plot 2D contours
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I need help to plot 2D contours as shown in the figure for mutiple files. I am attaching my code and data files for your reference. I am unable to plot it due to some mistake in the code.
navg = 11;
filenames = cell(navg,1);
for i = 1:navg
filenames = sprintf('queen2_test_%d.dat', i);
mydata{i}=importdata(filenames);
% writematrix(avg_mat{i}, filenames{i});
R = mydata{i}(:,1);%X
C = mydata{i}(:,2);%Y
F = mydata{i}(:,7);%F(X,Y)
figure
contour(R,C,repmat(F,1,numel(C))');
grid on;
end
saveas(gcf,figure,'.png']);
采纳的回答
Ameer Hamza
2020-5-5
编辑：Ameer Hamza
2020-5-5
Run the attached code with the files you provided
navg = 11;
filenames = cell(navg,1);
for i = 1:navg
filenames = sprintf('queen2_test_%d.dat', i);
mydata{i}=importdata(filenames);
% writematrix(avg_mat{i}, filenames{i});
R = mydata{i}(:,1);%X
C = mydata{i}(:,2);%Y
F = mydata{i}(:,7);%F(X,Y)
rg = linspace(min(R), max(R), 100);
cg = linspace(min(C), max(C), 100);
[Rg, Cg] = meshgrid(rg, cg);
Fg = griddata(R, C, F, Rg, Cg);
figure
ax = axes();
ax.YDir = 'reverse';
hold on;
contourf(Rg,Cg,Fg);
ax.XAxisLocation = 'top';
cb = colorbar('Location', 'south');
cb.Position(2) = cb.Position(2)-0.11;
grid on;
saveas(gcf,filenames(1:end-4),'png');
delete(gcf);
end
19 个评论
Ameer Hamza
2020-5-5
编辑：Ameer Hamza
2020-5-5
Note if you are using R2020a, then you can replace the saveas() line to the following line to get a better quality output
exportgraphics(gcf,[filenames(1:end-4),'.png'], 'Resolution', 300);
If you don't have R2020a, then download this package from FEX: https://www.mathworks.com/matlabcentral/fileexchange/23629-export_fig and use the following line to save high-resolution output
export_fig(gcf,[filenames(1:end-4),'.png'], '-r300');
Ameer Hamza
2020-5-5
Run the updated code.
MS
2020-5-5
Thanks, I want contour also fliped as shwon in the figure. in the updated code, the contour is not flipped.
Ameer Hamza
2020-5-5
check the updated code.
MS
2020-5-5
Awesome. I am really grateful to you. The axes is interferrring with the contour as shown in the figure(going inside the contour plot). is it a a bug?
Ameer Hamza
2020-5-5
This problem is not happening in R2020a. As a quick-fix, you can move the axes a bit up
ax = axes();
ax.YDir = 'reverse';
ax.Position(2) = ax.Position(2)+0.02; % <=== add this line. Tune value of 0.02 until there is no overlap
MS
2020-5-5
Ameer Hamza
2020-5-7
What does that represent? I am not sure why that could be useful. Also, It is impossible in MATLAB. The second limit should be greater than first.
Ameer Hamza
2020-5-7
Oh! I misread it to be caxis(obj.hAxes, [150 150]). Your syntax seems correct. It should show colorbar between -150 to 150.
MS
2020-5-7
Ameer Hamza
2020-5-7
Are you making a GUI using GUIDE? Where did you get the statement 'obj.hAxes'
MS
2020-5-7
Ameer Hamza
2020-5-7
Yes, if you have single axes then you don't need to specify an axes handle.
MS
2020-5-7
hi ameer,
I want to label the colur bar as shown in the figure1.
my current code is labelling beside as shown in the figure below instead of labelling on the top as shown in the above figure1 .
h = colorbar;
xlabel(h, 'ω')
Kindly suggest a code.
MS
2020-5-8
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