how to prevent overwriting in matrix while creating in for loop?

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T(1,1) = (a-b-c);
T(1,2)=b;
T(2,1) = c;
C(1) = a*To;
for j= 2:1:nx-1
i=1;
%middle nodes
T(i,j-1) = b/2;
T(i,j) = 2*a-b-2*c;
T(i,j+1) = b/2;
T (i+1,j+1) = 2*c;
C(j) = 2*a*To;
T(i,j)=0;
end
%end node
T(1,nx-1) = b;
T(1,nx) = b + c + a;
T(2,nx) = c;
C(nx) = a*To;
%sliding
for i = 2:1:nysl
for j= 2:1:nx
if(i<=nysl-1 && j==1);
T(i-1,j)=1;
T(i,j)= -4;
T(i+1,j)=1;
T(i,j+1)=2;
elseif (i<=nysl-1 && j<=nx-1);
T(i-1,j) =1;
T (i,j-1) =1;
T(i,j) =-4;
T(i,j+1)= 1;
T(i+2,j)=1;
elseif (i<=nysl-1 && j==nx);
T(i-1,j) =1;
T (i,j-1) =2;
T(i,j) =-4;
T(i+1,j)= 1;
else
T(i,j)=0;
end
end
end
while creating the matrix the successive operation overwrites the values allocated previously.Is there anyway to void the overwriting?
  1 Commento
Stephen23
Stephen23 il 11 Dic 2016
Modificato: Stephen23 il 11 Dic 2016
"Is there anyway to avoid the overwriting?"
Yes. Simply preallocate an output array of the correct size, and use indexing to assign the new values within the loop. You will find lots of examples online.

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