(self)
| 508 | # _check_branch_cut(ncu._arg, -1, 1j, -1, 1) |
| 509 | |
| 510 | def test_special_values(self): |
| 511 | # carg(-np.inf +- yi) returns +-pi for finite y > 0 |
| 512 | check_real_value(ncu._arg, -np.inf, 1, np.pi, False) |
| 513 | check_real_value(ncu._arg, -np.inf, -1, -np.pi, False) |
| 514 | |
| 515 | # carg(np.inf +- yi) returns +-0 for finite y > 0 |
| 516 | check_real_value(ncu._arg, np.inf, 1, np.PZERO, False) |
| 517 | check_real_value(ncu._arg, np.inf, -1, np.NZERO, False) |
| 518 | |
| 519 | # carg(x +- np.infi) returns +-pi/2 for finite x |
| 520 | check_real_value(ncu._arg, 1, np.inf, 0.5 * np.pi, False) |
| 521 | check_real_value(ncu._arg, 1, -np.inf, -0.5 * np.pi, False) |
| 522 | |
| 523 | # carg(-np.inf +- np.infi) returns +-3pi/4 |
| 524 | check_real_value(ncu._arg, -np.inf, np.inf, 0.75 * np.pi, False) |
| 525 | check_real_value(ncu._arg, -np.inf, -np.inf, -0.75 * np.pi, False) |
| 526 | |
| 527 | # carg(np.inf +- np.infi) returns +-pi/4 |
| 528 | check_real_value(ncu._arg, np.inf, np.inf, 0.25 * np.pi, False) |
| 529 | check_real_value(ncu._arg, np.inf, -np.inf, -0.25 * np.pi, False) |
| 530 | |
| 531 | # carg(x + yi) returns np.nan if x or y is nan |
| 532 | check_real_value(ncu._arg, np.nan, 0, np.nan, False) |
| 533 | check_real_value(ncu._arg, 0, np.nan, np.nan, False) |
| 534 | |
| 535 | check_real_value(ncu._arg, np.nan, np.inf, np.nan, False) |
| 536 | check_real_value(ncu._arg, np.inf, np.nan, np.nan, False) |
| 537 | |
| 538 | |
| 539 | def check_real_value(f, x1, y1, x, exact=True): |
nothing calls this directly
no test coverage detected