Using pcolor to create a a color scale.

Hi all,

I made some posts a few months back about making a colour wheel. I've been able to do that using the following code.

n = 300;                  % number of cells
m = 220;                    %cells to remove for annulus ; 
r = (m:n)'/n ;           % radius   n - m = width of the annulus
r_test = (m:n)' * 0;    % 0s the radius values
r_test = r_test + 5;    % adds 1 to the radius values, for uniform colors 
theta = pi*(-n:n)/n;    % change of colors throughout the circum of circle
X = r*cos(theta);
Y = r*sin(theta);

%C = r*cos(2*theta);      % defines the color
C_test = r_test * (theta);

i = pcolor(X,Y,C_test);
set(i,'LineStyle','none');
colormap(finalrgb_scaled);
shading interp;            
axis off;

Now I need to generate a vertical colour scale. It would have the same colour map as the code above, but the colours would need to be fit into a vertical bar/rectangle. I'm pretty new to matlab so I'm not sure how to change the X, Y, and C inputs for pcolor to generate a vertical rectangle. Any ideas on how to do this? I would greatly appreciate. Thanks!

Just for an idea of what I'm trying to make here, you can check out this image (the color scale on the far right).

http://www.google.ca/imgres?q=vertical+colour+scale&um=1&hl=en&biw=1920&bih=993&tbm=isch&tbnid=8YhjfN3JVdMb7M:&imgrefurl=http://www1.gly.bris.ac.uk/~wookey/MMA/index.htm&docid=XzX33p3qHooqiM&imgurl=http://www1.gly.bris.ac.uk/~wookey/MMA/upwell_model.jpg&w=914&h=601&ei=DJ3sT_TSI8rr0gGii6TqBQ&zoom=1&iact=hc&vpx=1485&vpy=508&dur=1119&hovh=153&hovw=232&tx=203&ty=78&sig=114023324397474345318&page=1&tbnh=144&tbnw=219&start=0&ndsp=50&ved=1t:429,r:28,s:0,i:157

[Tom]

Is there any reason why you're not just using colorbar?

Answer 1

[Sean de Wolski]

Looks like a colorbar to me!