Title for a color bar

Question

Mathan 2022-4-6

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1690300-title-for-a-color-bar

评论： Voss 2022-4-6

采纳的回答： Voss

在 MATLAB Online 中打开

Hi,

I have been trying to add title to my colorbar using the following lines of code:

col=colorbar;
colorbar('XTickLabel', {'10^{10}', '10^{11}', '10^{12}'}, 'XTick',log10(1e10):1:log10(1e12));
caxis([log10(1e10) log10(1e12)])
ylabel(col,'My Title')    

It however gives me a colorbar without the title. I then changed the position of the codes as:

colorbar('XTickLabel', {'10^{10}', '10^{11}', '10^{12}'}, 'XTick',log10(1e10):1:log10(1e12));
caxis([log10(1e10) log10(1e12)])
col=colorbar;
ylabel(col,'My Title')  

and this time it gives me the colorbar with the title but the xticks are not what I had mentioned.

Wondering what I am doing wrong here and why changing the sequence of codes have such a dramtic effect.

Thanks.

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Answer 1

Voss 2022-4-6

2
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https://ww2.mathworks.cn/matlabcentral/answers/1690300-title-for-a-color-bar#answer_936510

在 MATLAB Online 中打开

col = colorbar('XTickLabel', {'10^{10}', '10^{11}', '10^{12}'}, 'XTick',log10(1e10):1:log10(1e12));

caxis([log10(1e10) log10(1e12)])

ylabel(col,'My Title')

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Voss 2022-4-6

在 MATLAB Online 中打开

You're welcome!

Basically, each time you call colorbar a new colorbar is created, which deletes any previous colorbars you had, in this case.

Here's the three attempts (including mine), with comments explaining what happens with the colorbars:

% Try 1

figure()

% make a colorbar

col=colorbar;

% make another colorbar with these XTicks, etc.

% (deletes the 'col' colorbar)

colorbar('XTickLabel', {'10^{10}', '10^{11}', '10^{12}'}, 'XTick',log10(1e10):1:log10(1e12));

% col no longer exists:

ishandle(col)

ans = logical

0

% set the color limits of the axes

caxis([log10(1e10) log10(1e12)])

try

% ylabel the col colorbar that doesn't exist anymore -> error

ylabel(col,'My Title')

catch ME

disp(sprintf('Error in ylabel: %s',ME.message));

end

Error in ylabel: Incorrect number of input arguments

% Try 2

figure()

% make a colorbar with these XTicks, etc.

colorbar('XTickLabel', {'10^{10}', '10^{11}', '10^{12}'}, 'XTick',log10(1e10):1:log10(1e12));

% set the color limits of the axes

caxis([log10(1e10) log10(1e12)])

% make a new colorbar (has default XTicks etc.) -> old colorbar is deleted

col=colorbar;

% label the new colorbar -> ok but you don't have the old one anymore

ylabel(col,'My Title')

% Solution

figure()

% make a colorbar with these XTicks, etc., store it as 'col'

col = colorbar('XTickLabel', {'10^{10}', '10^{11}', '10^{12}'}, 'XTick',log10(1e10):1:log10(1e12));

% set the color limits of the axes

caxis([log10(1e10) log10(1e12)])

% ylabel colorbar col

ylabel(col,'My Title')

Mathan 2022-4-6

Wow - thank you for the detailed answer. Makes perfect sense.

Thanks once again!

Voss 2022-4-6

Happy to help!

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Title for a color bar

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