式。lims为x轴的取值范围，默认值为[-5，5]。参数与plot函数相同。
Application of fplot function
The basic usage of %flot function: fplot(f, lims, parameter)
f represents a function, usually in the form of a function handle. lims is the value range of the x-axis, and the default value is [-5, 5]. The parameters are the same as the plot function.
xt = @(t) cos(3*t);
yt = @(t) sin(2*t);
fplot(xt,yt)
%fplot双输入函数的基本用法：fplot(funx,funy,tlims,参数)
funx、funy代表函数，通常采用函数句柄的形式，tlims为参数函数funx和funy得到自变量取值范围。
fplot(@(t) t.*sin(t), @(t) t.*cos(t))
The basic usage of %fplot dual input function: fplot(funx, funy, tlims, parameter)
funx and funy represent functions, usually in the form of a function handle, tlims is the parameter function funx and funy to get the value range of the independent variable.
fplot(@(t) t.*sin(t), @(t) t.*cos(t))
7.polarplot函数的应用
Application of .polarplot function
t=0:0.1*pi:4*pi;
a=abs(sin(2*t).*cos(2*t));
polarplot(t,a,'-b ')
8.绘制图形的辅助操作
%给图形添加标注
%title (图形标题）
title('图形标题','Color,'r','FontSize',24)
%xlable(x轴说明）
%ylable（y轴说明）
%text(x,y,图形说明）
%legend(图例)
x=linspace(0,2*pi,100);
y1=sin(x);
y2=sin(2*x);
plot(x,sin(x),x,sin(2*x))
legend('sin(x)','sin(3x)','sin(2x)')
9.坐标轴
Coordinate axis control控制
%axis[xmin,xmax,ymin,ymax,zmin,zmax]
%axis equal:纵横坐标轴次采用等长刻度
%axis square:产生正方形坐标系（默认为矩形）
%axis auto:使用默认设置
%axis off:不显示坐标轴
%axis on :显示坐标轴
%给坐标轴加网格
%grid on
%grid off
%grid
%给坐标系加边框
%box on
%bix off
%box
%图形保存
%hold on
%hold off
%hold
x=linspace(0,2*pi,100);
t=linspace(0,2*pi,100);
x=sin(t);
y=cos(t);
plot(x,y,'b')
hold on;
plot(2*x,2*y,'r ');
grid on
axis([-2.2,2.2,-2.2,2.2])
axis equal
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让我们相约明天，
祝您今天过得开心快乐！
That's it for today's sharing.
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Welcome to leave us a message,
Let us meet tomorrow,
I wish you a happy day today!
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参考资料：Google翻译、哔哩哔哩
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LearningYard学苑
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排版| Qian
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