MATLAB: Plotting timetable data in a barchart

timetable to barchart

Hi there,

I am a bit new to matlab but I am trying to plot data in a timetable. My data below is the date, average temperature and the standard deviation. Any ideas on how I would plot a bar graph of date on the x axis and temperature on the y? I was not sure if I had to convert my data from the timetable to either a string or back to a vector. I currently am recieving an error stating

A table variable subscript must be a numeric array containing real positive integers, a logical array, a character vector,

a string array, or a cell array of character vectors.

Any advice is greatly appreciated!!

Best Answer

You forgot to share your code, but it appears you are indexing your timetable incorrectly. See this page on how to access data in a table. Something like this should work.

bar(dataTT.t,dataTT.Temperature)

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Hi Jason,

you can use "text" command to print text into a bargraph. You have to build the string using your y values. For the vertical oriantaion you can set the property of the text handle to

text(x,y,'String','Rotation',90);

Gerd

MATLAB: Timetable 2 table error

Don't need to convert, plot() is overloaded to be datetime aware. Just use the t-table time variable (presuming that's what you want to plot other variable(s) against) as the X and the selected others as the y argument(s).

Example concocted from the documentation example for illustration:

Date = datetime({'2015-12-18';'2015-12-18';'2015-12-18'});
StormDuration = [hours(1);hours(2);hours(12)];
Temp = [37.3;39.1;42.3];
Pressure = [29.4;29.6;30.0];
Precip = [0.1;0.9;0.0];
TT = timetable(Temp,Pressure,Precip,StormDuration,'RowTimes',Date+StormDuration);
>> TT  % show what got...
TT =
  3×4 timetable
            Time            Temp    Pressure    Precip    StormDuration
    ____________________    ____    ________    ______    _____________
    18-Dec-2015 01:00:00    37.3    29.4        0.1        1 hr        
    18-Dec-2015 02:00:00    39.1    29.6        0.9        2 hr        
    18-Dec-2015 12:00:00    42.3      30          0       12 hr        
>> 
% now plot the temperature variable
plot(TT.Time.StormDuration,TT.Temp,'*-')
hold on  % get ready to add to plot
plot(TT.Time,TT.Precip,'x-')
As long as same variable type, can concatenate and plot them together as well...
figure  % new figure
plot(TT.Time,[TT.Temp TT.Pressure TT.Precip],'*-')

Best Answer

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