change scales from the x axis

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Locks
Locks 2013-5-2
Hi,
I intend to do a chart with two yaxis, the code is the following:
dates=datenum(dataSet(:,1));
%SPX
SPX=dataSet(:,2);
%VIX
VIX=dataSet(:,3);
plotyy(dates,SPX,dates,VIX);
%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)
ytix = get(gca,'YTick');
set(gca,'YTick',ytix(2:end));
This is working but unfortunately besides the years I have also the numeric date displayed on the x axis, how can I change that?
is there a way to make both y axis black instead of blue and green?

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Azzi Abdelmalek
Azzi Abdelmalek 2013-5-2
use
[ax,h1,h2]=plotyy(dates,SPX,dates,VIX);
set(ax(1),'ycolor','k')
set(ax(2),'ycolor','k')
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