Can someone please help with following conversion :

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Aswas
Aswas am 12 Jul. 2015
Kommentiert: Walter Roberson am 12 Jul. 2015
_ Can someone please help with following conversion : _
t = datetime(731885.75,'ConvertFrom','datenum')
Undefined function 'datetime' for input arguments of type 'double'.
Error in Untitled (line 2)
t = datetime(731885.75,'ConvertFrom','datenum')

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Azzi Abdelmalek
Azzi Abdelmalek am 12 Jul. 2015
datetime was introduced since Matlab 2014b, what is your Matlab version?
  3 Kommentare
Aswas
Aswas am 12 Jul. 2015
Thank you sir, works, but how do I get the proper time reflected in my plots please?

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Weitere Antworten (1)

Walter Roberson
Walter Roberson am 12 Jul. 2015
datetime() was introduced in R2014b; you probably have a version earlier than that.
  3 Kommentare
Aswas
Aswas am 12 Jul. 2015
Bearbeitet: Azzi Abdelmalek am 12 Jul. 2015
Sorry am new to Matlab, just doing practice run with small data before starting on my assignment,imported excel sheet, loaded code, can't get time right on my plot please...
%%Allocate imported array to column variable names
timeprac = data(:,1);
windspeedprac = data(:,2);
Pressureprac = data(:,3);
Tempprac = data(:,4);
%%Clear temporary variables
clearvars data raw;
%%vv
displaytime = datestr(timeprac);
plot(windspeedprac,timeprac),title('Wind Speed versus time'),xlabel('wind speed (km/hr)'),ylabel('time t (HH:MM:SS)');
datetick('y')
_ error: _
Error in dateTickPicker (line 104)
yrHigh = datenum(yearHigh,1,1);
Error in datetick>bestscale (line 292)
[labels,format] = dateTickPicker(axh,[xmin,xmax],dateform,dateChoice,axVal);
Error in datetick (line 253)
[ticks,dateform] = bestscale(axh,ax,vmin,vmax);
Error in PracCode (line 22)
datetick('y')
Walter Roberson
Walter Roberson am 12 Jul. 2015
The convention is that the independent variable should go on the x axis and the dependent variable should go on the y axis. Does windspeed lead to a change in time, or does time lead to a change in windspeed?
plot(timeprac, windspeedprac);
title('Wind Speed versus time');
xlabel('time t (HH:MM:SS)');
ylabel('wind speed (km/hr)');
datetick('x', 'HH:MM:SS');

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