modification about long matrix with for loop or while

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need urgent help,
assume u matrix 1st row all column is 30.
after each for loop I want to insert the new V values in u matrix new row start from 2nd column.
for example : operation 1 u=[ 30 30 30;0 0 0;0 0 0] // operation 2 (for loop i = 2) u become u=[ 30 30 30;0 5 5;0 0 0]
operation 3 (for loop i = 3) u become u=[ 30 30 30;0 5 5;0 6 6]
n = 109
m=11
u = zeros(m,n); u(1,:)= 30;
A=109 * 109 matrix, does not matter the numbers;
dy=0.01
for j=2:jm-1
for i =1:nm
B=-u(j-1,:);
V=A\B';
u(j,:)=V';
end
end

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