Simple 2D contour plots

MS
2020 5 5
1 个回答
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更新时间：2020 5 5
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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))');%error line
contourf(R, C, F)% error line
end
Please help me to plot and save high quality contour plots for a sequence of files. I am attaching the code and the data files for your reference.

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KALYAN ACHARJYA
KALYAN ACHARJYA 2020-5-5

1 个投票

Create the meshgrid of R,C,F then plot contour
https://www.mathworks.com/help/matlab/ref/contour.html

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MS
MS 2020-5-5
编辑：MS 2020-5-5
Thanks. I have done it already. I got an error.
Error using contourf (line 57)
Z must be at least a 2x2 matrix.
would you mind to add a line?
KALYAN ACHARJYA
KALYAN ACHARJYA 2020-5-5
编辑：KALYAN ACHARJYA 2020-5-5
All must be 2D grid R,C,F
MS
MS 2020-5-5
actaully, i do not know it after reading it. Also, i wanted to save the high quality picture automatically. I request to add suitable code if possible.
KALYAN ACHARJYA
KALYAN ACHARJYA 2020-5-5
Is the contour in necessity? Plot3
MS
MS 2020-5-5
编辑：MS 2020-5-5
There is a way to plot the contour wthout the meshgrid. I want to plot the high quality contour and save it automatically. Can you help me to add simple correct code to serve my purpose?
KALYAN ACHARJYA
KALYAN ACHARJYA 2020-5-5
编辑：KALYAN ACHARJYA 2020-5-5
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
plot3(R,C,repmat(F,1,numel(C))');
grid on;
saveas(gcf,[num2str(i),'.png']);
end
%Example of Saved image
MS
MS 2020-5-5
编辑：MS 2020-5-5
Thanks you very much for the help. I need to plot 2D contour plots. Can you take a look at it . Also, i want to save as individual 11 plots. I neea a contour plots as shown in the figure below.
Ameer Hamza
Ameer Hamza 2020-5-5
@MS, the image you posted is a quiver plot, not a contour plot? Which one do you want? Note that for the quiver plot, you will need 4 input variables instead of 3 needed for contour.

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