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+// Scilab ( http://www.scilab.org/ ) - This file is part of Scilab
+// Copyright (C) 2000 - INRIA - Carlos Klimann
+//
+// 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]=nanstdev(x,orient)
+    //
+    //This function    computes the standard  deviation of   the values of a
+    //vector or matrix x (ignoring the NANs).
+    //
+    //For a vector or a matrix x, y=nanstdev(x)  returns in the scalar y the
+    //standard deviation of all the entries of x (ignoring the NANs).
+    //
+    //y=nanstdev(x,'r')  (or,  equivalently, y=nanstdev(x,1)) is the rowwise
+    //standard deviation. It returns in each  entry of the  row vector y the
+    //standard deviation of each column of x (ignoring the NANs).
+    //
+    //y=nanstdev(x,'c')  (or,    equivalently,   y=nanstdev(x,2))    is  the
+    //columnwise standard deviation. It returns in  each entry of the column
+    //vector y the standard deviation of each row of x (ignoring the NANs).
+    //
+    //
+    //Fixings 2001-10-01. Communication from
+    //Collewet Guylaine <guylaine.collewet@cemagref.fr>
+    //
+
+    if argn(2)==0 then error(msprintf(gettext("%s: Wrong number of input argument: %d to %d expected.\n"),"nanstdev",1,2)), end
+
+    if x==[] then s=%nan, return, end
+
+    if argn(2)==1 then  orient="*",end
+    if orient=="r" then orient=1,elseif orient=="c" then orient=2,end
+
+    isn=isnan(x)
+    Mean=nanmean(x,orient);
+    if orient=="*" then
+        N=size(x,orient)-sum(bool2s(isn),orient)
+        x=x-Mean
+    else
+        N=size(x,orient)-sum(bool2s(isn),orient)
+        ind=list();for k=size(x),ind($+1)=:;end
+        ind(orient)=ones(size(x,orient),1)
+        x=x-Mean(ind(:))
+    end
+    x(isn)=0
+    allnans=find(N==0)
+    N(allnans)=1
+    s=sqrt(sum(x.*x,orient)./max(N-1,1));
+    s(allnans)=%nan
+endfunction