More curves in one graph

Hi, Could someone give me advice with plot more curves in different colors, I would like to see superposing those curves.. Concretely plot RHO_start for 3 curves in one window. Here is my code:

clear,clc,close all

abc='abc'; cal=18/230;

Results=[]; bold

    data=[];
    for i=1:3
        im=imread(['vz_' num2str(j) abc(i) '.jpg']);
        im=imresize(im,0.5);
        %figure,imshow(im)

        I=rgb2gray(im);
        %figure,imshow(I);
        J=imadjust(I);
        %figure,imshow(J);
        T=graythresh (J);
        BW=im2bw(J,T);
        %figure,imshow(BW);
        BWI=1-BW;
        %figure,imshow(BWI);
        B=imclearborder(BWI);
        O=bwareaopen(B,40000);
        H=imfill(O,'holes');
        L=bwlabel(H);
        S=regionprops(L,'Area','Perimeter');
        SE=[0 1 0;1 1 1;0 1 0];
        %figure,imshow(H);
        D=imdilate(H,SE);
        E=edge(D,'canny');
        %imshow(E);

        bound=bwboundaries(E);
        %figure,imshow(E);hold on;
        for k=1
            b=bound{k};
            %plot(b(:,2),b(:,1),'r','LineWidth',1.5);
        end
        for x=1:numel(S)
            %plot(S(x).Centroid(1),S(x).Centroid(2),'ro');
        end

        xx=b(:,2);
        yy=b(:,1);
        %figure,plot(xx,yy);axis equal;

        XX=xx-mean(xx);
        YY=yy-mean(yy);

        THETA=XX;
        RHO=YY;
        %figure,plot(XX,YY);axis equal;
        [THETA,RHO]=cart2pol(XX,YY);
        %figure,polar(THETA,RHO);
        %figure,plot(THETA);
        %figure,plot(RHO);

        RHO_smooth=smooth(RHO,30);
        [Mc,Xc]=min(RHO_smooth);
        *RHO_start* =[RHO_smooth(Xc:size(RHO_smooth));RHO_smooth(1:Xc)];
        tc=1:length(RHO_start);
        [~,locsc]=findpeaks(RHO_start,'MinPeakHeight',160,'MinPeakDistance',50);
        figure;hold on;
        plot(tc,RHO_start);
        plot(locsc,RHO_start(locsc),'rv','MarkerFaceColor','r');
        grid on;
        title('Number of peaks');
        xlabel('angle');
        ylabel('radius');
        data=[data; i (S.Area)*cal^2 (S.Perimeter)*cal];
    end
    data
    As=mean(data(:,2));
    Results=[Results; j As];
end

Thanks

Answer 1

[Image Analyst]

You can use a 'Color' option in plot. Follow that by 3 numbers in a 1 by 3 array in the range of 0-1, like

plot(x, y, 'Color', [.2, .3, .8], 'LineWidth', 2);