Change format of field contour labels that have been manually added in a tiled layout

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Daniel
Daniel 2024-9-10
移动：Voss 2024-9-10
Hi,
Trying to manually add contour labels over a filled contour plot over a narrow range of values.
Matlab returns the error:
Error using hgconvertunits
The reference object is invalid.
Any ideas how I can manually add labels to a tiledlayout?
I also assume there is no workaround for avoiding the contours from striking through the labels when added manually?
Thank you
a = 0.98;
b = 1.02;
Z = round(((b-a).*rand(99,99) + a),2);
XY = [-0.375:.125:.375];
no_levels = 8;
npoints = [99 99]; % define improved resolution
Xfine = linspace(XY(1),XY(end),npoints(1)); % y coords
Yfine = linspace(XY(1),XY(end),npoints(2)); % z coords
[Xfine Yfine] = meshgrid(Xfine,Yfine); % create mesh
tiledlayout(1,2)
for i = 1:2
nexttile(1)
[C,H] = contourf(Xfine,Yfine,Z,no_levels,'-');
% clabel(C,H,'interpreter','latex','FontSize',14);
% H.LevelList = round(H.LevelList,1); % rounds levels to 1st decimal place
clabel(C,H,"manual",'FontSize', 22)
hold on
ylim([-0.5 0.5]);
y = ylim;
yticks([y(1):.25:y(2)])
xticks([-.5:.25:.5])
xlim([-.55 .55])
axis square
end

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采纳的回答

Mathieu NOE
Mathieu NOE 2024-9-10
Ran in:
why not create explicitely the levels (V array) ?
a = 0.98;
b = 1.02;
Z = peaks(99)/100 + (a+b)/2 ;
XY = [-0.375:.125:.375];
no_levels = 8;
V = round(linspace(min(Z,[],'all'),max(Z,[],'all'),no_levels),2); % create levels explicitely
npoints = [99 99]; % define improved resolution
Xfine = linspace(XY(1),XY(end),npoints(1)); % y coords
Yfine = linspace(XY(1),XY(end),npoints(2)); % z coords
[Xfine, Yfine] = meshgrid(Xfine,Yfine); % create mesh
tiledlayout(1,2)
for i = 1:2
nexttile(1)
[C,H] = contourf(Xfine,Yfine,Z,V);
clabel(C,H,'interpreter','latex','FontSize',10);
hold on
ylim([-0.5 0.5]);
y = ylim;
yticks([y(1):.25:y(2)])
xticks([-.5:.25:.5])
xlim([-.55 .55])
axis square
end

更多回答（1 个）

praguna manvi
praguna manvi 2024-9-10
编辑：praguna manvi 2024-9-10
Hi @Daniel,
I also observed the same error at “clabel(C, H, “manual”)” inside tiledLayout. I find that you could use subplot for manual labelling as follows to achieve the same effect for a 1 x 2 layout:
a = 0.98;
b = 1.02;
Z = round(((b-a).*rand(99,99) + a),2);
XY = [-0.375:.125:.375];
no_levels = 8;
npoints = [99 99];
Xfine = linspace(XY(1),XY(end),npoints(1));
Yfine = linspace(XY(1),XY(end),npoints(2));
[Xfine, Yfine] = meshgrid(Xfine,Yfine);
figure;
for i = 1:2
subplot(1, 2, i);
[C,H] = contourf(Xfine,Yfine,Z,no_levels,'-');
clabel(C,H,"manual",'FontSize', 22, "Color", [1, 1, 1]);
hold on;
ylim([-0.5 0.5]);
y = ylim;
yticks([y(1):.25:y(2)]);
xticks([-.5:.25:.5]);
xlim([-.55 .55]);
axis square;
end
Hope this helps!
  1 个评论
Daniel
Daniel 2024-9-10
Thank you for your help, Praguna. So many of my plots are in tiled layouts, I actually don't think that it's worth the effort to change everything for a few labels. I'm never content with how they look anyway, manually placed or otherwise. I'll just stick with the colour axis to guide the reader.

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