How to customize a color bar in matlab plot?

I want to create a color bar similar to this one (see the attachment). The zero value is white and has different jet patterns on both side (positive and negative). Thanks

Answer 1

[DGM]

For what it's worth, here's the same colormap reconstructed. The map is PWL in RGB, so it's easy enough.

% generate a new CT from a list of breakpoints
N = 256; % new CT length
x = [0 48 84 128 168 199 256]/256;
CT0 = [1 0 1; 0 0 0.85; 0 1 1; 1 1 1; 0 1 0; 1 1 0; 1 0 0];

xf = linspace(0,1,N);
CT = interp1(x,CT0,xf,'linear','extrap');

% plot the channel trajectories (it's PWL)
plot(CT(:,1),'r'); hold on
plot(CT(:,2),'g')
plot(CT(:,3),'b')

% use the map to plot something
x = linspace(-pi/2,pi/2,30);
y = x.';
z = sin(x).*sin(y);

surf(x,y,z)
colormap(CT)
colorbar
view(-17,50)

Though there are many other bidirectional colormaps out there that would be better.

Answer 2

[KSSV]

c1 = jet ;
c2 = [1 1 1] ;
c3 = hsv ;

c = [c1 ; c2; c3] ;

[X,Y,Z] = peaks(100) ;

surf(X,Y,Z)
colorbar
colormap(c)

Answer 3

[I R]

Thanks for prompt reply. I tried your method but the transition from white to other colors is not smooth enough. Anyway, i have found an answer to my question here (https://www.mathworks.com/matlabcentral/fileexchange/36212-b2r-cmin-input-cmax-input-) Thanks again :)