# zero_chandrupatla

zero_chandrupatla, an Octave code which finds a zero of a scalar function of a scalar variable, starting from a change of sign interval, using the Chandrupatla method, which can converge faster than bisection, regula falsi, or Brent's method, by Tirupathi Chandrapatla.

### Languages:

zero_chandrupatla is available in a C version and a C++ version and a Fortran77 version and a Fortran90 version and a MATLAB version and an Octave version and a Python version.

### Related Data and Programs:

bisection_rc, an Octave 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, an Octave code which calls fsolve() which seeks the solution x of one or more nonlinear equations f(x)=0.

root_rc, an Octave 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, an Octave code which implements test problems for the solution of a single nonlinear equation in one variable.

zero, an Octave code which seeks a solution of a scalar nonlinear equation f(x) = 0, by Richard Brent.

zero_itp, an Octave 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.

zero_rc, an Octave code which seeks a solution of a scalar nonlinear equation f(x) = 0, using reverse communication (RC), by Richard Brent.

### Author:

Original QBASIC version by Tirupathi Chandrupatla; This version by John Burkardt.

### Reference:

1. Tirupathi Chandrupatla,
A new hybrid quadratic/bisection algorithm for finding the zero of a nonlinear function without using derivatives,