1 // Scilab ( http://www.scilab.org/ ) - This file is part of Scilab
2 // Copyright (C) INRIA - Farid BELAHCENE
4 // This file must be used under the terms of the CeCILL.
5 // This source file is licensed as described in the file COPYING, which
6 // you should have received as part of this distribution. The terms
7 // are also available at
8 // http://www.cecill.info/licences/Licence_CeCILL_V2-en.txt
10 function y=factorial(n)
12 // This function returns the factorial n. If n is a vector, matrix or hypermatrix it returns the element wise factorial
13 // Input : n, a scalar/vector/matrix/hypermat of positives integers.
14 // Output : y, a scalar/vector/matrix/hypermat
19 error(msprintf(gettext("%s: Wrong number of input argument(s): %d expected.\n"),"factorial",1));
22 if (type(n) <> 1 & (typeof(n)<>"hypermat" | type(n.entries)<>1)) | (~isempty(n) & (or((n-floor(n)<>0)) | or(n<0))) then
23 error(msprintf(gettext("%s: Wrong value for input argument #%d: Scalar/vector/matrix/hypermatrix of positive integers expected.\n"),"factorial",1));
29 ntemp=cumprod(1:max(n))
30 y=matrix(ntemp(n(:)),size(n))