Can someone please help with following conversion :

_ 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')

Answer 1

[Azzi Abdelmalek]

datetime was introduced since Matlab 2014b, what is your Matlab version?

[Aswas]

2014a, I see the point, assist please

[Azzi Abdelmalek]

Use

t = datestr(731885.75)

[Aswas]

Thank you sir, works, but how do I get the proper time reflected in my plots please?

Answer 2

[Walter Roberson]

datetime() was introduced in R2014b; you probably have a version earlier than that.

[Aswas]

Thanks, datestr works, but still can't figure how to change axis label to such though.

[Aswas]

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]

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');