[GRASS-git] [OSGeo/grass] 98f11b: i.vi: fix PVI formula (#1985)

[Ondrej Pesek]

  Branch: refs/heads/main
  Home:   https://github.com/OSGeo/grass
  Commit: 98f11bf568c84868c35e343b76aa6ae5012ee61a
      https://github.com/OSGeo/grass/commit/98f11bf568c84868c35e343b76aa6ae5012ee61a
  Author: Ondrej Pesek <pesej.ondrek at gmail.com>
  Date:   2021-11-28 (Sun, 28 Nov 2021)

  Changed paths:
    M imagery/i.vi/pvi.c

  Log Message:
  -----------
  i.vi: fix PVI formula (#1985)

* Fix wrong mathematical formula in the PVI index computation in i.vi

* fix #1984