Type Mismatch error

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Author Message   Dave Gregory (dave) Junior Member Username: dave Post Number: 3 Registered: 02-2008 Posted on Wednesday, March 12, 2008 - 07:24 pm:    Hi, I am trying to solve Richards equation,when i run the code it gives type mismatch error.I didn't understand what this error means and how can i correct this error. van_new.pde (1.2 k)   Robert G. Nelson (rgnelson) Moderator Username: rgnelson Post Number: 1082 Registered: 06-2003 Posted on Thursday, March 13, 2008 - 01:03 am:    1. I don't get a type mismatch when I run your script. I get an invalid floating point operation, because you are trying to take a negative number to the power 2.0526. Fractional powers are implemented as exp(ln(arg)*power), and negative arguments are illegal. Your C function is ill-behaved. You might want to construct a separate script to compute an plot the values of C. 2. You also have a 1D equation applied on a 2D domain. This allows oscillation in the unused dimension. You should pose it as a 1D domain, or include a diffusion term in the unused dimension to damp oscillations. In the attached script, I have converted to a 1D domain and clamped the argument of ()^q. van_new1.pde (1.2 k)