How to make two vectors the same size?

I wrote these codes, I splitted the dataset(colon attached) into two parts (data1 and data2) based on the last column(1 or else)and make the columns equal to each others.

clc;
clear;
close all;
tic
load colon.mat 
data=colon; 
[n,m]=size(data);
d=10;
l=1;
t=1;
data1=[];
data2=[];
for i=1:n
    if data(i,m)==1
        data1(l,:)=data(i,1:m-1);
        l=l+1;
    else
        data2(t,:)=data(i,1:m-1); 
        t=t+1;
    end
end
if t>l
    data1(l:t-1,1:m-1)=0;
else
    data2(t:l-1,1:m-1)=0;
end
 for i=1: m-1                      
    thisCol1=data1(:,i);      
    thisCol2=data2(:,i);
    a18(i)=fKLDDist(thisCol1,thisCol2);
     end

and then in for loop I computed the distance value between the data1 and data2 and for computation I defined a function fKLDDist (I attached the image of the formula)but I found the error.

function [ fkld ] = fKLDDist( p,q )
%UNTITLED Summary of this function goes here
%   Detailed explanation goes here
fkld=sum(dot(p,log(p/q)));

end

the error is:

Error using dot (line 33)
A and B must be same size.

Error in fKLDDist (line 4)
fkld=sum(dot(p,log(p/q)));

Error in myFSmethod (line 56)
  a18(i)=fKLDDist(thisCol1,thisCol2);

because I used dot(p,log(p/q)) in the function,matlab said A and B must be same size but I don't know how to make p and log(p/q) the same size.I'll be very gratefull to have your opinions. Thanks

Answer 1

[Fabio Freschi]

Try

fkld=sum(dot(p,log(p./q)));

with the element-wise division ./

[phdcomputer Eng]

@Fabio Freschi Thanks greatly for your attention. the problem of the function in my question is solved by your advice, but for one function It has error:

function [ fkdg ] = fKDivergence( p,q )

fkdg=sum(p.*(log((2.*p)/(p+q))));

end

I used element-wise for several functions and their errors solved.

I used element-wise operator .* in the codes but MATLAB shows this error

Error using .*

Matrix dimensions must agree.

Error in fKDivergence (line 5)

fkdg=sum(p.*(log((2.*p)/(p+q))));

I'll be very gratefull to have your opinion. Thanks