Creating three shaded regions in a loglog plot

Question

Yoshi 2024-3-28

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2100306-creating-three-shaded-regions-in-a-loglog-plot

评论： Star Strider 2024-4-1

I'm trying to create three regions with different colors on a loglog plot. I've tried implementing the patch function but every iteration that I've tried to imlement just screws the entire figure. I've verified that there are no negative values so not sure what is going on. Any help would be much appreciated!

R = 8.31;

N = 6.022e23;

Dia_air = 3.5e-10;

P = 101325;

Kn_1 = 0.1;

Kn_2 = 10;

Dia_al = [1e-2,1e-1,1e0,1e1,1e2]*1e-6;

T_1= flip(Kn_1*(sqrt(2)*pi()*Dia_air^2*N*P.*Dia_al)/R);

T_2= flip(Kn_2*(sqrt(2)*pi()*Dia_air^2*N*P.*Dia_al)/R);

figure(1)

loglog(Dia_al/1e-6,T_1,'k--')

hold on

loglog(Dia_al/1e-6,T_2,'k')

xlim([1e-2 1e2])

ylim([1e1 1e5])

hold off

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

Star Strider 2024-3-28

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2100306-creating-three-shaded-regions-in-a-loglog-plot#answer_1433091

编辑：Star Strider 2024-3-28

在 MATLAB Online 中打开

Perhaps something like this —

R = 8.31;

N = 6.022e23;

Dia_air = 3.5e-10;

P = 101325;

Kn_1 = 0.1;

Kn_2 = 10;

Dia_al = [1e-2,1e-1,1e0,1e1,1e2]*1e-6;

T_1= flip(Kn_1*(sqrt(2)*pi()*Dia_air^2*N*P.*Dia_al)/R);

T_2= flip(Kn_2*(sqrt(2)*pi()*Dia_air^2*N*P.*Dia_al)/R);

figure(1)

loglog(Dia_al/1e-6,T_1,'k--')

hold on

loglog(Dia_al/1e-6,T_2,'k')

patch([Dia_al flip(Dia_al)]/1e-6, [ones(size(T_1))*min(T_1) flip(T_1)], 'r', 'EdgeColor','none')

patch([Dia_al flip(Dia_al)]/1e-6, [T_1 flip(T_2)], 'b', 'EdgeColor','none')

patch([Dia_al flip(Dia_al)]/1e-6, [T_2 ones(size(T_2))*max(ylim)], 'g', 'EdgeColor','none')

xlim([1e-2 1e2])

ylim([1e1 1e5])

hold off

The patch calls require a closed contour, and that can be provided by choosing the y-vectors apporopriately, since they all share the same x-vector.

EDIT — Added: 'EdgeColor','none' to each patch call.

Note that in earlier versions of MATLAB (I do not remember when that changed), patch does not work with logarithmic axis scales. In that event, use plot for the loglog calls, keep the patch calls as they are, and afterwards use:

set(gca, 'XScale','log', 'YScale','log')

.