Correctly plot the quiver on a figure

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sparsh garg 2021-9-15

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https://ww2.mathworks.cn/matlabcentral/answers/1453429-correctly-plot-the-quiver-on-a-figure

评论： sparsh garg 2021-9-15

I am currently trying to project the point along the direction of the normals.However my current method tends to project them in a diagonal manner.

The original img

Now i use this code to ensure that my points are displayed in correct order(Note I can always do set(gca'YDir','reverse') )

plot(Fp(1,:),max(Fp(2,:))+1-Fp(2,:));
%plot(E_stroke(1,:),max(E_stroke(2,:))+1-E_stroke(2,:));
%plot(FP1(1,:),max(FP1(2,:))+1-FP1(2,:));
axis equal;
ax=gca;
h = findobj(gca,'Type','line');
x = h.XData; 
y = h.YData;
Final_set_pts=[x;y];

After this when I plot the normals I get this figure,any idea what is happening here

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KSSV 2021-9-15

在 MATLAB Online 中打开

Dot indexing is not supported for variables of this type.
Error in file (line 3)
quiver(edges2.x+edges2.nx,edges2.y+edges2.ny,-edges2.nx,-edges2.ny);

sparsh garg 2021-9-15

oh okay that is b'cause the edgepixel is a structure but when I upload it and send it to someone else,it comes out as a a simple matrix.

edge_norm is nothing but [edgees2.nx,edges2.ny] and edge_pos is [edges2.x,edges2.y];

Also how do we go about saving classdef objects in matlab so that when you send them as attachments,the end person recieves that object in the right format.

For example edges2.mat is a object which somehow got converted into a matrix.

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