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Asked by Pramod Bhat
on 15 Feb 2012

{ The program for k-NN search in MATLAB. load fisheriris %inbuilt data set provided in MATLAB. x = meas(:,3:4); gscatter(x(:,1),x(:,2),species) set(legend,'location','best') newpoint = [5 1.45]; line(newpoint(1),newpoint(2),'marker','x','color','k',... 'markersize',10,'linewidth',2) [n,d] = knnsearch(x,newpoint,'k',10) %my doubt is here. line(x(n,1),x(n,2),'color',[.5 .5 .5],'marker','o',... 'linestyle','none','markersize',10) %modified program for my requirement with different data set. x and z are the two variables with 24 elements in each. load stroke gscatter(x,z,species); set(legend,'location','best') newpoint=[115,150]; line(newpoint(1),newpoint(2),'marker','x','co lor','k',... 'markersize',10,'linewidth',2); [n,d] = knnsearch(x,newpoint,'k',10) % when i run , it gives error here. what is the difference between the original code and modified code ? infact 'newpoint' in the original program is a vector. line(x(n,1),x(n,2),'color',[.5 .5 .5],'marker','o',... 'linestyle','none','markersize',10)

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Answer by Tom Lane
on 15 Feb 2012

Accepted answer

You have supplied only x, not [x z], as the first argument to knnsearch. Your newpoint vector, on the other hand, has two columns.

Shaik Ghouse Basha
on 8 Sep 2013

How to predict data using KNN ?

I have a vector of 80 years of data. I want to predict for 30 years. Please let me know how it is possible to using KNN?

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