24 hour time line plot for discrete data

How to create a 24 hour time line plot for discrete data that can be color coded like the following image?

Summer Winter 0:00 7.7 6.4 1:00 7.7 6.4 2:00 7.7 6.4 3:00 7.7 6.4 4:00 7.7 6.4 5:00 7.7 6.4 6:00 12.2 21.7 7:00 12.2 21.7 8:00 12.2 7.8 9:00 12.2 7.8 10:00 12.2 7.8 11:00 12.2 7.8 12:00 12.2 7.8 13:00 12.2 7.8 14:00 12.2 7.8 15:00 40.5 7.8 16:00 40.5 7.8 17:00 40.5 7.8 18:00 40.5 21.7 19:00 12.2 21.7 20:00 12.2 7.8 21:00 12.2 7.8 22:00 7.7 6.4 23:00 7.7 6.4

Answer 1

[Star Strider]

The contourf function can get you there. You can choose the appropriate colormap or create your own.

Try something like this --

 Summer_Winter  =  ["0:00  7.7  6.4    1:00  7.7  6.4    2:00  7.7  6.4    3:00  7.7  6.4    4:00  7.7  6.4    5:00  7.7  6.4    6:00  12.2  21.7    7:00  12.2  21.7    8:00  12.2  7.8    9:00  12.2  7.8    10:00  12.2  7.8    11:00  12.2  7.8    12:00  12.2  7.8    13:00  12.2  7.8    14:00  12.2  7.8    15:00  40.5  7.8    16:00  40.5  7.8    17:00  40.5  7.8    18:00  40.5  21.7    19:00  12.2  21.7    20:00  12.2  7.8    21:00  12.2  7.8    22:00  7.7  6.4    23:00  7.7  6.4"]

Summer_Winter = "0:00  7.7  6.4    1:00  7.7  6.4    2:00  7.7  6.4    3:00  7.7  6.4    4:00  7.7  6.4    5:00  7.7  6.4    6:00  12.2  21.7    7:00  12.2  21.7    8:00  12.2  7.8    9:00  12.2  7.8    10:00  12.2  7.8    11:00  12.2  7.8    12:00  12.2  7.8    13:00  12.2  7.8    14:00  12.2  7.8    15:00  40.5  7.8    16:00  40.5  7.8    17:00  40.5  7.8    18:00  40.5  21.7    19:00  12.2  21.7    20:00  12.2  7.8    21:00  12.2  7.8    22:00  7.7  6.4    23:00  7.7  6.4"

 tc = regexp(Summer_Winter, '\d+:\d+', 'match');
 TimeTable = table(datetime(tc,InputFormat='HH:mm', Format='HH:mm').');
 % disp(Timestr)
 SW = regexp(Summer_Winter, '\d*\.\d*', 'match');
 
 SWT = str2double(reshape(SW, 2, [])).';
 Summer_Winter_T = [TimeTable array2table(SWT)];
 Summer_Winter_T.Properties.VariableNames={'Time','Summer','Winter'}

Summer_Winter_T = 24×3 table
    Time     Summer    Winter
    _____    ______    ______

    00:00      7.7       6.4 
    01:00      7.7       6.4 
    02:00      7.7       6.4 
    03:00      7.7       6.4 
    04:00      7.7       6.4 
    05:00      7.7       6.4 
    06:00     12.2      21.7 
    07:00     12.2      21.7 
    08:00     12.2       7.8 
    09:00     12.2       7.8 
    10:00     12.2       7.8 
    11:00     12.2       7.8 
    12:00     12.2       7.8 
    13:00     12.2       7.8 
    14:00     12.2       7.8 
    15:00     40.5       7.8 

 Slvls = [0; sort(unique(Summer_Winter_T.Summer))];

Slvls = 4×1

0 7.7000 12.2000 40.5000

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 Wlvls = [0; sort(unique(Summer_Winter_T.Winter))];

Wlvls = 4×1

0 6.4000 7.8000 21.7000

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 figure
 surf(hour(Summer_Winter_T.Time)*[1 1], ones(size(Summer_Winter_T,1),2).*[1 2], Summer_Winter_T.Summer*[1 1])
 colormap(turbo)
 title('Summer (Surface Plot)')

 
 figure
 contourf(hour(Summer_Winter_T.Time)*[1 1], ones(size(Summer_Winter_T,1),2).*[2.5 3.0], Summer_Winter_T.Summer*[1 1], Slvls)
 hold on
 contourf(hour(Summer_Winter_T.Time)*[1 1], ones(size(Summer_Winter_T,1),2).*[1.5 2.0], Summer_Winter_T.Winter*[1 1], Wlvls)
 hold off
 colormap(turbo)
 ylim('padded')
 xlabel('Clock Time')
 yticks([1.75 2.75])
Ax = gca;
% get(Ax)
yticklabels(Ax,{'Winter','Summer'})

See the contourf documentation for details.

EDIT -- (21 Aug 2026 at 05:05)

Added Slvls and Wlvls.

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