mArrow3 function and text in a 3D figure

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Franta Cymorek 2017-3-7

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https://ww2.mathworks.cn/matlabcentral/answers/328603-marrow3-function-and-text-in-a-3d-figure

评论： Franta Cymorek 2017-3-9

采纳的回答： Jan

在 MATLAB Online 中打开

I'm using the mArrow3 function, but it does not work always, ussually not. The code:

 hold on;
 mArrow3([0 0 0],[1 0 0],'lineWidth',0.0000002,'color','red','facealpha',0.05);
 mArrow3([0 0 0],[0 1 0],'lineWidth',0.0000002,'color','red','facealpha',0.05);
 mArrow3([0 0 0],[0 0 1],'lineWidth',0.0000002,'color','red','facealpha',0.05);
 hold off

Could you please give me any hint? It doesn't show any errors, just doesn't appear for most of the time. But on it's own it just works fine.

One more question, do you know how to put titles to X, Y and Z directions? I mean appearing it just next to the arrows.

Now about the text command. I need to put three different texts in three different places - with just text command I put everywhere the same text. Is there any similar command to the text command?

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Jan 2017-3-7

I assume you mean https://www.mathworks.com/matlabcentral/fileexchange/25372-marrow3-m-easy-to-use-3d-arrow. Please note, that this is not obvious.

Franta Cymorek 2017-3-7

I have downloaded the function and it's not working properly, that's the reason I am asking here.

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采纳的回答

Jan 2017-3-7

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/328603-marrow3-function-and-text-in-a-3d-figure#answer_257720

What exactly does "most of the time" mean? Please post some code, which reproduce the problem.

The lineWidth of 0.0000002 is very small. My first idea is, that the arrow is not visible, because it is far to thin. Did you try it with something less slender?

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Franta Cymorek 2017-3-7

编辑：Franta Cymorek 2017-3-8

在 MATLAB Online 中打开

The code:

 function [pointsQRS, pointsP, pointsT] = VCG (pointsQRS,pointsP,pointsT)
%pro popis principu funkce viz VCG_QRS
figure(2)
hold on
 for i=2:size(pointsQRS,1)
    if mod(i,2)==0
        QRS=plot3(pointsQRS([i-1:i],1),pointsQRS([i-1:i],2),pointsQRS([i-1:i],3),'-k');
    else
        plot3(pointsQRS([i-1:i],1),pointsQRS([i-1:i],2),pointsQRS([i-1:i],3),'-g');
    end
end
 for i=2:size(pointsT,1)
    if mod(i,2)==0
        T=plot3(pointsT([i-1:i],1),pointsT([i-1:i],2),pointsT([i-1:i],3),'-b');
    else
        plot3(pointsT([i-1:i],1),pointsT([i-1:i],2),pointsT([i-1:i],3),'-g');
    end
end
 for i=2:size(pointsP,1)
    if mod(i,2)==0
         P=plot3(pointsP([i-1:i],1),pointsP([i-1:i],2),pointsP([i-1:i],3),'-r');
    else
        plot3(pointsP([i-1:i],1),pointsP([i-1:i],2),pointsP([i-1:i],3),'-g');
    end
end
 view(3)
 grid on
 hold on;
 mArrow3([0 0 0],[1 0  0],'lineWidth',0.002,'color','red','facealpha',0.05);
 mArrow3([0 0 0],[0 1  0],'lineWidth',0.002,'color','red','facealpha',0.05);
 mArrow3([0 0 0],[0 0   1],'lineWidth',0.002,'color','red','facealpha',0.05);
 hold off

Yep, I have tried it, didn't work out. What is wrong with the code? As well, do you know how to put a comment to each tip of an arrow? I have tried the text command, but didn't wokr. I mean 3 different comments.