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[Chunhe Lee <question157319@xxxxxxxxxxxxxxxxxxxxx>]

New question #157319 on DOLFIN:
https://answers.launchpad.net/dolfin/+question/157319

I installed fenics in my virtual Ubuntu system by:
sudo add-apt-repository ppa:fenics/ppa
sudo apt-get update
sudo apt-get install fenics

But when I run some code, there appear:

...........................
  Assembling matrix over cells [=====================================>] 98.1%
  Assembling matrix over cells [=====================================>] 99.8%
  Assembling matrix over cells [======================================] 100.0%
  Applying boundary conditions to linear system.
  Solving linear system of size 90601 x 90601 (PETSc LU solver, umfpack).
evaluate at wells,  [0.1417534770603531, 462.5727387490261]
Traceback (most recent call last):
  File "Lam_FirstPassage.py", line 200, in <module>
    print "evaluate at wells, ",i,u(i)
  File "/usr/lib/python2.7/dist-packages/dolfin/function/expression.py", line 339, in expression__call__
    self.eval(values, x)
RuntimeError: *** Error: DOLFIN has been compiled without CGAL, IntersectionOperatorImplementation is not available.

What should I do ? thanks!

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