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Function returning incorrect value
Hi all! I'm trying to model a differential equation having to do with free fall, using RK4 and Fortran 90. The equation is: \ddots{y}(t)=-g \frac{R^2}{y^2} The code is attached in caidalibre.f90 The big problem is that function f(y,v,t) returns an unexpected value within the main program...
