how do i plot a coordinate field with values for each specified coordinate?

2019 10 17
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更新时间：2025 8 4
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the coordinate field:
y = 1:0.5:31;
x = -13:1:13;
[X,Y] = meshgrid (z,y);
But from here i have no clue which command to use to give each coordinate a value and plot with colormap afterwards.
I already have a .txt file with every value organized. So data (1,1) should become mesh (-13,1) and data (1,2) should be mesh (-12,1)
thanks in advance!

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回答（1 个）

Soumya
Soumya 2025-8-4

0 个投票

Hi @jop schilder,
I understand that you have a coordinate field defined by some given ‘x’ and ‘y’ values, where each point on this grid should correspond to a value from a ‘.txt’ file. To solve this, you should load your ‘.txt’ file as a matrix, matching the grid size, then use MATLAB’s plotting functions such as ‘imagesc’ for a 2D heatmap, ‘surf’ for a 3D surface, or ‘contourf’ for filled contour plots visualization to map and display the values with a colormap.
Kindly refer to the given steps to achieve the same:
  • Create the mesh grid and load your data from the “.txt” file:
[X, Y] = meshgrid(x, y);
data = load('file.txt');
  • You can visualize the data as a 2D heatmap using a colormap, where each matrix value is automatically mapped to its corresponding (x, y) coordinate:
imagesc(X,Y, data);
axis xy;
colormap jet;
colorbar;
  • You can also visualize the data as a 3D surface plot, which helps illustrate value variations across three dimensions with smooth color interpolation:
surf(X, Y, data)
shading interp
colormap jet
colorbar
xlabel('X'); ylabel('Y'); zlabel('Value')
The above code generates the following output:
Please refer to the following documentations to get more information on the related functions: 
I hope this helps!

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Soumya
Soumya
2025-8-4

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