help needed in cosine similarity method

Dear experts i want to implement cosine similarity method take an example i have a matrix

[2 3 4 5 1;1 2 3 4 2;4 5 1 1 2]

i want to predict value now i will hide one of them and use this method so far i have coded cosine method like this

clc;
clear all;
close all;
load('Sample.mat');
load('Sample_Hidden.mat');
A=Sample;
B=Sample_Hidden;

C=cosineSimilarityNaive(A);
options = [];
options.Metric = 'Euclidean';
options.NeighborMode = 'KNN';
options.bNormalized=1;
options.k = 5;
options.WeightMode = 'Cosine';