Color map from green to red
I have a map with values and i would like to display the values with colors - from green to red. The value closest to 0 will be green and the farthest will be red. Example: 1, 5, 11, 33, 56, 100 1 - Green. 100 - Red. Can be also: -5, -23, -43, -55, -80. -5 - Green. -80 - Red. The rest values will be in the order and color bar.
Prashant Kumar answered .
2025-11-20
% 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).