如何在MATLAB的每次迭代中更改图的颜色? [英] How can I change the color of the plot in each iteration in MATLAB?

问题描述

以下是我的matlab代码的一部分.如图所示，我想在一张图中绘制8条曲线.但是我想使每条曲线具有一种独特的颜色.我还想更改图例，以便每个i都更改.

The following is a part of my matlab code. As it's shown, I would like to plot 8 curves in one plot. But I want to make each curve with one unique color. I also want to change the legend so that it changes for each i.

例如，对于i = 1，图例将是gho-1，对于i = 2 gho-2，依此类推.我希望它是自动的，因为有时会从ex:(i = 1:20)更改i.

For instance, for i=1 the legend will be gho-1, for i=2 gho-2 and so on. I want it to be automatic because I will change the i sometimes from ex:(i=1:20).

for i=1:8
.
.
.
plot(b,r,'b');
legend(['qho-',num2str(i)]);    
hold on
end

我该怎么做?

再见，

我还有其他问题: 如果我有以下内容

I have other question: if I have the following

for i=1:8
.
b1=(1:3,:)
b2=(3:6,:)
figure(1);plot(b1,r,'*');
figure(2);plot(b2,r,'*');

Leg{i} = ['qho-',num2str(i)];    

end
legend(Leg)

我只有最后一个数字的颜色图例.不能两者都用. 我该怎么解决?！

I got only color legend for the last figure only. not for both.. how can I solve that ?!

再次感谢

推荐答案

只需使用hold all而不是hold on并将图例标签放在单元格数组中

Just use hold all instead of hold on and put the legend labels in a cell array

hold all
for i=1:8
    .
    .
    .
    plot(b,r);

    Leg{i} = ['qho-',num2str(i)];    

end
legend(Leg)

例如，请参见以下问题:稀疏矩阵图matlab

See this question for example: Sparse matrix plot matlab

注意:

从 Matlab R2014b起，hold on已被修改为类似于hold all的行为，即，每次绘制时都更改图的颜色. 文档指出hold all语法将在将来的版本中删除.

From Matlab R2014b onward, hold on has been modified to act like hold all, i.e. change the colours of the plots each time one is plotted. The docs state that the hold all syntax will be removed in future releases.

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