REDBLUE(M)是一个M x 3的矩阵，它定义了一种颜色映射关系。
REDBLUE(M), is an M-by-3 matrix that defines a colormap.
颜色变化从亮蓝色开始，范围从蓝色到白色，然后从红色到亮红色。
The colors begin with bright blue, range through shades of blue to white, and then through shades of red to bright red.
function c = redblue(m)
%REDBLUE Shades of red and blue color map
% REDBLUE(M), is an M-by-3 matrix that defines a colormap.
% The colors begin with bright blue, range through shades of
% blue to white, and then through shades of red to bright red.
% REDBLUE, by itself, is the same length as the current figure’s
% colormap. If no figure exists, MATLAB creates one.
%
% For example, to reset the colormap of the current figure:
%
% colormap(redblue)
%
% See also HSV, GRAY, HOT, BONE, COPPER, PINK, FLAG,
% COLORMAP, RGBPLOT.
% Adam Auton, 9th October 2009
if nargin < 1, m = size(get(gcf,‘colormap’),1); end
if (mod(m,2) == 0)
% From [0 0 1] to [1 1 1], then [1 1 1] to [1 0 0];
m1 = m*0.5;
r = (0:m1-1)'/max(m1-1,1);
g = r;
r = [r; ones(m1,1)];
g = [g; flipud(g)];
b = flipud(r);
else
% From [0 0 1] to [1 1 1] to [1 0 0];
m1 = floor(m*0.5);
r = (0:m1-1)'/max(m1,1);
g = r;
r = [r; ones(m1+1,1)];
g = [g; 1; flipud(g)];
b = flipud(r);
end
c = [r g b];
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