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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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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?

Akzeptierte Antwort

Jonathan Epperl
Jonathan Epperl am 2 Mai 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));
  3 Kommentare
Jonathan Epperl
Jonathan Epperl am 2 Mai 2013
You should make that a new question, and finally make it so that we can copy and paste your code into our matlab and run it and see what it is you want to achieve.

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Weitere Antworten (2)

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

Jonathan Epperl
Jonathan Epperl am 29 Apr. 2013
  3 Kommentare
Jonathan Epperl
Jonathan Epperl am 1 Mai 2013
Sure. Without knowing what your actual data looks like (it would still be nice if you could post a working minimal example), you could do that:
ylims = get(gca,'YLim');
axis tight
set(gca,'YLim',ylims);
Dirty, but should work.
Locks
Locks am 1 Mai 2013
Bearbeitet: Locks am 1 Mai 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?

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