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diff --git a/modules/statistics/macros/nansum.sci b/modules/statistics/macros/nansum.sci
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+// Scilab ( http://www.scilab.org/ ) - This file is part of Scilab
+// Copyright (C) 2001 - INRIA - Carlos Klimann
+// Copyright (C) 2013 - Scilab Enterprises - Adeline CARNIS
+//
+// This file must be used under the terms of the CeCILL.
+// This source file is licensed as described in the file COPYING, which
+// you should have received as part of this distribution.  The terms
+// are also available at
+// http://www.cecill.info/licences/Licence_CeCILL_V2.1-en.txt
+//
+
+function s=nansum(x,orient)
+    //
+    //This function returns in scalar or vector s the sum of the
+    //values (ignoring the NANs) of a vector or matrix x.
+    //
+    //For a vector or matrix  x, s=nansum(x) returns in scalar s
+    //the sum of all the entries (ignoring the NANs) of x.
+    //
+    //s=nansum(x,'r')(or,  equivalently,  s=nansum(x,1)) returns
+    //in each  entry of the  row vector s of  type 1xsize(x,'c')
+    //the sum of each column of x (ignoring the NANs).
+    //
+    //s=nansum(x,'c')(or,  equivalently,  s=nansum(x,2)) returns
+    //in each entry of the column vector s of type size(x,'c')x1
+    //the sum of each row of x (ignoring the NANs).
+    //
+    //
+    //fixed: 2003/09/03
+    //error texts and all NAN rows or columns
+    //
+    rhs = argn(2);
+    if rhs < 1 | rhs > 2 then
+        error(msprintf(gettext("%s: Wrong number of input argument(s): %d to %d expected.\n"),"nansum",1,2))
+    end
+
+    if or(type(x) == [10 15 16]) then
+        error(msprintf(gettext("%s: Wrong type for input argument #%d: Real or complex, boolean, polynomial matrix expected.\n"), "nansum", 1));
+    end
+
+    if isempty(x) | and(isnan(x)) then
+        s = 0;
+        return
+    end
+
+    if rhs == 1 then
+        orient = "*";
+    else
+        if and(type(orient) <> [1  10])  then
+            error(msprintf(gettext("%s: Wrong type for input argument #%d: A string or scalar expected.\n"), "nansum", 2));
+        end
+
+        if ~or(orient == ["r", "*", "c"] | orient == [1, 2]) then
+            error(msprintf(gettext("%s: Wrong value for input argument #%d: Must be in the set {%s}.\n"), "nansum", 2, """r"", ""c"", ""*"", 1, 2"));
+        end
+    end
+
+    isn=isnan(x)
+    x(isn)=0
+    s=sum(x,orient)
+endfunction