linalg:sign

(linalg:sign array)

Returns a fresh array of the same shape with the sign of every element as -1.0 / 0.0 / 1.0 (numpy's np.sign) -- equivalent to (linalg:emap #'signum array), but as a named function it is accelerated under --simd. It follows signum's own edges, which agree on every backend: a -0.0 element stays -0.0 and a NaN element stays NaN, since signum answers its argument unchanged for both.