Resultados de

0 - 1 de 1

Emma Farnan
Última actividad el 19 de Jul. de 2024

Set colormap limits when creating m colors

Several of the colormaps are great for a 256 color surface plot, but aren't well optimized for extracting m colors for plotting several independent lines. The issue is that many colormaps have start/end colors that are too similar or are suboptimal colors for lines. There are certainly many workarounds for this, but it would be a great quality of life to adjust that directly when calling this.

Example:

x = linspace(0,2*pi,101)'; 
y = [1:6].*cos(x); 
figure; plot(x,y,'LineWidth',2); grid on; axis tight;

And now if I wanted to color these lines, I could use something like turbo(6) or gray(6) and then apply it using colororder.

colororder(turbo(6))

But my issue is that the ends of the colormap are too similar. For other colormaps, you may get lines that are too light to be visible against the white background. There are plenty of workarounds, with my preference being to create extra colors and truncate that before using colororder.

cmap = turbo(8); cmap = cmap(2:end-1,:); % Truncate the end colors
figure; plot(x,y,'LineWidth',2); grid on; axis tight;
colororder(cmap)

I think it would be really awesome to add some name-argument input pair to these colormaps that can specify the range you want so this could even be done inside the colororder calling if desired. An example of my proposed solution would look something like this:

cmap = turbo(6,'Range',[0.1 0.8]); % Proposed idea to add functionality

Where in this scenario, the resulting colormap would be 6 equally spaced colors that range from 10% to 80% of the total color range. This would be especially nice because you could more quickly modify the range of colors, or you could set the limits regardless of whether you need to plot 3, 6, or 20 lines.

Ver publicación completa

0 - 1 de 1