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.

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