Repeating values on colorbar

Question

Sunil S Hosakoti 2019-12-16

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/496860-repeating-values-on-colorbar

评论： Sunil S Hosakoti 2020-2-6

I have set a colobar for an experiment with a user defined limit for it, but i dont know why the colorbar is repeating the values cyclically. This is the part of the code that generates colorbar.

limColorBar = 2.0; 
colormap(ha,'hot');
caxis([0,limColorBar])
hcolorBar = colorbar(ha); hcolorBar.LimitsMode = 'manual';
hcolorBar.Limits = [0,limColorBar];
ha.CLim = [0,limColorBar];
hcolorBar.TickLabels = round((1/17)*hcolorBar.Ticks,2);   %scalefactor 1/17 for 1.6mag; 4/83 for 2.5mag
xlabel(hcolorBar,'mm/min') 

Please help me rectify this.

Thank you.

5 个评论
显示 3更早的评论隐藏 3更早的评论

Sunil S Hosakoti 2020-1-6

The coloarbar looks perfectly fine whe window size is small but when the window is maximised the values repeat. I have attached the snipped figures.

Any idea why this happens?

Adam 2020-1-7

When you resize a window the number of ticks generally changes so your number of tick labels may well become insufficient for the number of ticks. When this happens it repeats the labels you have given it for the extra ticks which do not have a label.

To deal with this you would likely have to add some code that responds to a figure resize event or simply choose how many ticks you want and hard code them, then create your tick labels from them and then when the window resizes it will not recalculate ticks.

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

Ganesh Regoti 2020-1-29

2
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/496860-repeating-values-on-colorbar#answer_412610

在 MATLAB Online 中打开

According to the doc, Tick mark labels, specified as a cell array of character vectors, a string array, a numeric array, a character vector, or a categorical array. By default, the colorbar labels the tick marks with numeric values. If you specify labels and do not specify enough labels for all the tick marks, then MATLAB® cycles through the labels.

Below is one workaround

close all; clc;
indexedImage = imread('cameraman.tif');
% Make it go from 0 - 2:
indexedImage = 2 * mat2gray(indexedImage);
imshow(indexedImage);
limColorBar = 2.0; 
colormap('hot');
caxis([0,limColorBar])
hcolorBar = colorbar(); 
hcolorBar.LimitsMode = 'manual';
hcolorBar.Limits = [0,limColorBar];
temp = hcolorBar.TickLabels;
hcolorBar.Ticks = [str2double(temp(1)) str2double(temp(2)) str2double(temp(3)) str2double(temp(4)) str2double(temp(5))];
hcolorBar.TickLabels = round((1/17)*hcolorBar.Ticks,2);   %scalefactor 1/17 for 1.6mag; 4/83 for 2.5mag

Another workaround

close all; clc;
indexedImage = imread('cameraman.tif');
% Make it go from 0 - 2:
indexedImage = 2 * mat2gray(indexedImage);
imshow(indexedImage);
limColorBar = 2; 
colormap('hot');
caxis([0,limColorBar])
hcolorBar = colorbar(); 
hcolorBar.LimitsMode = 'manual';
hcolorBar.Limits = [0,limColorBar];
hcolorBar.Ticks = linspace(0,limColorBar,5); %This depends on limcolorbar value
hcolorBar.TickLabels = round((1/17)*hcolorBar.Ticks,2);   %scalefactor 1/17 for 1.6mag; 4/83 for 2.5mag
xlabel(hcolorBar, 'mm/min') ;

Hope this helps!

1 个评论
显示 -1更早的评论隐藏 -1更早的评论

Sunil S Hosakoti 2020-2-6

It works, Thanks a lot.

请先登录，再进行评论。

Answer 2

Ruger28 2020-1-6

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/496860-repeating-values-on-colorbar#answer_408870

在 MATLAB Online 中打开

Using the example given by Image Analyst, I commented out the Limits lines of code, and it works as intended. Give that a try.

indexedImage = imread('cameraman.tif');
% Make it go from 0 - 2:
indexedImage = 2 * mat2gray(indexedImage);
imshow(indexedImage);
limColorBar = 2.0; 
colormap('hot');
caxis([0,limColorBar])
hcolorBar = colorbar(); 
% hcolorBar.LimitsMode = 'manual';
% hcolorBar.Limits = [0,limColorBar];
hcolorBar.TickLabels
hcolorBar.TickLabels = round((1/17)*hcolorBar.Ticks,2)   %scalefactor 1/17 for 1.6mag; 4/83 for 2.5mag
xlabel(hcolorBar, 'mm/min') 