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function [u,s,x,y] = flt(x,y,ccv) ;
// This Software is ( Copyright INRIA . 1998 1 )
//
// INRIA holds all the ownership rights on the Software.
// The scientific community is asked to use the SOFTWARE
// in order to test and evaluate it.
//
// INRIA freely grants the right to use modify the Software,
// integrate it in another Software.
// Any use or reproduction of this Software to obtain profit or
// for commercial ends being subject to obtaining the prior express
// authorization of INRIA.
//
// INRIA authorizes any reproduction of this Software.
//
// - in limits defined in clauses 9 and 10 of the Berne
// agreement for the protection of literary and artistic works
// respectively specify in their paragraphs 2 and 3 authorizing
// only the reproduction and quoting of works on the condition
// that :
//
// - "this reproduction does not adversely affect the normal
// exploitation of the work or cause any unjustified prejudice
// to the legitimate interests of the author".
//
// - that the quotations given by way of illustration and/or
// tuition conform to the proper uses and that it mentions
// the source and name of the author if this name features
// in the source",
//
// - under the condition that this file is included with
// any reproduction.
//
// Any commercial use made without obtaining the prior express
// agreement of INRIA would therefore constitute a fraudulent
// imitation.
//
// The Software beeing currently developed, INRIA is assuming no
// liability, and should not be responsible, in any manner or any
// case, for any direct or indirect dammages sustained by the user.
//
// Any user of the software shall notify at INRIA any comments
// concerning the use of the Sofware (e-mail : FracLab@inria.fr)
//
// This file is part of FracLab, a Fractal Analysis Software
[x,I] = sortup(x) ;
y = y(I) ;
x0 = x ; y0 = y ;
if exists('ccv') == 0
ccv = 1 ;
end
y = (-2*ccv+1)*y ;
Pdiff = -1 ;
while ~and(Pdiff >= 0)
P = [] ; O = [] ;
Nx = length(x) ;
for i = 1:Nx-1
[slope,origin] = reglin([x(i+1) x(i)],[y(i+1) y(i)]) ;
P(i) = slope ;
O(i) = origin ;
end
Pdiff = mtlb_diff(P) ;
II = find(Pdiff >= 0) ;
if isempty(II)
new_idx = [1 Nx] ;
elseif ~isempty(II)
new_idx = [1 II+1 Nx] ;
end
// disp(new_idx)
x = x(new_idx) ; // disp(x)
y = y(new_idx) ;
end
y = (1 - 2*ccv)*y ;
u = (2*ccv - 1)*O ;
s = (1 - 2*ccv)*P ;
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