The Trendy application is being retired in the new year. The new web application, ThingSpeak, offers similar functionality. We recommend that active Trendy users who are looking to create new trends use ThingSpeak. To begin collecting your data in ThingSpeak, please read the tutorial : ThingSpeak for Trendy users. Although Trendy no longer allows the creation of new trends, the application will still remain accessible until January 13, 2016. Until that date, you can view your current trends and download your data. After that date, your data will no longer be accessible. Thanks for using Trendy and we encourage you to check out ThingSpeak.

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Where are they now? Amazon's best-sellers on 2/22/12.

The Amazon best-seller rankings for six books. The books chosen were #1, #11, #21, #31, #41, and #51 on Feb 22, 2012 (when this plot and the associated trends were created).

Plot Image
% time1470 and data1470 available for use
% for Amazon best-seller's rank for #51-ranked book on 2/22/12
% 
% time1469 and data1469 available for use
% for Amazon best-seller's rank for #41-ranked book on 2/22/12
% 
% time1468 and data1468 available for use
% for Amazon best-seller's rank for #31-ranked book on 2/22/12
% 
% time1467 and data1467 available for use
% for Amazon best-seller's rank for #21-ranked book on 2/22/12
% 
% time1466 and data1466 available for use
% for Amazon best-seller's rank for #11-ranked book on 2/22/12
% 
% Amazon best-seller's rank for #1-ranked book on 2/22/12
%   time vector is: time1465
%   data vector is: data1465

for k = 65:70
  n = ['14',num2str(k)];
  eval(['idx = data',n,'==0;']);
  eval(['data',n,'(idx) = [];']);
  eval(['time',n,'(idx) = [];']);
end
% data1465(data1465==0) = NaN;
% data1466(data1466==0) = NaN;
% data1467(data1467==0) = NaN;
% data1468(data1468==0) = NaN;
% data1469(data1469==0) = NaN;
% data1470(data1470==0) = NaN;

subplot(2,1,1)
semilogy(time1465,data1465,time1466,data1466,time1467,data1467,time1468,data1468,time1469,data1469,time1470,data1470);
datetick
xlabel('Date'), ylabel('Rank')
set(gca,'YDir','reverse')
subplot(2,1,2)
plot(time1465,data1465,time1466,data1466,time1467,data1467,time1468,data1468,time1469,data1469,time1470,data1470);
datetick
ymx = median([max(data1465),max(data1466),max(data1467),max(data1468),max(data1469),max(data1470)]);
ylim([0,100*ceil(ymx/100)])
xlabel('Date'), ylabel('Rank')
set(gca,'YDir','reverse')
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