  We proposed in this paper a new method, which we named the W4 method, to
solve nonlinear equation systems. It may be regarded as an extension of the
Newton-Raphson~(NR) method to be used when the method fails. Indeed our method
can be applied not only to ordinary problems with non-singular Jacobian
matrices but also to problems with singular Jacobians, which essentially all
previous methods that employ the inversion of the Jacobian matrix have failed
to solve. In this article, we demonstrate that (i) our new scheme can define a
non-singular iteration map even for those problems by utilizing the singular
value decomposition, (ii) a series of vectors in the new iteration map
converges to the right solution under a certain condition, (iii) the standard
two-dimensional problems in the literature that no single method proposed so
far has been able to solve completely are all solved by our new method.
