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function [s]=nancumsum(x,orient)
//
//This function returns in scalar or vector s the sum of the
//values (ignoring the NANs) of a vector or matrix (real or
//complex) x.
//
//This function for a vector or a matrix x, s=nancumsum(x)
//(or, equivalently s=nancumsum(x,'*') returns in scalar s
//the cumulative sum (ignoring the NANs) of all the entries
//of x taken columnwise.
//
//s=nancumsum(x,'r') (or, equivalently, s=nancumsum(x,1))
//returns in the cols(x) sized vector s the cumulative sum
//(ignoring the NANs) of the rows of x:
//s(:,i)=nancumsum(x(:,i))
//
//s=nancumsum(x,'c') (or, equivalently, s=nancumsum(x,2))
//returns in the rows(x) sized vector s the cumulative sum
//(ignoring NANs) of the columns of x:
//s(i,:)=nancumsum(x(i,:))
//
//For the last two cases, if a row or column is in whole
//composed of NAN, the corresponding place of s will contain
//a NAN.
//
//author: carlos klimann
//
//date: 2003-09-03
//
if argn(2)==1 then orient='*',end
isn=isnan(x)
x(isn)=0
s=cumsum(x,orient)
s(find(and(isn,orient)))=%nan
endfunction
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