matlab hold on

The "hold on" command in MATLAB is used to retain the current plot while adding new plots to the same figure. It allows you to plot multiple lines or objects on the same graph without erasing the previous plot.

For example, if you have plotted a line using the "plot" command, and you want to add another line to the same plot, you can use the "hold on" command to prevent the previous plot from being erased. The syntax for using the "hold on" command is:

hold on

After executing this command, any subsequent plot commands will add to the existing plot without erasing it. To turn off the hold on mode, you can use the "hold off" command.

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MATLAB hold on

The "hold on" command in MATLAB is used to retain the current plot and add new plots to the same figure.

For example, if you have plotted a graph using the "plot" command and you want to add another plot to the same graph, you can use the "hold on" command before plotting the new data.

Here is an example:

x = 0:0.1:2*pi;
y1 = sin(x);
y2 = cos(x);

plot(x, y1);
hold on;
plot(x, y2);

In this example, the first plot command will plot the sine function and the "hold on" command will retain the current plot. The second plot command will plot the cosine function on the same graph as the sine function.

Without the "hold on" command, the second plot command would create a new figure and plot the cosine function on a separate graph.

Note that you can turn off the "hold on" behavior using the "hold off" command.

matlab hold on画三条线

好的，以下是 MATLAB 代码，可以用 hold on 命令画出三条线：

% 生成数据
x = 0:0.1:2*pi;
y1 = sin(x);
y2 = cos(x);
y3 = tan(x);

% 画图
figure;
hold on;
plot(x, y1, 'r');
plot(x, y2, 'g');
plot(x, y3, 'b');
xlabel('x');
ylabel('y');
legend('sin(x)', 'cos(x)', 'tan(x)');

这段代码会生成一个包含三条线的图像，其中红色线表示 sin(x)，绿色线表示 cos(x)，蓝色线表示 tan(x)。同时，使用了 xlabel、ylabel 和 legend 命令添加了坐标轴标签和图例。