Want to make changes to the colorbar

A
A
2015 1 2
2 个回答
回答已采纳
更新时间：2015 1 5
12 次查看（30 天）

0 个投票

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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 采纳的回答

Montree
Montree 2015-1-2

0 个投票

Use 'YTicklable' such as...
colorbars('YTicklabel',{'0','1'})
See more detail on matlab help.

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A
A 2015-1-2
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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更多回答（1 个）

Image Analyst
Image Analyst 2015-1-3

3 个投票

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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A
A 2015-1-3
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
Image Analyst 2015-1-3
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
A 2015-1-4
Thanks! I have voted you up.
A
A 2015-1-4
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
Image Analyst 2015-1-4
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
A 2015-1-4
编辑：A 2015-1-4
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
Image Analyst 2015-1-4
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
Image Analyst 2015-1-5
"A"'s "Answer" moved here to be a comment since it's not an "Answer" to the original question.
That works. Thanks!

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