Example 1

One 、 View

Two 、 Code

 author ：CoderMan
 link ：https://www.zhihu.com/question/503639152/answer/2257427351
 source ： You know 
 The copyright belongs to the author . Commercial reprint please contact the author for authorization , Non-commercial reprint please indicate the source .

clear;clc;
[x, y, z] = peaks(30);
min_z = min(z(:));
max_z = max(z(:));
%  Mapping to  0 - 1
z = (z - min_z) ./ (max_z - min_z);
%  Mapping to  0 - 1000
z = z * 1000;
%  Color   Simplicity   Array set to data range size 
c_map = zeros(1000, 3);
%  green 
c_map(1:160, :) = repmat([0, 1, 0], 160, 1);
%  Blue 
c_map(161:260, :) = repmat([0, 1, 1], 100, 1);
%  yellow 
c_map(261:530, :) = repmat([1, 1, 0], 270, 1);
%  Red 
c_map(530:end, :) = repmat([1, 0, 0], 471, 1);
subplot(1, 2, 1)
surf(x, y, z);
colormap(c_map)
colorbar
shading interp
subplot(1, 2, 2)
contourf(x, y, z);
colormap(c_map)
colorbar

Example 2 、MATLAB Draw a two-dimensional line gradient Color

x = -5:0.1:5;
y = x.^2;
z = x.^2;
patch([x,nan],[y,nan],[z,nan],'EdgeColor','flat','LineWidth',1,'MarkerFaceColor','flat','FaceColor','none')
colorbar

The effect is as follows ：

% Load and save as mat Matrix of variables
load circRNA_ss cirRNA_ss
% Execute the following statements respectively
imagesc(circRNA_ss);
colormap jet
colorbar

color The domain value of is 0—1 
plot(x,y,'Color',[1 0 0]); For red
plot(x,y,'Color',[0 1 0]); Representing green
plot(x,y,'Color',[0 0 1]); Representing blue  
plot(x,y,'Color',[0.3 0.8 0.9]); Is a new color composed of three colors .

Display the color bar of the color scale - MATLAB colorbar - MathWorks China