adding year to plot using datetick

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I have created a plot for a volatility measure, now i want to add the years of the measure to the x axis. I have the appropriate year in a .txt file which i have loaded into the variable 'dates'. However i can not get the labels onto my plot
plot(1:iNumObs,exp(vLogVolsBF),'r:')
xlabel('Trading days since 2000-01-03')
ylabel('Volatility')
title('Particle filter estimate of volatility');
datetick('dates','yyyy');
It returns the error:
??? Error using ==> datetick>parseinputs at 344 The axis must be 'x','y', or 'z'.
Error in ==> datetick at 109 [axh,nin,ax,dateform,keep_ticks,keep_limits] = parseinputs(varargin);
Thank you

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DoVile Last Name:
DoVile Last Name: il 11 Lug 2012
Thank you for your answer, it is the second case that is relevant. My data consists of 3081 observations, having loaded the year for each observation into the variable 'dates' i thought i was trying to do exactly as you suggest using datetick('dates','yyyy'); after my plot ?
  3 Commenti
DoVile Last Name:
DoVile Last Name: il 11 Lug 2012
ahh that makes sense, but then how does the function know where i have stored the dates ?
I the original question i wrote: "I have the appropriate year in a .txt file which i have loaded into the variable 'dates'". To be perfectly clear, in the variable dates i have a list of years as long as the list of observations and indicating which year these observations are from.
Kelly Kearney
Kelly Kearney il 11 Lug 2012
The datetick function assumes that the values on your x-axis are datenumbers. So, in your case, rather than using 1:Nobs as your x values when calling plot, you should use
plot(dates, exp(vLogVolsBF),'r:');
datetick('x', 'yyyy');
This is assuming that the "dates" variable actually holds datenumbers (in the range of 730000 or so), rather than year numbers. Look at the help for datenum to get a better understanding of this.

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Più risposte (1)

John Petersen
John Petersen il 11 Lug 2012
Modificato: John Petersen il 11 Lug 2012
You have 1:iNumObs as the x-axis. I assume this is where you want the years. If your data is on a yearly basis, just add the first year (-1) to the x-axis
plot(1999+[1:iNumObs], exp(vLogVolsBF),'r:')
If your data is throughout the year but you just want a label for each year, then you need the date of each data point. If it's in datenum for example, then you can use datetick to convert to the format you're looking for,
datetick('x','yyyy')

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