Only part of my plotted line will dash and how to add text to a line in the plot?

Question

Tomaszzz 2022-4-26

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1705455-only-part-of-my-plotted-line-will-dash-and-how-to-add-text-to-a-line-in-the-plot

评论： Voss 2022-4-29

采纳的回答： Johannes Hougaard

在 MATLAB Online 中打开

Hi all,

This code:

load('z_means'); load ('z_diffs'); load ('z_CR_ofmean')
figure ('color','w');    
plot(z_means,z_diffs,'sr', 'MarkerSize', 9)
hold on
%Plot lines
plot(z_means,zeros(1,length(z_means)),'r', 'LineWidth', 0.7); %%%plot zero 
plot(z_means, ones(1,length(z_means)).*z_CR_ofmean(1),'r--', 'LineWidth', 0.6); %%%plot the upper CR
plot(z_means, ones(1,length(z_means)).*z_CR_ofmean(2),'r--', 'LineWidth', 0.6); %%%plot the lower CR
% Add text 
text(z_CR_ofmean, [mynum2str(z_CR_ofmean(1)) ''],'HorizontalAlignment','left','VerticalAlignment','middle','fontsize',6);
text(z_means, [mynum2str(z_means,2) ''],'HorizontalAlignment','left','VerticalAlignment','middle','fontsize',6);
text(z_CR_ofmean, [mynum2str(z_CR_ofmean(2))''],'HorizontalAlignment','left','VerticalAlignment','middle','fontsize',6);

Produces this:

and the error:

Error using text
First two or three arguments must be numeric doubles.

Wheareas I want:

Dashed lines to be dashed throughout the whole lenght of the lines
Add text to each line correctly (can be any text as an example)

Data attached. Can you help please?

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Answer 1

Johannes Hougaard 2022-4-26

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1705455-only-part-of-my-plotted-line-will-dash-and-how-to-add-text-to-a-line-in-the-plot#answer_951430

在 MATLAB Online 中打开

Hi Tomaszzz

The reason some of the line is full and not dotted is that is it not the line as such but more a connection between two points - this often occurs when the data are not ordered.

You can fix the issue simply by sorting your x data

load('z_means'); load ('z_diffs'); load ('z_CR_ofmean')
figure ('color','w');    
plot(z_means,z_diffs,'sr', 'MarkerSize', 9)
hold on
%Plot lines
plot(sort(z_means),zeros(1,length(z_means)),'r--', 'LineWidth', 0.7); %%%plot zero 
plot(sort(z_means), ones(1,length(z_means)).*z_CR_ofmean(1),'r--', 'LineWidth', 0.6); %%%plot the upper CR
plot(sort(z_means), ones(1,length(z_means)).*z_CR_ofmean(2),'r--', 'LineWidth', 0.6); %%%plot the lower CR