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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);

a24(i)=fkumarjohnson(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 fkumarjohnson (I attached the image of the formula)but I found the error.

function [ fkj ] = fkumarjohnson(p,q )

%UNTITLED Summary of this function goes here

% Detailed explanation goes here

fkj=sum(((p*p-q*q).^2)/(2*(dot(p,q)).^(3/2)));

end

the error is:

Error using *

Inner matrix dimensions must agree.

Error in fkumarjohnson (line 4)

fkj=sum(((p*p-q*q).^2)/(2*(dot(p,q)).^(3/2)));

Error in myFSmethod (line 62)

a24(i)=fkumarjohnson(thisCol1,thisCol2);

The matlab said the inner matrix dimensions of two sides of * must agree but I don't know how to make their dimensions equal.I'll be very gratefull to have your opinions. Thanks

Fabio Freschi
on 10 Dec 2019

fkj= sum(.5*((p.^2-q.^2).^2)./((p.*q).^1.5));

Note that .^ .* and ./ operators are used for element-wise operation (see also Stephen's comment).

Note also that dot can give apparently unexpected results for complex inputs (see dot help)

Fabio Freschi
on 11 Dec 2019

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Image Analyst
on 11 Dec 2019

The error is described in the FAQ

Image Analyst
on 11 Dec 2019

Cell arrays were the first FAQ entry. The link I gave you should have sent you directly to the error on "Inner dimensions must agree". It does for me. Perhaps you didn't give it enough time to scroll to the right part of the page.

Anyway the error was caused by you trying to do a matrix division instead of an element-by-element division. Using ./ like Fabio said will fix it.

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