#NEWLINE# @ Utils . timeIt #NEWLINE# def Jvec_approx( self , m , v , u = None ) : #NEWLINE# #INDENT# 'Jvec_approx(m, v, u=None)\n\n            Approximate effect 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: approxJv\n        ' #NEWLINE# return self . Jvec ( m , v , u )