How can i write any vector for many time from short form??

i have a vector

 V1 = [ 45 -45 45 -45 45 -45 45 -45  45 -45 45 -45  45 -45 45 -45  45 -45]; 
 V2 = [0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0];

i want to enter just for 1 time 0 and multiple of 20 and automatically expand. for 45 and -45, just want to enter 45 and -45 and multiple of 9. and new vector v make automatically [V1, V2]; or suggest any program to automatically MATLAB ask to enter any value like 0 or 45 or -45... and how many times, and value how many times want to enter each value? and automatically create new vector

 V = [V1, V2....Vn] or V = [V(1), V(2)...V(n)];

Answer 1

[KSSV]

function V = formvec
a = input('Enter the array to repeat:') ;
N = input('Number of times to repeat:') ;

V = repmat(a,[1 N]);

[Triveni]

Tell me one thing more

 syms formvec
 value = [repmat([formvec], [1,11])] %number of required repeatation 1,2...

Convert formvec to variable. which directly run.

Answer 2

[KSSV]

    K1 = [45 -45] ;
    v1 = repmat(K1,[1 9]) ;

K2 = 0 ;
V2 = repmat(K2,[1 20]) ;
V3 = zeros(1,20) ;

doc repmat, zeros,ones etc.

[Triveni]

Can you tell me program to generate it automatically?

 N = input(' No of value to repeat');

generate repmat according to N and automatically ask value and number of value to be combine in v.

 v = [repmat([K1],[1 input1]),repmat([K2],[1 input2]),repmat([K3],[1 input3])]