adding year to plot using datetick
显示 更早的评论
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
采纳的回答
DoVile Last Name:
2012-7-11
0 个投票
3 个评论
John Petersen
2012-7-11
'x' refers to the axis, not the variable x. I don't see any variable called 'dates' defined in your question.
DoVile Last Name:
2012-7-11
Kelly Kearney
2012-7-11
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.
更多回答（1 个）
John Petersen
2012-7-11
编辑：John Petersen
2012-7-11
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')
类别
在 帮助中心 和 File Exchange 中查找有关 Dates and Time 的更多信息
2012-7-11
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!
Translated by 
