Finding H1 error for time dependent non linear pde

1

Hi all , I am not able to find H1 error for my time dependent non linear pde. I am using the following code:

error_H1 = errornorm(u_e, u, norm_type = 'H1')

As we know the order of convergence is 1 for H1 norm but what I am getting is more than 1 . I am taking h = k , where k is time step parameter and h is space parameter.
Thank you in advance.

2

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