Color map from green to red

Prashant Kumar answered . 2025-01-30 12:36:05

% Create green-to-red colormap
cMap = interp1([0;1],[0 1 0; 1 0 0],linspace(0,1,256));

% Apply to the plot
surf(peaks)
colormap(cMap)
colorbar

Creating a colormap that transitions from green to red in MATLAB is a great way to visualize your data. Here's how you can do it:

1. Generate Your Data:
   Assume you have a matrix `data` that contains your values.

   data = rand(10, 10);  % Replace this with your actual data
 

2. Create the Colormap**:
   Define a colormap that transitions from green to red.

   
   colormap = [linspace(0, 1, 256)', linspace(1, 0, 256)', zeros(256, 1)];
  

3. Display the Data:
   Use the `imagesc` function to display the data and apply the colormap.

   imagesc(data);
   colormap(colormap);
   colorbar;
 

4. Adjust Color Limits:
   Optionally, you can adjust the color limits to ensure that the value closest to 0 is green and the farthest value is red.

 
   caxis([min(data(:)), max(data(:))]);
   

Here’s the complete code:

data = rand(10, 10);  % Replace this with your actual data
colormap = [linspace(0, 1, 256)', linspace(1, 0, 256)', zeros(256, 1)];
imagesc(data);
colormap(colormap);
colorbar;
caxis([min(data(:)), max(data(:))]);

This will create a heatmap with colors ranging from green (for values closest to 0) to red (for the highest values).

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