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From: Keegan on 23 Jul 2010 18:43
Felipe, this is from:
http://home.online.no/~pjacklam/matlab/software/util/fullindex.html

function y = fixdec(x, n)
%FIXDEC Round towards zero with a specified number of decimals.
%
% Y = FIXDEC(X, N) rounds the elements of X to N decimals.
%
% For instance, fixdec(10*sqrt(2) + i*pi/10, 4) returns 14.1421 + 0.3141i
%
% See also: FIX, FLOOR, CEIL, ROUND, FIXDIG, ROUNDDEC, ROUNDDIG.

% Author: Peter J. Acklam
% Time-stamp: 2004-09-22 20:08:10 +0200
% E-mail: pjacklam(a)online.no
% URL: http://home.online.no/~pjacklam

% Check number of input arguments.
error(nargchk(2, 2, nargin));

% Quick exit if either argument is empty.
if isempty(x) || isempty(n)
y = [];
return
end

% Get size of input arguments.
size_x = size(x);
size_n = size(n);
scalar_x = all(size_x == 1); % True if x is a scalar.
scalar_n = all(size_n == 1); % True if n is a scalar.

% Check size of input arguments.
if ~scalar_x & ~scalar_n & ~isequal(size_x, size_n)
error(['When both arguments are non-scalars they must have' ...
' the same size']);
end

f = 10.^n;
y = fix(x .* f) ./ f;
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