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c Scilab ( http://www.scilab.org/ ) - This file is part of Scilab
c Copyright (C) ????-2008 - INRIA
c
c This file must be used under the terms of the CeCILL.
c This source file is licensed as described in the file COPYING, which
c you should have received as part of this distribution. The terms
c are also available at
c http://www.cecill.info/licences/Licence_CeCILL_V2.1-en.txt
subroutine newest(type, uu, vv)
c compute new estimates of quadratic coefficients
c using the scalars computed in calcsc.
common /gloglo/ p, qp, k, qk, svk, sr, si, u,
* v, a, b, c, d, a1, a2, a3, a6, a7, e, f, g,
* h, szr, szi, lzr, lzi, eta, are, mre, n, nn
double precision p(101), qp(101), k(101),
* qk(101), svk(101), sr, si, u, v, a ,b,c, d,
* a1, a2, a3, a6, a7, e, f, g, h, szr, szi,
* lzr, lzi
real eta, are, mre
integer n, nn
double precision a4, a5, b1, b2, c1, c2, c3,
* c4, temp, uu, vv
integer type
c use formulas appropriate to setting of type.
if (type.eq.3) go to 30
if (type.eq.2) go to 10
a4 = a + u*b + h*f
a5 = c + (u+v*f)*d
go to 20
10 a4 = (a+g)*f + h
a5 = (f+u)*c + v*d
c evaluate new quadratic coefficients.
20 b1 = -k(n)/p(nn)
b2 = -(k(n-1)+b1*p(n))/p(nn)
c1 = v*b2*a1
c2 = b1*a7
c3 = b1*b1*a3
c4 = c1 - c2 - c3
temp = a5 + b1*a4 - c4
if (temp.eq.0.0d+0) go to 30
uu = u - (u*(c3+c2)+v*(b1*a1+b2*a7))/temp
vv = v*(1.+c4/temp)
return
c if type=3 the quadratic is zeroed
30 uu = 0.0d+0
vv = 0.0d+0
return
end
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