how can i draw contourf plot

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윤혁
윤혁 2024-9-14
评论： Angelo Yeo 2024-9-14
I'm going to make a plot like this picture.
I interpolated the data using the interp1 function. However, contourf can only contain values of 2*2 or more, so the function cannot be executed. How do I solve this?
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Angelo Yeo
Angelo Yeo 2024-9-14
Can you share your data and script that you have tried with so far?

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回答（1 个）

Ayush
Ayush 2024-9-14
Ran in:
Hi 윤혁
If your data is too sparse, consider increasing the number of points used in interpolation. You can do this by defining a finer grid for interpolation. Here is the sample code for this technique:
% Sample data
x = 1:10;
y = sin(x);
% Define a finer grid for interpolation
xq = 1:0.1:10;
% Interpolate the data
yq = interp1(x, y, xq, 'spline');
% Create a meshgrid for contour plot
[X, Y] = meshgrid(xq, xq);
Z = sin(X) .* cos(Y); % Example function for Z values
% Ensure Z has dimensions 2x2 or more
if min(size(Z)) < 2
error('Z must be at least 2x2 in size');
end
% Create contour plot
contourf(X, Y, Z);
colorbar;
title('Interpolated Contour Plot');
xlabel('X-axis');
ylabel('Y-axis');
I hope this was helpful.

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