Help with for loop for a matrix and lb,ub.

We have this code but troubles in the for-loops(described in the for loop):

f = [214 ; 91 ; 135 ; 260 ; 340 ; 125]; 

    A = [-1 -1 -1 -1 -1 -1];
    lb = [720, 432, 336, 216, 0, 120]; 
    ub = [1800, 1080, 840, 720, 360, 480]; 
   [x,fval,exitflag,output,lambda] = linprog(f,A,b,[],[],lb,ub)
    out=[];
  A = -out;
  load varmelast.txt
  bjan = varmelast(5:11);
  bjan_tot = mean(bjan);
  for i = 1:64

    if *%we need to write here that when there's a 0 in the matrix, lb and ub should also b zero. But How?*

    else *%and here, otherwise lb and ub are as written above. How do we do this?*********

    end

We also want to have several numbers in b, and want the matrix to run through all the b-values. We're guessing we need another for-loop but don't know how to do it. We need your help!! %behöver också kod för att köra hela A-matrisen för ALLA b-värden

[Jan]

The question is not clear. You are searching for "a 0 in the matrix" - in which matrix? lb cannot be zero, because it is a vector. Do you mean, that the element lb(i) is 0?