Drawing line through scatter plot

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Walter Mabry 2021-10-14

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链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1563801-drawing-line-through-scatter-plot

编辑： Walter Mabry 2021-10-14

clear 
I = imread('star.png');
[r,c,nc] = size(I);
GC = I(:,:,2);
BI = GC < 200;
[y,x]=find(BI);
y=y*-1; x=x*-1;
c = linspace(1,10,length(x));
figure
plot(x,y,'.')

The code plots the folowing graph

I want to make on continuous line that produces the same image. So basically x an y cordinates for a line that traces this star.

EDIT: Also wanted to mention that I have tried implementing a polyfit--> polyval rountine but It has not given me the desired results.

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Matt J 2021-10-14

在 MATLAB Online 中打开

Your code doesn't run to completion:

I = imread('star.png');
[r,c,nc] = size(I);
GC = I(:,:,2);
Index in position 3 exceeds array bounds. Index must not exceed 1.
BI = GC < 200;
[y,x]=find(BI);
y=y*-1; x=x*-1;
c = linspace(1,10,length(x));
figure
plot(x,y,'.')