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Can someone please help with following conversion :

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Aswas
Aswas 2015-7-12
评论： Walter Roberson 2015-7-12
_ 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 2015-7-12
datetime was introduced since Matlab 2014b, what is your Matlab version?

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Walter Roberson
Walter Roberson 2015-7-12
datetime() was introduced in R2014b; you probably have a version earlier than that.
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Aswas
Aswas 2015-7-12
编辑：Azzi Abdelmalek 2015-7-12
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 2015-7-12
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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