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Look in the Fortran manual/textbook how to define 2-dimensional arrayhswshock said:How to define a matrix in G95
It's the same like in other programming languages. IMHO: it's basic question from numerical mathematics. Try first compute some steps on the paper amd when you understand how it works, then try to program it e.g in Fortran.how to iterate equation,ie,U(n+1)=dt/dx*mu*U