swiching elements of same vector

hi everybody, i have vector

X=[ 20; 0; 0;0; 100; 0;0;0;50];

i would like to have

X=[0;0;0;0;20;0;0;0;100];

so that each number take the next number case

Answer 1

[Azzi Abdelmalek]

X=[ 20; 0; 0;0; 100; 0;0;0;50]
ii=find(X~=0)'
idx=circshift(ii,[0 1])
X(ii(2:end))=X(idx(2:end))
X(ii(1))=0

[jean claude]

it's good answer thanks very very much

Answer 2

[Jos (10584)]

Easy:

X = [20 0 0 0 100 0 0 50 0]'
[i,~,v] = find(X)
X(i) = [0 ; v(1:end-1)]

[jean claude]

easy way, good !