多个图的pzmap或pzplot颜色句柄 [英] pzmap or pzplot color handle for multiple plots

问题描述

我正在使用 pzmap.m 或 pzplot.m 中的任意一个绘制系统的闭环极点.我想在更改由 L 表示的变量时看到极点和零点的运动.

I am plotting a closed loop poles of a systems using pzmap.m or pzplot.m whichever you prefer. I want to see the movement of poles and zeros as I change a variable depicted by L.

该功能没有颜色的直接句柄.在示例中，您只能选择标准颜色，而不能给出自己的颜色.由于必须在同一图形上绘制多次，因此我为 for 循环中的每次迭代创建一个句柄，并使用 findobj 设置曲线的颜色.为了获得颜色，我想要一个 colorbar .因此，我使用 jet 来获取图形的颜色分布.但是市场规模保持不变，而且我有一个难看的数字.

The function does not have a direct handle for color. In the example you can just choose the standard colors but cannot give your own color. Since I have to plot multiple times on the same figure, I create a handle for every iteration in a for loop and use findobj to set the color of the curve. To get the colors I want to have a colorbar. So I use jet to get the color distribution for my graph. But the market size stays the same and I have one ugly looking figure.

MWE:

cb=jet(10);
s=tf('s');
L_array=5:5:50;

figure; hold on;
for i=1:length(L_array)
    L=L_array(i);
    G=((58.2+11.7*L)*s^2*25^2+(3996.8 + 815.7*L)*s*25+815.7*25^2)/(s^2*(s^2*25^2+126.9*s*25+(3996.8+1.9*25^2)));
    CL=feedback(G,1);
    pzmap(CL);
    h = findobj(gcf,'type','point'); set(h,'markers',12,'color',cb(i,:));
    clear L G CL h
end
grid;
c=colorbar
c.Label.String = 'L'

如果运行它，您会发现大小没有改变，并且图形看起来很疯狂，并且y轴的两侧都标有刻度.我想要一个合适的 colorbar (从蓝色到红色)，并且颜色分配正确，但是多次尝试后却无法获得它.如果我可以减少混乱，那也会有所帮助.

If you run it you'll see that the size doesn't change and graph looks crazy with the y axis on either side labelled with ticks. I want a proper colorbar from blue to red and the colors distributed properly but can't get it after multiple tries. If I can get less cluttering that would be helpful too.

推荐答案

代码中有几个问题

• h = findobj(gcf,'type','point');屏幕上绘制的内容实际上是'line'类型！
• 每次迭代时，您都会捕获所有点，并在删除属性后以明确的方式对其进行修改.

• h = findobj(gcf,'type','point'); The things drawn in the screen are actually of type 'line'!
• Every iteration, you catch all the points, modify them an dimdediately after delete the properties with clear.

此外，h = findobj(gcf,'type','line');不会返回任何东西，而是返回它们的集合，因此您需要对其进行索引以设置属性.我修改后的代码工作如下:

Additionally, h = findobj(gcf,'type','line'); will not return a single thing, but a set of them, so you need to index through it to set the properties. My modified code working looks like this:

clear;clc
cb=parula(10);
s=tf('s');
L_array=5:5:50;

figure; hold on;
for i=1:length(L_array)
    L=L_array(i);
    G=((58.2+11.7*L)*s^2*25^2+(3996.8 + 815.7*L)*s*25+815.7*25^2)/(s^2*(s^2*25^2+126.9*s*25+(3996.8+1.9*25^2)));
    CL=feedback(G,1);
    pzmap(CL);

end

% lets do this in the end!

% you will have length(L_array)*2 +1 items in h
 h = findobj(gca,'type','line'); 
for jj=2:length(h)
        set(h(jj),'MarkerSize',12,'Color',cb(floor(jj/2),:));
end
grid;

colormap(parula);   % I am using parula, you can use jet, but I discourage it
c=colorbar;

PD:有很多原因不使用jet！请使用可感知的统一颜色图！

PD: there are tons of reasons not to use jet!! Use perceptually uniform colormaps please!

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