Mercurial > octave-nkf
changeset 3599:b8fa63b7ea79
[project @ 2000-02-23 22:48:08 by jwe]
| author | jwe |
|---|---|
| date | Wed, 23 Feb 2000 22:48:08 +0000 |
| parents | 0ae310231c46 |
| children | c11d138d654a |
| files | scripts/ChangeLog scripts/specfun/erfinv.m |
| diffstat | 2 files changed, 7 insertions(+), 3 deletions(-) [+] |
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--- a/scripts/ChangeLog Sat Feb 19 08:07:10 2000 +0000 +++ b/scripts/ChangeLog Wed Feb 23 22:48:08 2000 +0000 @@ -1,3 +1,7 @@ +2000-02-23 John W. Eaton <jwe@bevo.che.wisc.edu> + + * specfun/erfinv.m: Use z_new in convergence test, not z_old. + 2000-02-11 Georg Thimm <mgeorg@SGraphicsWS1.mpe.ntu.edu.sg> * set/create_set.m: Use find to avoid while loop.
--- a/scripts/specfun/erfinv.m Sat Feb 19 08:07:10 2000 +0000 +++ b/scripts/specfun/erfinv.m Wed Feb 23 22:48:08 2000 +0000 @@ -16,7 +16,7 @@ ## -*- texinfo -*- ## @deftypefn {Mapping Function} {} erfinv (@var{z}) -## Computes the inverse of the error function, +## Computes the inverse of the error function. ## @end deftypefn ## @seealso{erf and erfc} @@ -27,7 +27,7 @@ function [y, iterations] = erfinv (x) if (nargin != 1) - usage ("erfinv (x)"); + usage ("erfinv (x, maxit)"); endif maxit = 100; @@ -55,7 +55,7 @@ s = sqrt (pi) / 2; z_old = ones (length (i), 1); z_new = sqrt (-log (1 - abs (x(i)))) .* sign (x(i)); - while (any (abs (erf (z_old) - x(i)) > tol * abs (x(i)))) + while (any (abs (erf (z_new) - x(i)) > tol * abs (x(i)))) z_old = z_new; z_new = z_old - (erf (z_old) - x(i)) .* exp (z_old.^2) * s; if (++iterations > maxit)