uniquetol.m: Simplify code for "ByRows" option (bug #59850). Use standard form for error() messages and update input validation BIST tests to pass. * uniquetol.m: Use "real" instead of "non-complex" in documentation and in error() messages. Update input validation BIST tests to pass with new messages. Update documentation example so that text matches actual output of Octave. Use isreal() rather than iscomplex() in input validation. New variable "calc_indices" which indicates whether outputs ia, ic should be calculated. Use "calc_indices" to reduce running unnecessary code. In ByRows code, eliminate Iall variable and use J for the same purpose. Eliminate linear search ("any (Iall == i)") with direct lookup ("if (J(i))"). Eliminate variables sumeq, ii. Introduce intermediate variable "Arow_i" for clarity. Rename "equ" to "eq_rows" for clarity. Use '!' instead of '~' for logical negation.

To cite GNU Octave in publications use:

  John W. Eaton, David Bateman, Søren Hauberg, Rik Wehbring (2022).
  GNU Octave version 7.1.0 manual: a high-level interactive language for
  numerical computations.
  URL https://www.gnu.org/software/octave/doc/v7.1.0/

A BibTeX entry for LaTeX users is:

  @manual{,
    title     = {{GNU Octave} version 7.1.0 manual: a high-level interactive language for numerical computations},
    author    = {John W. Eaton and David Bateman and S{\o}ren Hauberg and Rik Wehbring},
    year      = {2022},
    url       = {https://www.gnu.org/software/octave/doc/v7.1.0/},
  }

We have invested a lot of time and effort in creating GNU Octave, please
cite it when using it.  See also 'citation pkgname' for citing Octave
packages.