"Check for incorrect argument data type or missing argument in call to function 'X'. Error in sum=sum+A(j,h)*X(h)

output= ('Gaussian Elimination Method')
A=input ('Enter your coefficient Matrix')
b=input ('Enter your space vector')
N=length(b);
x=zeros(N,1);
for j=1:1:N-1 %Forward Elimination
    for i = j+1:1:N
        m=A(i,j)/A (j,j);
        A(i,:)=A(i,:)- m*A(j,:)
        b(i) = b(i) - m*b(j)
    end
end
disp([A,b]);
for j=N:-1:1%Backward Elimination
    sum=0;
    for h=1+1:1:N      
        sum=sum+A(j,h)*X(h);
    end
    X(j)=(b(j)-sum)/A(j,j);
end
disp(X);

Answer 1

[Chunru]

output= ('Gaussian Elimination Method')

output = 'Gaussian Elimination Method'

% A=input ('Enter your coefficient Matrix')
% b=input ('Enter your space vector')
A = randn(3,3);
b = randn(3,1)

b = 3×1

-1.0379 0.3246 0.2563

N=length(b);
X=zeros(N,1);       % upper case X (use case carefully)
for j=1:1:N-1 %Forward Elimination
    for i = j+1:1:N
        m=A(i,j)/A (j,j);
        A(i,:)=A(i,:)- m*A(j,:)
        b(i) = b(i) - m*b(j)
    end
end

A = 3×3

-1.6440 0.8403 -0.7771 0 -1.4609 -0.1171 -0.6397 0.9495 -0.2362

b = 3×1

-1.0379 0.4488 0.2563

A = 3×3

-1.6440 0.8403 -0.7771 0 -1.4609 -0.1171 0 0.6225 0.0662

b = 3×1

-1.0379 0.4488 0.6602

A = 3×3

-1.6440 0.8403 -0.7771 0 -1.4609 -0.1171 0 0 0.0163

b = 3×1

-1.0379 0.4488 0.8514

disp([A,b]);

   -1.6440    0.8403   -0.7771   -1.0379
         0   -1.4609   -0.1171    0.4488
         0         0    0.0163    0.8514

for j=N:-1:1%Backward Elimination
    s=0;          % try not use sum as variable as it is a built in function
    for h=1+1:1:N      
       s=s+A(j,h)*X(h);
    end
    X(j)=(b(j)-s)/A(j,j);
    end
disp(X);

  -26.3721
   -4.4960
   52.2675

[Avelon Jr Eugenio]

thanks a lot.