数值计算非线性方程的数值解法的c++程序(Numerical calculation of nonlinear equations of the numerical solution of the c++ procedures).docVIP
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数值计算非线性方程的数值解法的c程序(Numericalcalculationofnonlinearequationsofthenumericalsolutionofthecprocedures)
数值计算非线性方程的数值解法的c++程序(Numerical calculation of nonlinear equations of the numerical solution of the c++ procedures) Experimental study of numerical calculation method to write the program, there are various kinds of method for solving nonlinear equations (dichotomy, a simple iterative method, Newton iterative method, secant method) of the C++ language, and GSL library function call method. To compile smoothly, you need to install and configure the GSL library. Compilation methods (Ubuntu): g++, nonline.cpp, -o, nonline, -lm, -lgsl, -lgslcblas / / iterative solution of nonlinear equations #include iostream #include cmath #include vector #include cstdlib #include gsl/gsl_roots.h #include gsl/gsl_errno.h #include gsl/gsl_math.h //#include mylib/MyClock.h Using namespace std; Const double INF = 999999; / / for Infinity / / function definition equation f (x) Double f (double x) { Return x*x*x - X - 1; } / / defined for GSL function using the function GF (x, NULL) Double GF (double, x, void * param) { Return x*x*x - X - 1; } / / definition iteration equation Double g (double x) { Return, pow ((1.0+x), 1.0/3.0); } / / derivative function definition Newton iterative method for F Double DF (double x) { Return 2*x*x - 1; } The guide function of DGF to GSL / / function definitions (x, NULL) Double DGF (double, x, void * param) { Return 2*x*x - 1; } / / the dichotomy solving nonlinear equations / / input parameters: expression, f- solution of the equation a, b- upper and lower bounds for the solution of the interval, eps- error //x is the result, if no solution or error is returned, inf returns the bool value, and returns true if the solution succeeds, / / false. otherwise. Bool, BinSolve (double (*fun) (double), double, a, double, B, double, EPS, double x) { Double M = 0; Int k = 0; Do { If (fun (a), *fun (b) 0) { X = INF; Return false; } If (fun (a) *fun (b) = = 0) { If (fun (a) = = 0) { Cout find a =, a, k =, kendl; X = a; } Else { Cout find B =, b, k =, kendl; X = b; } Ret
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