#NEWLINE# @ Utils . timeIt #NEWLINE# def Jtvec_approx( self , m , v , u = None ) : #NEWLINE# #INDENT# 'Jtvec_approx(m, v, u=None)\n\n            Approximate effect of transpose of J(m) on a vector v.\n\n            :param numpy.array m: model\n            :param numpy.array v: vector to multiply\n            :param numpy.array u: fields\n            :rtype: numpy.array\n            :return: JTv\n        ' #NEWLINE# return self . Jtvec ( m , v , u )