distance.comoving: no visible global function definition for
  'integrate'
Undefined global functions or variables:
  integrate
Consider adding
  importFrom("stats", "integrate")
to your NAMESPACE file.
distance.comoving: no visible global function definition for
  ‘integrate’
Undefined global functions or variables:
  integrate
Consider adding
  importFrom("stats", "integrate")
to your NAMESPACE file.
distance.comoving: no visible global function definition for
  ‘integrate’
Undefined global functions or variables:
  integrate
Consider adding
  importFrom("stats", "integrate")
to your NAMESPACE file.
distance.comoving: no visible global function definition for
  ‘integrate’
Undefined global functions or variables:
  integrate
Consider adding
  importFrom("stats", "integrate")
to your NAMESPACE file.
distance.comoving: no visible global function definition for
  'integrate'
Undefined global functions or variables:
  integrate
Consider adding
  importFrom("stats", "integrate")
to your NAMESPACE file.
distance.comoving: no visible global function definition for
  ‘integrate’
Undefined global functions or variables:
  integrate
Consider adding
  importFrom("stats", "integrate")
to your NAMESPACE file.
distance.comoving: no visible global function definition for
  ‘integrate’
Undefined global functions or variables:
  integrate
Consider adding
  importFrom("stats", "integrate")
to your NAMESPACE file.
distance.comoving: no visible global function definition for
  ‘integrate’
Undefined global functions or variables:
  integrate
Consider adding
  importFrom("stats", "integrate")
to your NAMESPACE file.
distance.comoving: no visible global function definition for
  ‘integrate’
Undefined global functions or variables:
  integrate
Consider adding
  importFrom("stats", "integrate")
to your NAMESPACE file.
distance.comoving: no visible global function definition for
  'integrate'
Undefined global functions or variables:
  integrate
Consider adding
  importFrom("stats", "integrate")
to your NAMESPACE file.
distance.comoving: no visible global function definition for
  ‘integrate’
Undefined global functions or variables:
  integrate
Consider adding
  importFrom("stats", "integrate")
to your NAMESPACE file.
distance.comoving: no visible global function definition for
  ‘integrate’
Undefined global functions or variables:
  integrate
Consider adding
  importFrom("stats", "integrate")
to your NAMESPACE file.
distance.comoving: no visible global function definition for
  'integrate'
Undefined global functions or variables:
  integrate
Consider adding
  importFrom("stats", "integrate")
to your NAMESPACE file.