我使用Plot vector (or arc) onto a rose plot. MATLAB上的答案绘制了我的玫瑰图，但我的图如下所示：

我的代码是：

circ_plot(BB,'hist',[],20,true,true,'linewidth',2,'color','r')

hold on
plot([0 cos(mean)*a], [0 sin(mean)*a], 'r')  
%// Plot error as many shaded triangles that compose a circular wedge
t = linspace(-Var/2+mean,Var/2+mean,100); %// increase "100" if needed

for k = 1:numel(t)-1
    h = patch([0 cos(t(k))*a cos(t(k+1))*a 0], ...
    [0 sin(t(k))*a sin(t(k+1))*a 0], [.5 0 0], 'edgecolor', 'none');
    %// change color [.5 0 0] to something else if desired. Note also alpha

   set(h,'Facealpha',.3) %// make transparent
end  
%// Place rose on top by rearranging order of axis children
ch = get(gca,'children');
set(gca,'children',[ch(2:end); ch(1)]);

有没有办法让我的误差阴影区域沿着圆的周长，而不是三角形？
谢谢