remove random vector for rayleigh quotient

Author: MaxenceGollier

src/R2N.jl

@@ -48,8 +48,8 @@ function R2NSolver(
   s = similar(x0)
   s1 = similar(x0)
 
-  v0 = randn(T, length(x0))
-  v0 ./= norm(v0)
+  v0 = [(-1.0)^i for i in 0:(reg_nlp.model.meta.nvar-1)]
+  v0 ./= sqrt(reg_nlp.model.meta.nvar)
 
   has_bnds = any(l_bound .!= T(-Inf)) || any(u_bound .!= T(Inf))
   if has_bnds