带标签的Matlab绘图

我试图从我的数据中绘制knn结果，它有3列：x，y，label。有3个类，我想为每个类使用不同的符号。下面是我现在正在策划的方式：

t1 = data(:,3) == 1;
t2 = data(:,3) == 2;
t3 = data(:,3) == 3;

train1 = data(t1,:);
train2 = data(t2,:);
train3 = data(t3,:);

figure(1);

plot(train1(:,1),train1(:,2),'#',train2(:,1),train2(:,2),'*',train3(:,1),train3(:,2),'o');

我想知道是否有一种更简洁的方法。谢谢

以下是绘制数据最简洁（最有效）的方法：

figure(1);
hold all
plot(train1(:,1),train1(:,2),'o')
plot(train2(:,1),train2(:,2),'x')
plot(train3(:,1),train3(:,2),'s')

下面是一个以健壮和模块化的方式实现您想要的功能的示例。您可以轻松地添加类或修改地物输出

data = [0.53,0.17,2;0.78,0.60,3;0.93,0.26,1;0.13,0.65,2;0.57,0.69,1;...
        0.47,0.75,3;0.010,0.45,1;0.34,0.080,3;0.16,0.23,3;0.79,0.91,3;...
        0.31,0.15,1;0.53,0.83,2];

categories = [1,2,3];
symbols = {'s','<','o','d','v','+','x','*'};
figure;
hold all
for loopj = 1:length(categories)
    t = data(:,3) == categories(loopj);
    train = data(t,:);
    label = strcat('Class ',num2str(categories(loopj)));
    plot(train(:,1),train(:,2),symbols{loopj},'DisplayName',label,'LineWidth',1.3)
end
lg = legend('show');
lg.Location = 'best';

data=[0.53,0.17,2；0.78,0.60,3；0.93,0.26,1；0.13,0.65,2；0.57,0.69,1；。。。
0.47,0.75,3;0.010,0.45,1;0.34,0.080,3;0.16,0.23,3;0.79,0.91,3;...
0.31,0.15,1;0.53,0.83,2];
类别=[1,2,3]；
symbols={s'，'以下是绘制数据的最简洁（最有效）的方法：

figure(1);
hold all
plot(train1(:,1),train1(:,2),'o')
plot(train2(:,1),train2(:,2),'x')
plot(train3(:,1),train3(:,2),'s')

下面是一个以健壮和模块化的方式实现所需功能的示例。您可以轻松添加类或修改图形输出

data = [0.53,0.17,2;0.78,0.60,3;0.93,0.26,1;0.13,0.65,2;0.57,0.69,1;...
        0.47,0.75,3;0.010,0.45,1;0.34,0.080,3;0.16,0.23,3;0.79,0.91,3;...
        0.31,0.15,1;0.53,0.83,2];

categories = [1,2,3];
symbols = {'s','<','o','d','v','+','x','*'};
figure;
hold all
for loopj = 1:length(categories)
    t = data(:,3) == categories(loopj);
    train = data(t,:);
    label = strcat('Class ',num2str(categories(loopj)));
    plot(train(:,1),train(:,2),symbols{loopj},'DisplayName',label,'LineWidth',1.3)
end
lg = legend('show');
lg.Location = 'best';

data=[0.53,0.17,2；0.78,0.60,3；0.93,0.26,1；0.13,0.65,2；0.57,0.69,1；。。。
0.47,0.75,3;0.010,0.45,1;0.34,0.080,3;0.16,0.23,3;0.79,0.91,3;...
0.31,0.15,1;0.53,0.83,2];
类别=[1,2,3]；
符号={s'，'