MATLAB: Index exceeds matrix dimensions. error. The code is pasted below. please help me resolve this error. Thank you.

index exceeds matrix dimensions

% This is the script for Generalized Hardy Cross Analysis

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Check lines:

A = [0 0 0 0 0; 0 -50.0 0 0 0] ;
A=0;
   b = ((s(i,j)))*(A(i,j));

You have initialized A as 2x5 matrix, and then you made it to scalar 0. In line b = ((s(i,j)))*(A(i,j), you are trying to access it as matrix. Change considering those lines.

Same is the case with B also.

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MATLAB: Someone correct me please! How can i plot with this codes to get the following graph

Here's a start, but what is N and x? And you didn't call plot(), so what, in this alphabet soup of a program, is being plotted along the x and y axes?

N = 100;  % Just a guess!!!
U = zeros(N*2+2);
A = zeros(N*2+2);
B = zeros(N*2+2);
C = zeros(N*2+2);
D = zeros(N*2+2);
Y = zeros(N*2+2);
onesN=1.0/N;
Re=5000;
EE=1.0;
t=0;
dt=EE*Re*N^2;
AA = -0.5 * EE;
BB = 1.0 + EE;
KKEND=12;
KKMOD=1;
Y(1)=0;
U(1)=0.0;
U(x)=1.0;
N=20
for j=2:N
  U(j)=0.0;
  A(1) = 1.0;
  B(1) = 1.0;
  C(1) = 1.0;
  D(1) = 1.0;
end
for j=2:N
  Y(j)=Y(j-1)+N;
  A(j)=AA;
  if j==N
    A(j)=0.0;
    D(j)=BB;
    B(j)=AA;
  end
  if j==2
    B(j)=0.0;
    C(j)=1.0-EE*U(j)+0.5*EE*U(j+1)+U(j-1);
  end
  if j==N
    C(j)=C(j)-AA*U(x);
  end
end
for j=3:N
  D(j)=D(j)-B(j)*A(j-1)/D(j-1);
  C(j)=C(j)-C(j-1)*B(j)/D(j-1);
  for k=2:N
    M=N-(k-2);
    U(M)=(C(M)-A(M)*U(M+1))/D(M);
    Y(1)=0.0;
    Y(x)=Y(N)+N;
    t=t+dt;
  end
end

MATLAB: How to create the definite cycle and to display the result of a cycle in a single matrix of a definite size

A = eye(7).*repmat(1:7,7,1);
[x,y] = size(b);
m = zeros(7*x,7*y);
for i = 1:x
  for j = 1:y
    if (b(i,j) == 0)
       m((i-1)*7+1:i*7,(j-1)*7+1:j*7) = 0;
    else
       m((i-1)*7+1:i*7,(j-1)*7+1:j*7) = circshift(A,(-1)*b(i,j)+1);
    end
  end
end

This will do it.

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