zero_itp, a C code which finds a zero of a scalar function of a scalar variable, starting from a change of sign interval, using the Interpolate/Truncate/Project (ITP) method, which has faster convergence than the bisection method.
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zero_itp is available in a C version and a MATLAB version and an Octave version.
bisection_rc, a C code which seeks a solution to the equation F(X)=0 using bisection within a user-supplied change of sign interval [A,B]. The procedure is written using reverse communication (RC).
fsolve_test, a C code which calls fsolve() which seeks the solution x of one or more nonlinear equations f(x)=0.
root_rc, a C code which seeks a solution of a scalar nonlinear equation f(x) = 0, or a system of nonlinear equations, using reverse communication (RC), by Gaston Gonnet.
test_zero, a C code which implements test problems for the solution of a single nonlinear equation in one variable.
zero, a C code which seeks a solution of a scalar nonlinear equation f(x) = 0, by Richard Brent.
zero_rc, a C code which seeks a solution of a scalar nonlinear equation f(x) = 0, using reverse communication (RC), by Richard Brent.
Original pseudocode version presented on Wikipedia page "The ITP Method"; This version by John Burkardt.