how can i draw contourf plot

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?

[Angelo Yeo]

Can you share your data and script that you have tried with so far?

Answer 1

[Ayush]

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.