Computing generalized Inverse of a square but sparse matrix?

54 次查看（过去 30 天）
Sanwar Ahmad
Sanwar Ahmad 2020-12-16
回答： Christine Tobler 2021-1-8
I am trying to find the generalized inverse of a square and sparse matrix. I am using Matlab, however pinv(matrix) doesn't work for sparse matrices. If you have any suggestion or algorithm, please share. Thanks in advance.

请先登录，再回答此问题。

采纳的回答

Rishabh Mishra
Rishabh Mishra 2020-12-21
Hi,
The disadvantages of using ‘pinv’ to find inverse of sparse matrix are:
  1. ‘pinv’ requires costly SVD.
  2. ‘pinv’ does not work with sparse matrix.
Instead, you can use the function ‘pseudo-inverse’ for the same purpose. Refer the following link for documentation of ‘pseudo-inverse’ function.
Hope this helps!

更多回答（1 个）

Christine Tobler
Christine Tobler 2021-1-8
If you want to apply pinv(A)*b, you can instead use lsqminnorm(A, b), which also works for sparse matrices and does something equivalent (using QR decomposition instead of SVD).

类别

在 Help Center 和 File Exchange 中查找有关 Linear Algebra 的更多信息

标签

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by