Drew a circle for a specific point in my plot
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Hi,
My objective is how to draw a circle for the min(PRESS). I wrote the following code for an ellipse, but I had to adjust the Xcenter and Ycenter handly, but I would rather do this in a automatically form, because if i change the min(PRESS) for example for the first two entries, the values changes and the elipse dont circle the point i want.
load('PRESS')
[mincumpress,nPC_imp] = min(PRESS(2:end,:))
x_aux = [0:maxpcs]';
figure
plot(x_aux,PRESS,'-b','LineWidth',2);
hold on
plot(x_aux,PRESS,'.r','MarkerSize',15);
yl = ylim; ylim([yl(1) yl(2)]);
xcenter = nPC_imp / xl(2) + 0.035
ycenter = mincumpress * (yl(2) - yl(1)) - 0.08
dim = [xcenter ycenter .05 .05];
annotation('ellipse',dim,'Color','red')
hold on
xlabel('PC Number'); ylabel('PRESS');title('PCA-CV (ckf)');
Thanks for your time
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回答(1 个)
KSSV
2018-7-10
Let C be the point, where you want to draw a circle.
N = 10 ;
x = 1:N ;
y = rand(N,1) ;
[val,idx] = max(y) ;
C = [x(idx) y(idx)] ;
plot(x,y) ;
hold on
R = 0.1 ; % Radius of circle
th = linspace(0,2*pi) ;
xc = C(1)+R*cos(th) ;
yc = C(2)+R*sin(th) ;
plot(xc,yc,'r') ;
axis equal
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