How can I modify the datetime ticks used in heatmaps

Question

Gayan Lankeshwara 2020-8-21

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https://ww2.mathworks.cn/matlabcentral/answers/582569-how-can-i-modify-the-datetime-ticks-used-in-heatmaps

评论： Gayan Lankeshwara 2020-8-28

I am using datetime ticks to represent the x-axis as given in the following MWE code.

%% random heatmap
h1 = heatmap(rand(60))
%% generating the array for the x axis
tstart = datetime(2020,08,21,15,01,0);
tend = datetime(2020,08,21,16,00,0);
x_time = tstart: minutes(1): tend 
x_time.Format = 'HH:mm'
%% changing the x ticks to be the time 
h1.XDisplayLabels = x_time ;

Instead of displaying all the xtick labels, how can I only show the xtick labels every 10 mins, something similar to this {15:10, 15:20, ...}.

I tried this, but using mode function is impossible with datetime date I guess.

In addition to that, I want to change the ticks in the colorbar of the heatmap to be something like 'foo 0.1' instead of 0.1.

Could you please help me to sort this out ?

Thank you.

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Answer 1

Jyotsna Talluri 2020-8-25

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https://ww2.mathworks.cn/matlabcentral/answers/582569-how-can-i-modify-the-datetime-ticks-used-in-heatmaps#answer_484487

在 MATLAB Online 中打开

The below code helps

CustomXLabels = string(x_time);
% Replace all but the tenth elements by spaces
CustomXLabels(mod(minute(x_time),10) ~= 0) = " ";
% Set the 'XDisplayLabels' property of the heatmap object 'h1' to the custom x-axis tick labels
h1.XDisplayLabels = CustomXLabels;
 
axs = struct(gca);
cb = axs.Colorbar;
cb.TickLabels = {'foo 0.1','foo 0.2','...'};