Index exceeds matrix dimensions problem with this code below :-

 c =
     1     1     1     6
     2     4     2    16
    -1     5    -4    -3

 N = length(c);
 tol= 1e-6;
 for ii=1:N-1
    for jj=ii+1:N
       if abs(c(jj,ii))> tol 
          fac=c(ii,ii) / c(jj,ii);
          c(jj,:) = fac*c(jj,:) - c(ii,:);
       end
    end
 end

how to solve this problem? that code for Gauss elimination when I press enter it appear " Index exceeds matrix dimensions "

Answer 1

[ANKUR KUMAR]

c =[1 1 1 6; 2 4 2 16; -1  5  -4 -3]
    N = size(c,1)
    M=size(c,2)
 tol= 1e-6;
 for ii=1:M-1
     ii
    for jj=ii+1:N
        jj
       if abs(c(jj,ii))> tol 
          fac=c(ii,ii) / c(jj,ii);
          c(jj,:) = fac*c(jj,:) - c(ii,:);
       end
    end
 end

Instead of writing length(c), you should to define the size along first and second dimension of matrix, i.e. define the number of row and columns of matrix.

Answer 2

[Walter Roberson]

length() of a 3 x 4 array is 4. length() is not the number of rows: length() is defined as:

• 0 if any dimension of the array is 0; or
• max() of size() of the array otherwise.