From octave-sources-request at bevo dot che dot wisc dot edu Mon Jan 27 14:06:57 2003
Subject: finance/effir.m
From: Stefan Burger <s dot burger at debitel dot net>
To: octave-sources at bevo dot che dot wisc dot edu
Date: Mon, 27 Jan 2003 06:56:02 -0600


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Calculate the effective interest rate, given the nominal one.=20
Best regards,=20

Stefan Burger
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## Copyright (C) 2003 Stefan Burger
##
## This file is part of Octave.
##
## Octave is free software; you can redistribute it and/or modify it
## under the terms of the GNU General Public License as published by the
## Free Software Foundation; either version 2, or (at your option) any
## later version.
##
## Octave is distributed in the hope that it will be useful, but WITHOUT
## ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
## FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
## for more details.
##
## You should have received a copy of the GNU General Public License
## along with Octave; see the file COPYING.  If not, write to the Free
## Software Foundation, 59 Temple Place, Suite 330, Boston, MA 02111 USA.

## -*- texinfo -*-
##  at deftypefn {Function File} {} effir (@var{inom}, @var{n})
## Return the effective annual interest rate to a given annual nominal interest rate
##  at var{inom}, that is compounded over @var{n} periods..
##  at end deftypefn
##  at seealso{nomir}

## Author: Stefan Burger <Stefan dot Burger at stud dot tu-muenchen dot de>
## Description: Effective rate of return.

function reff = effir (inom, n)

  if (nargin != 2)
    usage("effir (inom, n)");
  endif

  if (! (isscalar (n)))
    error ("effir: n must be a scalar");
  endif

  reff = (1+inom/n).^n-1;

endfunction

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