I have a problem with this code when i run

Hey guys can help me to rezolved my problem in this code .....

%Exercitiul 1

disp('Tema la MATLAB');
disp('Student: Stoian Andrei-Serban');
disp('Grupa:2105');
disp('Data:8.11.2017');

%Excercitul 2

v1=linspace(2,7,5);
disp('Vectorul liniar v1=');disp(v1);
v2=linspace(3,6,5);
disp('Vectorul liniar v2=');disp(v2);
v3=linspace(5,10,5);
disp('Vectorul liniar v3=');disp(v3);
v4=linspace(4,10,5);
disp('Vectorul liniar v4=');disp(v4);
v5=linspace(2,8,5);
disp('Vectorul liniar v5=');disp(v5);

%Exercitiul 3

A=[v1 v2 v3 v4 v5];
disp('Matrice generata de vectori este:->');disp(A);
disp('Diagonal principala a matricei este');disp(diag(A));

%Exercitiul 4

[a,b]=ind2sub(size(A),find (A>8));
disp('Linia este');disp(a);
disp('Coloana este');disp(b);

%Exercitiul 5

B=[-1 5.25 -0.8 7.85 6
    2 -0.25 10.5 0.75 0
    2 0.25 14.8 17.75 6.6
    6 8.5 6 12.5 4
    1 7.5 11.5 5.5 8];
disp('B='); disp(B);
C=A-B;
disp('C='); disp(C);
[c,d]=ind2sub(size(C),find(C==0));
disp('Nr. de linii') ;disp(c);
disp('Nr. de coloane');disp(d);

%Exercitiul 6

disp('Inversa matricei C este egala:-->');disp(C);
disp('Determinatul inversei lui C este:-->');disp(det(C'));

%Exercitiul 7

V=[28.3 -36.2 24.5 16.2 4.3];
r=V/r;
disp(r);

%Exercitiul 8

VV=v1+v2+v3+v4+v5;
disp(VV);
Radacina=roots(VV);
disp(Radacina);

%Exercitiul 9

n=4;
for i=1:n
    for j=1:(n+2)
        if i==7;D(i,j)=5;
        elseif abs(i-j)==1; D(i,j)=-2;
        else D(i,j)=4;
        end 
    end
end
disp(D);

%Exercitiul 10

sum=0;
k=1;
while (VV(k)<=35)&&(k<=length(VV))
    sum=sum+VV(k);
    k=k+1;
end

%Exercitiul 11
x=0.3:0.1;
f=exp(x)-(3.*x);
plot(x,f)

[Rik]

You can find guidelines for posting homework on this forum here.

[Jan]

@Stoian Andrei: You forgot to mention the problem. It is much easier to suggest a solution than to guess, what the problem is.

Answer 1

[Walter Roberson]

A=[v1; v2 ;v3 ;v4; v5];