# changing the axis of a plot in a way that the data series starts at x=0 at a point at one point on the y-axis and ends on the right end of the plot

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Locks on 29 Apr 2013
hi,
I have this code:
dates=datenum(VIXdate)
y=VIX
plot(dates,y)
%datevc divides the date in different columns, first colum is the year,
%second the month and thrid the day
d=datevec(dates)
%Takes just the year (first column)
d=d(:,1)
%takes every year just once
[a,idx]=unique(d(:,1),'first')
ylabel('VIX');
set(gca,'xtick',dates(idx),'xticklabel',a)
set(gca,'Box','off')
this works fine, but the problem I faces is that the time series (y=VIX) does not start at the left end of the plot but instead there is a space between the y-axis and the first point of the time series. I know that when there are normal values on the x-axis, I can change it, but I am not able to do it with dates, what do I need to do?
Babak on 29 Apr 2013
Undefined function or variable 'VIXdate'.

Jonathan Epperl on 2 May 2013
This is still not a working example, the variable VIXdate is obviously unknown to us...
So the dirty way again:
ytix = get(gca,'YTick');
set(gca,'YTick',ytix(2:end));
Locks on 2 May 2013
Edited: Locks on 2 May 2013
ok, I did so, it's fine now, thanks

Mel on 1 May 2013
You could also set just the x axis to be the same as your data:
xlim([0 max(dates)])

Jonathan Epperl on 29 Apr 2013
axis tight
Locks on 1 May 2013
Edited: Locks on 1 May 2013
dates=datenum(VIXdate)
y=VIX
plot(dates,y)
d=datevec(dates)
%Takes just the year (first column)
d=d(:,1)
%takes every year just once
[a,idx]=unique(d(:,1),'first')
ylabel('VIX');
set(gca,'xtick',dates(idx),'xticklabel',a)
ylims = get(gca,'YLim');
axis tight
set(gca,'YLim',ylims);
set(gca,'Box','off')
it's working perfectly now, thanks!
in addition, it would be great if the number 0 on the y axis is not shown in the plot due to the fact that it's so near to the numbers on the x axis, is there a way to do that?