Want to make changes to the colorbar

Question

A 2015-1-2

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/168756-want-to-make-changes-to-the-colorbar

评论： Image Analyst 2015-1-5

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

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Answer 1

Montree 2015-1-2

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/168756-want-to-make-changes-to-the-colorbar#answer_163867

在 MATLAB Online 中打开

Use 'YTicklable' such as...

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

See more detail on matlab help.

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A 2015-1-2

在 MATLAB Online 中打开

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'})

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Answer 2

Image Analyst 2015-1-3

3
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/168756-want-to-make-changes-to-the-colorbar#answer_163878

在 MATLAB Online 中打开

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?

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Image Analyst 2015-1-4

在 MATLAB Online 中打开

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);