How to plot the elements of a matrix with a specific coordinates and specified the region in matlab?

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Mavis Lee 2019-10-29

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https://ww2.mathworks.cn/matlabcentral/answers/487976-how-to-plot-the-elements-of-a-matrix-with-a-specific-coordinates-and-specified-the-region-in-matlab

评论： Mavis Lee 2019-10-29

Hello everybody. I need your help about a problem that I have in matlab.

For instance lets say that I have a Matrix X = [1,2,3,4,5,6,7,8] with different coordianates as shown above. For example, Element 1 of the matrix = (0,1).

And, I would like to set the regions as shown in below.

Is it possibles to create something like this?

Thank you in advance.

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darova 2019-10-29

And, I would like to set the regions as shown in below.

You want to paint regions in different color?

Mavis Lee 2019-10-29

编辑：Mavis Lee 2019-10-29

Hi Darova.

It's ok with or without the color.

I just want to set few regions inside the Circle. For example, the region 1 (yellow color) is located within 1, 5 and 2 as shown in figure below.

It is possible to set the region using the coordinates of point 1, 5 and 2 or have other better solution?

Thank you in advance.

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Answer 1

darova 2019-10-29

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https://ww2.mathworks.cn/matlabcentral/answers/487976-how-to-plot-the-elements-of-a-matrix-with-a-specific-coordinates-and-specified-the-region-in-matlab#answer_398716

在 MATLAB Online 中打开

Maybe inpolygon

n = 100;
t = -linspace(0,2*pi,n)+pi/2;
x = cos(t);
y = sin(t);
x0 = 0.5;                              % point to check
y0 = 0.7;
nd = 8;                                % divide circle in 8 parts
for i = 1:nd
    ii = (i-1)*n/nd+1 : i*n/nd;
    ii = round(ii);
    if inpolygon(x0,y0,[x 0],[y -11])    % segment of a circle and (0,-1) point
        sprintf('point in R%d region',i)
    end
end

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darova 2019-10-29

在 MATLAB Online 中打开

My bed, sorry

clc,clear
n = 100;
t = -linspace(0,2*pi,n)+pi/2;
x = cos(t);
y = sin(t);
x0 = 0.5;                              % point to check
y0 = 0.2;
nd = 8;                                % divide circle in 8 parts
cla
plot(x,y,'.b')
hold on
plot(x0,y0,'or')
i1 = 1;                                % start index of a section
for i = 1:nd
    i2 = round(i*n/nd);                % end index of a section
    xx = [x(i1:i2) 0];                 % region of interest
    yy = [y(i1:i2) -1];
    p = patch(xx,yy,'','FaceCOlor',rand(1,3));
    if inpolygon(x0,y0,xx,yy)          % segment of a circle and (0,-1) point
        sprintf('point is in R%d region',i)
        plot(x0,y0,'or')
    end
    pause(0.5)
%     delete(p)
    i1 = i2;
end
hold off