module.exports = frob

/**
 * Returns Frobenius norm of a mat3
 *
 * @alias mat3.frob
 * @param {mat3} a the matrix to calculate Frobenius norm of
 * @returns {Number} Frobenius norm
 */
function frob(a) {
  return Math.sqrt(
      a[0]*a[0]
    + a[1]*a[1]
    + a[2]*a[2]
    + a[3]*a[3]
    + a[4]*a[4]
    + a[5]*a[5]
    + a[6]*a[6]
    + a[7]*a[7]
    + a[8]*a[8]
  )
}