Helper function used to implement the `` sub`` functions.
(c1, c2)
| 583 | |
| 584 | |
| 585 | def _sub(c1, c2): |
| 586 | """ Helper function used to implement the ``<type>sub`` functions. """ |
| 587 | # c1, c2 are trimmed copies |
| 588 | [c1, c2] = as_series([c1, c2]) |
| 589 | if len(c1) > len(c2): |
| 590 | c1[:c2.size] -= c2 |
| 591 | ret = c1 |
| 592 | else: |
| 593 | c2 = -c2 |
| 594 | c2[:c1.size] += c1 |
| 595 | ret = c2 |
| 596 | return trimseq(ret) |
| 597 | |
| 598 | |
| 599 | def _fit(vander_f, x, y, deg, rcond=None, full=False, w=None): |