Question

我试图在matlab中使用颜色条生成散点图，其中最小值的颜色为蓝色，最大值为红色。我可以使用文件交换中的redblue colomap（例如http://www.mathworks.com/matlabcentral/fileexchange/25536-red-blue-colormap）

来完成此操作

以下是一个例子：

dd = [70.7  140.0   902.0
70.2    138.6   765.0
68.4    141.2   645.0
67.8    133.2   735.0
64.9    137.7   398.0
63.8    145.1   583.0
74.6    126.6   1880.0
82.8    124.3   -71.0
91.8    124.7   1315.0
93.1    119.6   400.0
95.7    117.0   326.0
104.3   121.3   179.0
104.4   122.0   205.0
104.4   122.3   181.0
104.6   113.0   265.0
109.8   118.2   170.0
55.0    149.6   913.0];

scatter(dd(:,1),dd(:,2),80,dd(:,3),'filled');
box on;
colormap(redblue);
c = colorbar;

我想改变颜色条，使白色区域指零。这可以通过将caxis改为：

来完成

caxis([-1800 1800]);

但是在这个例子中这没有意义，因为大多数点都在0以上。因此，我希望找到一种方法，使颜色条从-200到1800，但颜色条中有白色仍然是零。这可能吗？

Answer 1

这是更新后的代码

dd = [70.7  140.0   902.0
70.2    138.6   765.0
68.4    141.2   645.0
67.8    133.2   735.0
64.9    137.7   398.0
63.8    145.1   583.0
74.6    126.6   1880.0
82.8    124.3   -71.0
91.8    124.7   1315.0
93.1    119.6   400.0
95.7    117.0   326.0
104.3   121.3   179.0
104.4   122.0   205.0
104.4   122.3   181.0
104.6   113.0   265.0
109.8   118.2   170.0
55.0    149.6   913.0];

scatter(dd(:,1),dd(:,2),80,dd(:,3),'filled');
box on;

%% color map begin
m = size(get(gcf,'colormap'),1);

    m2 = floor(m*0.9);
    r2 = ones(m2,1);
    b2 = flipud((0:m2-1)'/max(m2-1,1));
    g2 = b2;

    m1 = m-m2;
    r1 = (0:m2-1)'/max(m2-1,1);
    r1(1:(m2-m1))=[];
    g1 = r1;
    b1 = ones(m1,1);

    r = [r1; r2];
    g = [g1; g2];
    b = [b1; b2];
    cm = [r g b]; 

%% color map end

colormap(cm);
c = colorbar;
caxis([-200 1800]);

如果您不希望colormap对称。然后使用此

dd = [70.7  140.0   902.0
70.2    138.6   765.0
68.4    141.2   645.0
67.8    133.2   735.0
64.9    137.7   398.0
63.8    145.1   583.0
74.6    126.6   1880.0
82.8    124.3   -71.0
91.8    124.7   1315.0
93.1    119.6   400.0
95.7    117.0   326.0
104.3   121.3   179.0
104.4   122.0   205.0
104.4   122.3   181.0
104.6   113.0   265.0
109.8   118.2   170.0
55.0    149.6   913.0];

scatter(dd(:,1),dd(:,2),80,dd(:,3),'filled');
box on;

%% color map begin
m = size(get(gcf,'colormap'),1);

    m2 = floor(m*0.9);
    r2 = ones(m2,1);
    b2 = flipud((0:m2-1)'/max(m2-1,1));
    g2 = b2;

    m1 = m-m2;
    r1 = (0:m1-1)'/max(m1-1,1);
    g1 = r1;
    b1 = ones(m1,1);

    r = [r1; r2];
    g = [g1; g2];
    b = [b1; b2];
    cm = [r g b]; 

%% color map end

colormap(cm);
c = colorbar;
caxis([-200 1800]);

过渡期为零的redblue色彩图

1 个答案: