Color map jet from center

Hi,

I am trying to make the colour map 'jet' apper red in the center and go outwards.

I have tried using flipud but it simply inverts it, making the red go at the bottom, so not what I am looking for.

Also,

I am trying to get my lines in the statement

line(x ,y,z,  'LineStyle', '-'); 

appear in the colormap jet as well. I have tried muiltple times but gives me an error.

Full code :

 x = DistanceX .* cos(AngleX);
 y = DistanceY .* sin(AngleY);'
 z = DistanceZ .* cos(AngleZ) ;

 
load flujet
figure;  

grid on;
scatter3 (x,y,z, [] , z); 
line(x ,y,z,  'LineStyle', '-' );
colormap (flipud(jet))
 

[Image Analyst]

No, that's not the full code. Not only does it throw a syntax error, but there is no assignment oa DistanceX, AngleX, etc. Please post your full code, and include the flujet.mat file (if it's not a built-in one that's shipped with MATLAB).

Answer 1

[Ameer Hamza]

Something like this?

cm = jet;
cm = circshift(cm, round(size(cm, 1)/2), 1);

image(reshape(cm, 256, 1, []));

Answer 2

[Image Analyst]

Is this what you mean?

% Create colormap with jet where red is at the center and blue is at the ends.
cmap = [jet; flipud(jet)];
% Create a simple image that is a ramp of gray scales.
ramp = uint8(repmat((0:255)', [1, 512]));

% This is what it looks like in gray scale.
subplot(2, 1, 1);
imshow(ramp, 'ColorMap', gray(256))
colorbar
title('This is what it looks like in gray scale.');

% This is what it looks like in pseudocolor.
subplot(2, 1, 2);
imshow(ramp, 'ColorMap', cmap)
colorbar
title('This is what it looks like in pseudocolor.');