Left and right sides have different number of elements error (Matrices, data handling).

function z_hat = knnclassify_bme(y,X,T,k)
    m = size(T,1);
    n = size(X,1);
    z_hat = zeros(m,1);
    distance = zeros(n,1);
    for itor = 1:m
        for jtor = 1:n
            distance(jtor) = pdist([X(jtor,:)';T(itor,:)']);
        end
        [val, ind] = sort(distance);
        l = y(ind(1:k),:)';
        z_hat(itor) = mode(l);    
    end
return

%%%%This is what the code should do
%
% Name: knnclassify_bme
%
% Inputs:
%    y - A n-by-1 vector of class labels, corresponding to data points in X
%    X - A n-by-p data matrix
%    T - A m-by-p matrix of reference points, without/needing class labels
%    k - A scalar (1-by-1) value indicating the number of nearest neighbors
%        to be considered.
% Outputs:
%    z_hat - A m-by-1 vector of estimated class labels for data points in T
%
% Created by: Adam C. Lammert (2020)
% Author: ??? (you)
%
% Description: Determine estimated class labels for a matrix of 
%               reference points T, given data points X and labels y


%%I'm not sure where my code is going wrong, but I keep getting error on the pdist line whenever I'm trying to call the function.

Answer 1

[Sudhakar Shinde]

You could try to store result in cell { } :

for jtor = 1:n
  distance{jtor} = pdist([X(jtor,:)';T(itor,:)']);
end

or you could try for:

for jtor = 1:n
  distance{end+1} = pdist([X(jtor,:)';T(itor,:)']);
end

you need to initilize distance={}; before starting loop.