分享兴趣，传播**，增长见闻，留下美好！亲爱的您，这里是LearningYard学苑。

今天小编为大家带来MATLAB二维绘图（2），欢迎您的用心访问！本期推文时长大约4分钟，请您耐心阅读。

Share interest, spread happiness, increase knowledge, and leave beautiful. Dear, this is the Learing Yard Academy!

Today, the editor brings the MATLAB two-dimensional drawing (2). Welcome to visit! This tweet usually takes about 4 minutes to read. Please read patiently.

上一期，小编和大家一起了解了如何用MATLAB软件绘制简单线图，这期，一起来学习一下其他二维图的绘制吧~

In the last issue, the editor and everyone learned how to draw simple line graphs with MATLAB software. In this issue, let's learn about the drawing of other two-dimensional graphs~

01.简单饼图的绘制

Drawing a simple pie chart

绘制饼图，我们需要使用的是pie函数。pie（x）是指使用x中数据绘制饼图，x中的数据数量决定着饼图中的扇形数量。

我们输入：

x=[1 2 4 6 3];

pie(x)

To draw a pie chart, we need to use the pie function. pie(x) refers to using the data in X to draw a pie chart. The number of data in x determines the number of sectors in the pie chart.

We enter:

x=[1 2 4 6 3];

pie(x)

则会**一个标有百分比的饼图，其中，x**有5个数据，所以饼图被分成了5部分。

You will get a pie chart marked with percentages, where there are 5 data in x, so the pie chart is divided into 5 parts.

x中数据的数值与饼图中的面积是怎么对应的呢？

由于x的数据加和sum（x)>1, pie会通过x/sum(x)计算出各个数据所占的比值，来确定相对应的扇形的面积。

How does the value of the data in x correspond to the area in the pie chart?

Since the data sum of x is sum(x)>1, pie will calculate the ratio of each data through x/sum(x) to determine the area of the corresponding sector.

如果我们要在饼图中添加各个部分的标签，应该怎么做呢？

我们输入：

x=[1 2 4 6 3];

labels={'其他','培养独立能力','缓解压力','欣赏风景','广交朋友'};

pie(x,labels)

What if we want to add labels for each part in a pie chart?

We enter: x=[1 2 4 6 3];

labels={'other','cultivating independence','relieving stress','appreciating the scenery','making friends'};

pie(x, labels)

会**如下饼图：

The following pie chart will be obtained:

此时，我们需要注意数据与标签的一一对应，可以在工作区进行查看。

At this point, we need to pay attention to the one-to-one correspondence between data and labels, which can be viewed in the workspace.

02.简单散点图的绘制

Drawing a simple scatter plot

绘制散点图，我们使用的是scatter函数，scatter（x,y）中，（x,y）我们可以理解为是一个坐标点，在这个坐标点的位置创建圆形标记散点图。我们输入：

x=linspace(0,4*pi,200);

y=sin(x);

scatter(x,y)

To draw a scatter chart, we use the scatter function. In scatter(x, y), (x, y) can be understood as a coordinate point, and a circular marker scatter chart is created at the position of this coordinate point. We enter:

x=linspace(0,4*pi,200);

y=sin(x);

scatter(x,y)

会**如下图形，这部分与线图类似，可以理解为线图的散点图形式。

The following graph will be obtained. This part is similar to the line graph and can be understood as the scatter graph form of the line graph.

散点图的类型有许多，小编就不一一介绍了。部分类型的对应代码和图形示例如下：

There are many types of scatter plots, and I will not introduce them one by one. Some types of the corresponding code and graphic examples are as follows:

03.简单极坐标图的绘制

Drawing a simple polar plot

绘制极坐标图，我们使用的是polarplot函数，polarplot（theta,rho）中，theta表示的是弧度角，rho表示每个点的半径值。

我们输入：

theta=0:0.01:2*pi;

rho=sin(3*theta).*cos(2*theta);

polarplot(theta,rho)

会**：

To draw a polar coordinate graph, we use the polarplot function. In polarplot(theta, rho), theta represents the angle in radians, and rho represents the radius value of each point.

We enter:

theta=0:0.01:2*pi;

rho=sin(3*theta).*cos(2*theta);

polarplot(theta,rho)

will get:

其中“.*”的含义是点乘。

Among them, ".*" means dot product.

我们还可以在极坐标轴中绘制两条线，输入：

theta = linspace(0,6*pi);

rho1 = theta/10;

polarplot(theta,rho1)

rho2 = theta/12;

hold on

polarplot(theta,rho2,'--')

hold off

We can also draw two lines in the polar axis by typing:

theta = linspace(0,6*pi);

rho1 = theta/10;

polarplot(theta,rho1)

rho2 = theta/12;

hold on

polarplot(theta,rho2,'--')

hold off

其他图形de绘制，敬请期待......

END

今天的分享就到这里了，如果您对文章有独特的想法，欢迎给我们留言。让我们相约明天，祝您今天过得开心**！

That's all for today's sharing. If you have a unique idea about the article, please leave us a message, and let us meet tomorrow. I wish you a happy day!

参考资料：谷歌翻译、百度

本文由LearningYard学苑整理并发出，如有侵权请在后台留言沟通！

Learning Yard 学苑

文案｜Rue

排版｜Rue

审核｜圈儿