Second-order differential equations, using the Runge-Kutta method to solve the second-order reduced to an order after solving.

Second Order Runge-Kutta Code
.............................\data.txt
.............................\Debug
.............................\.....\DF60.PDB
.............................\.....\g.obj
.............................\.....\main.obj
.............................\.....\rk.exe
.............................\.....\rk.pdb
.............................\jcl.xls
.............................\jlc2.xls
.............................\lq.xls
.............................\main.f90
.............................\rk.dsp
.............................\rk.dsw
.............................\rk.opt
.............................\rk.plg
.............................\rk4(系数矩阵).txt
.............................\rk4代码.txt
.............................\rt4(系数未用矩阵).txt
.............................\solve-rt4.dat
.............................\solve-rt4.txt

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