func matrixNaN(x *matrix.FloatMatrix) bool {
for i := 0; i < x.NumElements(); i++ {
if math.IsNaN(x.GetIndex(i)) {
return true
}
}
return false
}
/*
Returns x' * J * y, where J = [1, 0; 0, -I].
*/
func jdot(x, y *matrix.FloatMatrix, n, offsetx, offsety int) float64 {
if n <= 0 {
n = x.NumElements()
}
a := blas.DotFloat(x, y, &la_.IOpt{"n", n - 1}, &la_.IOpt{"offsetx", offsetx + 1},
&la_.IOpt{"offsety", offsety + 1})
return x.GetIndex(offsetx)*y.GetIndex(offsety) - a
}
/*
Returns sqrt(x' * J * x) where J = [1, 0; 0, -I], for a vector
x in a second order cone.
*/
func jnrm2(x *matrix.FloatMatrix, n, offset int) float64 {
/*DEBUGGED*/
if n <= 0 {
n = x.NumElements()
}
if offset < 0 {
offset = 0
}
a := blas.Nrm2Float(x, &la_.IOpt{"n", n - 1}, &la_.IOpt{"offset", offset + 1})
fst := x.GetIndex(offset)
return math.Sqrt(fst-a) * math.Sqrt(fst+a)
}
