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31 lines
595 B
OCaml
31 lines
595 B
OCaml
(** Contains the conventions relative to the program.
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The phase convention is given by:
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{% $\sum_i c_i > 0$ %} or {% $\min_i c_i \ge 0$ %}
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*)
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open Vector
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let in_phase vec =
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let s = Vector.sum vec in
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if s = 0. then
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let rec first_non_zero k =
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if k > Vector.dim vec then
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k-1
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else if vec%.(k) = 0. then
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first_non_zero (k+1)
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else k
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in
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let k = first_non_zero 1 in
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vec%.(k) >= 0.
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else
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s > 0.
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let rephase mat =
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Matrix.to_col_vecs mat
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|> Array.map (fun v -> if in_phase v then v else Vector.neg v)
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|> Matrix.of_col_vecs
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