TSP (libtsp/VR) - VRfCheckSym

## VRfCheckSym

#### Routine

int VRfCheckSym (const float x[], int N)

#### Purpose

Determine if an array of floats is symmetric or anti-symmetric

#### Description

This procedure returns a value which indicates whether a given array of float values is symmetric, anti-symmetric or neither. A symmetric array has values which satisfy,

      x[i] = x[N-i-1], for i = 0, 1, ..., N-1.

An anti-symmetric array has values which satisfy,

      x[i] = -x[N-i-1], for i = 0, 1, ..., N-1.

An all-zero array will be declared to be symmetric.

#### Parameters

<- int VRfCheckSym
  integer value,

        +1, if x[i] =  x[N-i-1], for i = 0, 1, ..., N-1
        -1, if x[i] = -x[N-i-1], for i = 0, 1, ..., N-1
         0, otherwise

-> const float x[]
  Array of floats (N elements)
-> int N
  Number of elements in the input array

#### Author / revision

P. Kabal Copyright (C) 1995 / Revision 1.9 1995/02/09

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