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Google vs. Apple Stock Prices (normalized)

This plot is broken.

Index exceeds matrix dimensions.

Plot to show Apple's stock price vs. Google's. I'd like to throw some other indicators in there as well...

Plot Image
% Google Stock Price
%   time vector is: time1453
%   data vector is: data1453
% Apple Stock Price
%   time vector is: time1454
%   data vector is: data1454

horizon = 90;

keep = time1453 > (now-horizon);
time1453 = time1453(keep);
data1453 = data1453(keep);

keep = time1454 > (now-horizon);
time1454 = time1454(keep);
data1454 = data1454(keep);

hold all
plot(time1454,100*data1454/data1454(1))
plot(time1453,100*data1453/data1453(1))
hold off
datetick
title('Apple vs. Google: Normalized Stock Price')
ylabel(sprintf('Price (price on %s = 100)',datestr(now-horizon,1)))
legend({'Apple','Google'},'Location','NorthWest')
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2 comments

Sharp drops are due to stock splits. Probably should take that into account in the plotting.

Normalised to what?