forum.polymake.org

Posted: **13 May 2012, 17:05**

Hi there,

I'm having difficulties reading in a list of polytopes from files that have been written by Maple/convex.
E.g. trying in polymake

Code: Select all

$B = load("<path>/p1.poly");

results in the error

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 ...'ake:  ERROR: "<path>/p1.poly", line 3: error reading property 'AMBIENT_DIM': invalid Int value starting at '
 ...'<path>/p1.poly", line 6: error reading property 'DIM': invalid Int value starting at '
 ...'<path>/p1.poly", line 9: error reading property 'N_VERTICES': invalid Int value starting at '

the file 'p1.poly' looks as follows:

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AMBIENT_DIM
6

DIM
6

N_VERTICES
32

N_FACETS
10

VERTICES
 2 4 0 -4 -5 1 3
 2 0 0 0 -1 1 -1
 2 4 0 -4 -9 1 3
 2 0 0 0 -9 1 -1
 2 0 0 -4 -9 1 3
 2 0 4 -4 -9 1 3
 2 4 0 -4 -9 5 -1
 2 0 0 0 -9 9 -9
 2 0 0 -4 -9 9 -5
 2 0 4 -4 -9 9 -5
 2 4 0 -4 -5 1 -11
 2 0 0 0 -1 1 -11
 2 0 0 -4 -1 1 -11
 2 0 4 -4 -1 1 -11
 2 4 0 -4 -9 1 -11
 2 0 0 0 -9 1 -11
 2 0 0 -4 -9 1 -11
 2 0 4 -4 -9 1 -11
 2 4 0 -4 -9 5 -11
 2 0 0 0 -9 9 -11
 2 0 0 -4 -9 9 -11
 2 0 4 -4 -9 9 -11
 2 2 0 -4 -3 1 3
 2 0 0 -2 -1 1 1
 2 0 0 -4 -3 1 3
 1 0 0 -2 -1 1 1
 2 0 0 -4 -1 1 1
 2 3 1 -4 -4 1 3
 2 0 1 -1 -1 1 0
 2 0 4 -4 -7 1 3
 1 0 2 -2 -2 2 0
 2 0 4 -4 -1 1 -3

FACETS
 0 1 0 0 0 0 0
 2 0 0 1 0 0 0
 0 -1 -1 -1 0 0 0
 0 -1 0 0 -1 -1 0
 0 0 1 0 0 0 0
 -1 0 0 0 0 2 0
 0 0 0 -1 0 -1 -1
 9 0 0 0 2 0 0
 11 0 0 0 0 0 2
 0 0 -1 0 -1 0 -1

AFFINE_HULL

VERTICES_IN_FACETS
{ 1 3 4 5 7 8 9 11 12 13 15 16 17 19 20 21 23 24 25 26 28 29 30 31 }
{ 0 2 4 5 6 8 9 10 12 13 14 16 17 18 20 21 22 24 25 26 27 29 30 31 }
{ 0 1 2 3 5 6 7 9 10 11 13 14 15 17 18 19 21 27 28 29 30 31 }
{ 0 1 6 7 8 9 10 11 12 13 18 19 20 21 22 23 25 26 27 28 30 31 }
{ 0 1 2 3 4 6 7 8 10 11 12 14 15 16 18 19 20 22 23 24 25 26 }
{ 0 1 2 3 4 5 10 11 12 13 14 15 16 17 22 23 24 26 27 28 29 31 }
{ 0 1 2 3 4 5 6 7 8 9 22 23 24 25 27 28 29 30 }
{ 2 3 4 5 6 7 8 9 14 15 16 17 18 19 20 21 }
{ 10 11 12 13 14 15 16 17 18 19 20 21 }
{ 22 23 24 25 26 27 28 29 30 31 }

FAR_FACE
{ }

with other files, this worked: e.g.

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AMBIENT_DIM
3

DIM
3

N_VERTICES
4

N_FACETS
4

VERTICES
  2 1 0 0
  2 0 1 0
  2 0 0 1
  4 1 1 1

FACETS
  1 0 -2 -2
  1 -2 0 -2
  1 -2 -2 0
  -1 2 2 2

AFFINE_HULL

VERTICES_IN_FACETS
{ 1 2 3 }
{ 0 2 3 }
{ 0 1 3 }
{ 0 1 2 }

FAR_FACE
{ }

Is just some version-conflict or old format?

Regards

Posted: **13 May 2012, 23:15**

Sorry, I could not reproduce the error. Both files look the same (up to concrete numeric values, naturally). Maybe you've got some invisible control character into the "bad" one, which disappeared in the posted copy?

Posted: **14 May 2012, 10:14**

mhh, I don't think so: I rewrote the first lines of the file with emacs by hand and still the same error.

Posted: **14 May 2012, 12:31**

Please create a trac ticket and upload your "ill" file as an attachment to it. Hopefully it will arrive unchanged. I'm still puzzled about the non-perceivable difference between your data files.

Posted: **14 May 2012, 16:00**

Have you produced the first file on a windows computer? I have seen such an error message with files that have a DOS type CR/LF. The difference is invisible in most text editors (e.g. emacs) even on other OS. Emacs might show you in the modline.

Does the error persist if you create a new file with some of the properties (typed, not copied...) on a linux computer?

Posted: **14 May 2012, 23:49**

argh! You were right: there really was s.th. wrong with the file (although I don't know why): when I re-pasted the data entered in this post in a new file, everything worked.

Thanks for the help and sry to waste your time.

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