Error when fitting polyfit curve
3 Ansichten (letzte 30 Tage)
Ältere Kommentare anzeigen
Trying to plot a polynomial curve onto my time series but keeps coming up with 'Inputs must be floats, namely single or double'
This is the code I've got:
% plot time series
X = Months;
X = categorical({'March','April','May','June','July','August','November'});
M = reordercats(X,{'March','April','May','June','July','August','November'});
Y = AverageDO;
plot(M,Y,'*');
p = polyfit(M,Y,1);
The excel sheet attached is the timeseries data.
0 Kommentare
Akzeptierte Antwort
dpb
am 12 Dez. 2020
Bearbeitet: dpb
am 13 Dez. 2020
Error is exactly what it says--you wrote:
X = categorical({'March','April','May','June','July','August','November'});
M = reordercats(X,{'March','April','May','June','July','August','November'});
so M is a categorical variable which polyfit is not equipped to handle.
Use
>> M=month(datetime(string(X),'inputformat','MMM'))
M =
3 4 5 6 7 8 11
>>
or some other way to generate the months as numeric.
I THINK some of the Statistics and/or Curve Fitting toolbox routines may know how to handle categorical variables but I don't recall for absolute sure otomh.
0 Kommentare
Weitere Antworten (0)
Siehe auch
Kategorien
Mehr zu Time Series finden Sie in Help Center und File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!