polydiv example incorrect

The example given here with the following polynomial:

3x^2 + 5x + 2 / (2x + 1)

Should have the following code to be consistent with numpy >1.4, as documented here:

x = np.array([2.0, 5.0, 3.0])
y = np.array([1.0, 2.0])
np.polydiv(x, y)
(array([1.75 , 1.5]), array([0.25]))

The first link above points to the documentation for the older polynomial module, whereas the second link points to the new polynomial package. The API between these two is not consistent - the polynomial package expects coefficient arrays in ascending order whereas the module has them in the opposite order. np.polydiv is a function from the polynomial module so is consistent with the older API.

This is indeed quite confusing, so suggestions on how to improve the situation are very welcome!

FWIW there is an attempt at summarizing the situation in the reference guide.

Well what I was thinking was we can simply take polynomial as input in polydiv, as in np.polynomial and then just simlply reverse the 1d array and then the rest of the polydiv function can be performed.

Navigation Menu

Repository navigation

polydiv example incorrect #18020

Metadata

Assignees

Labels

Type

Projects

Milestone

Relationships

Development

polydiv example incorrect #18020

Description

Activity

rossbar commented on Dec 18, 2020

rossbar commented on Dec 18, 2020

ayush1300 commented on Dec 21, 2020

Metadata

Metadata

Assignees

Labels

Type

Projects

Milestone

Relationships

Development

Issue actions