How to use different markers for different X,Y pairs?

Question

Valeriy 2016-5-30

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/286489-how-to-use-different-markers-for-different-x-y-pairs

评论： Ali 2017-10-29

I'd like to have separated (X,Y) points, marked by different markers and legend that describes those points. When I use plot(x1,y1,'+',x2,y2,'o') I have error message. Solution with plot()... hold on; plot()... is not convenient because in such a case legend not shows all pairs information. Thanks for ideas.

4 个评论
显示 2更早的评论隐藏 2更早的评论

Valeriy 2016-5-30

编辑：dpb 2016-5-30

在 MATLAB Online 中打开

Thanks Josdph Cheng and Image Analyst for quick reply. Line

plot(RzACF.ACL(1),RzACF.Rz(1),'>','MarkerEdgeColor','y','MarkerFaceColor','m',...
     RzACF.ACL(2),RzACF.Rz(2),'<','MarkerEdgeColor','m','MarkerFaceColor','c'); 
produced next error message:
??? Error using ==> plot
String argument is an unknown option.

Line with suppressed color options works well:

plot(RzACF.ACL(1),RzACF.Rz(1),'>',RzACF.ACL(2),RzACF.Rz(2),'<');

I have a lot of X,Y pairs, so using different colors will be convenient and useful.

Ali 2017-10-29

在 MATLAB Online 中打开

if true
--------------------------------------------------- code start
This is an example for your case 
Input is "Input_Data", two dimension matrix 
Marker_Counter=1;
   figure6=figure;
   Markers = {'+','o','*','x','v','d','^','s','>','<'};
   for i=1:10:size(Input_Data,1)
    TPR=Input_Data(i:i+9,7);
    FPR=Input_Data(i:i+9,8);
plot(FPR,TPR,strcat('-',Markers{Marker_Counter}));
Marker_Counter=Marker_Counter+1;   
hold on
   end
plot([0.5 1],[0.5 1],'--');
legend('Minpts = 100','Minpts = 200','Minpts = 300','Minpts = 400','Minpts = 500','Minpts = 600','Minpts = 700','Minpts = 800','Minpts = 900','Minpts = 1000','','Location','SouthEast');
xlabel('FPR or (1-Specificity)','FontSize',12,'FontWeight','bold'); ylabel('TPR or Spensitivity)','FontSize',12,'FontWeight','bold');
title('ROC Space');
close(gcf);
-------------------------------------------- code end
end
--------------------------------------- picture link preview

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

Image Analyst 2016-5-30

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/286489-how-to-use-different-markers-for-different-x-y-pairs#answer_223910

在 MATLAB Online 中打开

Plot by using two separate calls to plot:

 plot(x1(1),y1(1),'>','MarkerEdgeColor','y','MarkerFaceColor','m');
 hold on
 plot(x2(2),y2(2),'<','MarkerEdgeColor','m','MarkerFaceColor','c');

or whatever - not sure exactly what is a point and what is an array with your x,y. But anyway, this works - I've tried it.

3 个评论
显示 1更早的评论隐藏 1更早的评论

Valeriy 2016-8-12

Thanks all. Both proposed methods work well, but there is question, how to provide legend to each of Xi, Yi pair?

Image Analyst 2016-8-12

在 MATLAB Online 中打开

Did you try the legend() function?

legend('This is (X1, Y1)', 'This is (X2, Y2)');

请先登录，再进行评论。

Answer 2

dpb 2016-5-30

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/286489-how-to-use-different-markers-for-different-x-y-pairs#answer_223908

编辑：dpb 2016-6-1

在 MATLAB Online 中打开

Can't use the named names multiple times in the same call, per the documentation: "Property name-value pairs apply to all the lines plotted. You cannot specify name-value pairs for each set of data."

You'll have to use

hL=plot(x1,y1,lspec1,x2,y2,lspec2,...);

then

set(hL,{'markerfacecolor'},{cell array of colors}, ...
       {'markeredgecolor'},{cell array of colors})

to do this it appears. NB: that to set multiple handles to different values you have to use cell arrays on both. This is documented at set with examples; it can get pretty complex, but is doable.

ADDENDUM

Just came to me that you can simplify just a tad by using the color in the linestyle string...

hL=plot(1.1,2.3,'>r',1.8,1.8,'<g');
xlim([1 2]), ylim([1 3])
set(hL,{'markerfacecolor'},{'r';'g'})

works and illustrates the cell array usage w/ set mentioned earlier.

set(hL,{'markerfacecolor'},{'r';'g'},'markeredgecolor','k')

is a variation when is single value with multiple handles.

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

Answer 3

Walter Roberson 2016-5-31

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/286489-how-to-use-different-markers-for-different-x-y-pairs#answer_224047

Property / Value pairs must be grouped together at the end. You cannot mix them with data. As soon as the first one is detected, it is assumed that everything after is a property / value pair.

1 个评论
显示 -1更早的评论隐藏 -1更早的评论

dpb 2016-6-1

I see even I quit reading too soon, Walter...it is documented near the very end of Description section: "Property name-value pairs apply to all the lines plotted. You cannot specify name-value pairs for each set of data."

So, my comment earlier of it being undocumented was in error...I'll amend that for the record.

请先登录，再进行评论。