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is_real

Method of Operator.

is_real() -> bool​

Returns true if the operator has a real matrix representation. Conservative method: May return false for operators that are actually real. When true is returned, it is guaranteed to be correct.

Returns​

true if the operator is provably real, false otherwise (including cases where it may be real but cannot be verified).

Example​

var r1 = is_real(X(0))   // true (provably real)
var r2 = X(0).is_real()  // true
var r3 = is_real(Y(0))   // false (provably not real)
var r4 = is_real(-1i * operator_dense(1i*random([2,2],as_real), 0))  // false (conservative, even though result is real)