MATLAB: Help me echelon matrix

MATLABmatrix

I have a matrix:
   syms m  
   A = [1 2 3 4;2 -1 1 1;-1 4 3 2;1 2 0 m]
with m is the parameter I use rref command:
 rref(A)
 ans =
 [ 1, 0, 0, 0]
 [ 0, 1, 0, 0]
 [ 0, 0, 1, 0]
 [ 0, 0, 0, 1]
the parameter m was lost. How I can convert matrix A to echelon form that the parameter m is still kept. thanks you very much.

Best Answer

I suspect, after experimenting with multiple m, that the echelon form of this particular matrix is independent of m, e.g.,
>> m=1; A = [1 2 3 4;2 -1 1 1;-1 4 3 2;1 2 0 m]; rref(A)
ans =
       1     0     0     0
       0     1     0     0
       0     0     1     0
       0     0     0     1
>> m=10; A = [1 2 3 4;2 -1 1 1;-1 4 3 2;1 2 0 m]; rref(A)
ans =
       1     0     0     0
       0     1     0     0
       0     0     1     0
       0     0     0     1
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