k-NN search. What is the difference between these 2-codes ?

Question

Pramod Bhat 2012-2-15

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/29219-k-nn-search-what-is-the-difference-between-these-2-codes

    {
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)