Want to make changes to the colorbar

Hi guys,

I have a simply surface below which gets printed with a colorbar. I want to make some minor adjustments to the colorbar. Since my graph is a very 'binary' graph (either 1 or 0), I want my colorbar to only show '0' and '1'. I don't want it to show all the decimal values between 1 and 0.

I then want the colorbar's 1 to show a certain text ("values are > 0.5") and the 0 to show ("vales are < 0.5")

Hope this makes sense. Thanks very much!

x = [-10:10];
y = [-10:10];

Eq1 = @(x,y)(x + y);
Eq2 = @(x,y)(2.*x + y);

[X,Y] = meshgrid(x,y);

Z1 = Eq1(X,Y);
Z2 = Eq2(X,Y);

D = (abs(Z2-Z1) > 0.5);
[Dr,Dc] = find(D);                  % Indices where D == 1

figure(1)
s1 = surf(X, Y, double(D));
colormap(winter(256)) 
view(0,90)

axis tight

colorbar

Answer 1

[Montree]

Use 'YTicklable' such as...

colorbars('YTicklabel',{'0','1'})

See more detail on matlab help.

[A]

Thanks - I'm almost there. I just need bit more help.

1) Can I change the 'color gradient' of the color bar so that it only shows the green and the blue? And nothing in the middle?

2) How can I make changes to the text style/position/placement of the 'more' and 'less'?

x = [-10:10];
y = [-10:10];
Eq1 = @(x,y)(x + y);
Eq2 = @(x,y)(2.*x + y);
[X,Y] = meshgrid(x,y);
Z1 = Eq1(X,Y);
Z2 = Eq2(X,Y);
D = (abs(Z2-Z1) > 0.5);
[Dr,Dc] = find(D);                  % Indices where D == 1
figure(1)
s1 = surf(X, Y, double(D));
colormap(winter(256)) 
view(0,90)
axis tight
colorbar('YTick',[0 1],'YTicklabel',{'Less','More'})

Answer 2

[Image Analyst]

Are you sure you want to Accept the other answer? Because it's not giving you the colormap I think you want. What I thought you wanted is this:

x = [-10:10];
y = [-10:10];

Eq1 = @(x,y)(x + y);
Eq2 = @(x,y)(2.*x + y);

[X,Y] = meshgrid(x,y);
Z1 = Eq1(X,Y);
Z2 = Eq2(X,Y);

D = (abs(Z2-Z1) > 0.5);
[Dr,Dc] = find(D);                  % Indices where D == 1

s1 = surf(X, Y, double(D));
view(0,90)
axis tight

blueAndGreenColormap = [repmat([0,0,1], [128,1]) ; repmat([0,1,0], [128,1])]
colormap(blueAndGreenColormap) 
colorbar

Is this really wanted instead?

[A]

Yes it is! Wow. Thank you so much. What I have now is perfect thanks to you guys:

x = [-10:10];
y = [-10:10];
Eq1 = @(x,y)(x + y);
Eq2 = @(x,y)(2.*x + y);
[X,Y] = meshgrid(x,y);
Z1 = Eq1(X,Y);
Z2 = Eq2(X,Y);
D = (abs(Z2-Z1) > 0.5);
[Dr,Dc] = find(D);                  % Indices where D == 1
s1 = surf(X, Y, double(D));
view(0,90)
axis tight
blueAndGreenColormap = [repmat([0,0,1], [128,1]) ; repmat([0,1,0], [128,1])]
colormap(blueAndGreenColormap) 
colorbar('YTick',[0 1],'YTicklabel',{'Less','More'})

Can I accept your answer? Also, how can I make changes to the "More" "Less" labels? I want to position them to be in the 'middle' of their respective colorbars. I also want to change their font style/type/etc?

[Image Analyst]

You're welcome. You can adjust the location, size, and font name like this:

colorbar('YTick',[0.3 .7],'YTicklabel',{'Less','More'},...
  'FontSize', 20, 'FontName', 'Courier')

Once you've Accepted one answer, you can't accept another (unless I delete the first one). But you can "Vote" for any number of answers you like to give the Answerer(s) "reputation points."

[A]

Thanks! I have voted you up.

[A]

Hi ImageAnalyst,

Quick question --> Is there a way to 'rotate' the 'Less' and 'More' text to be 90 degrees? So that the orientation of the text is vertical.

Thanks

[Image Analyst]

There is a rotation property:

Rotation — Text orientation
0 (default) | scalar value in degrees
Text orientation, specified as a scalar value in degrees. The default rotation of 0 degrees makes the text horizontal. For vertical text, set this property to 90 or -90. Positive values rotate the text counterclockwise. Negative values rotate the text clockwise.

Example: 90

Example: -90

[A]

Thanks - but when I do this, it produces an error:

colorbar('YTick',[0.05 .95],'YTicklabel',{'Less','More'},'FontSize', 7, 'FontName', 'Calibri', 'Rotation',90)

[Image Analyst]

Try this:

clc;    % Clear the command window.
close all;  % Close all figures (except those of imtool.)
clear;  % Erase all existing variables. Or clearvars if you want.
workspace;  % Make sure the workspace panel is showing.
format long g;
format compact;
fontSize = 20;

x = [-10:10];
y = [-10:10];

Eq1 = @(x,y)(x + y);
Eq2 = @(x,y)(2.*x + y);

[X,Y] = meshgrid(x,y);
Z1 = Eq1(X,Y);
Z2 = Eq2(X,Y);

D = (abs(Z2-Z1) > 0.5);
[Dr,Dc] = find(D);                  % Indices where D == 1

s1 = surf(X, Y, double(D));
view(0,90)
axis tight

blueAndGreenColormap = [repmat([0,0,1], [128,1]) ; repmat([0,1,0], [128,1])]
colormap(blueAndGreenColormap) 
hCB = colorbar('YTick',[0.05 .95], 'YTicklabel',[], 'FontSize', 17, 'FontName', 'Calibri')
text(13, -7, 'More                     Less', 'FontSize', 17, 'Rotation',90);

[Image Analyst]

"A"'s "Answer" moved here to be a comment since it's not an "Answer" to the original question.

That works. Thanks!