Heatmap plot temperature vs time

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I need to create a heatmap showing the temperature trend as a function of time acquired from ten sensors equally spaced. I have tried to plot it starting from a two columns matrix where the first one is a vector relevant to time while the second one is the corresponding temperature. I have tried with the following code:
heatmap(tbl,'time','temperature','Colormap',redbluecmap);
However, it shows me this error message: The name 'time' is not an accessible property for an instance of class 'matlab.graphics.chart.HeatmapChart'.
How can I fix it?
I should obtain something similar to this:
  1 Comment
Walter Roberson
Walter Roberson on 28 Aug 2022
What shows up for
class(tbl)
tbl.Properties.VariableNames

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Accepted Answer

Abderrahim. B
Abderrahim. B on 28 Aug 2022
Hi!
I know what is the issue. You have a timetable not a table and the first column related to time is not considered as variable . Solution: Convert to table
Demo below:
clear
MeasurementTime = datetime({'2015-12-18 08:03:05';'2015-12-18 10:03:17';'2015-12-18 12:03:13'});
Temp = [37.3;39.1;42.3];
Pressure = [30.1;30.03;29.9];
WindSpeed = [13.4;6.5;7.3];
TT = timetable(MeasurementTime,Temp,Pressure,WindSpeed)
TT = 3×3 timetable
MeasurementTime Temp Pressure WindSpeed ____________________ ____ ________ _________ 18-Dec-2015 08:03:05 37.3 30.1 13.4 18-Dec-2015 10:03:17 39.1 30.03 6.5 18-Dec-2015 12:03:13 42.3 29.9 7.3
TT = timetable2table(TT) ;
heatmap(TT, "MeasurementTime", "Temp")
  3 Comments
Walter Roberson
Walter Roberson on 28 Aug 2022
The error they received would be consistent with the possibility that they had previously done
tbl = heatmap(...)
and are now trying to do
heatmap(tbl, ...)

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