[R-sig-Geo] gdistance resistanceDistance error

[ignacio.quintero]

Dear all,

I have came across the same error using resistanceDistance (and not
costDistance with same data):

  "#Get matrix of resistance distances. 
  Error in Cholesky(Lr) : CHOLMOD factorization was unsuccessful 
  In addition: Warning message: 
  In Cholesky(Lr) : 
    Cholmod warning 'not positive definite' at 
  file:../Cholesky/t_cholmod_rowfac.c, line 432"

I was using also a very large raster grid (~5000000 cells). This seems to be
the problem (do not know if because of memory): I cropped the same big
raster into a smaller one containing the locality points (and, of course, a
big frame outside; however, currently, I do not know if the frame extent
will change the results...) and it worked perfectly.

Hope this helps (although I would like to know the exact problem (memory or
other issue) with the resistanceDistance function)

Best,

Ignacio

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