Thanks for the suggestions. I'm on a Mac using OS 10.6.8. I created the csv
file using Excel and saving as a csv file. Here's what happened when I
tried rU in place of r:
sage: cat "medalcomparison4.csv"
1,0,0,1,0sage: f = open("medalcomparison4.csv",'rU')
sage: entries = map(lambda x:x.strip('\n').split(','), f.readlines())
sage: entries
[['0', '0', '0', '0', '0'], ['1', '0', '0', '1', '0'], ['1', '1', '0', '1',
'1'], ['1', '0', '0', '0', '0'], ['1', '0', '0', '1', '0']]
sage: m = Matrix(entries)
---------------------------------------------------------------------------
TypeError Traceback (most recent call last)
/Users/matrngnew/<ipython console> in <module>()
/Applications/sage-4.7.2/local/lib/python2.6/site-packages/sage/matrix/constructor.pyc
in matrix(*args, **kwds)
584
585 if nrows > 0 and ncols > 0 and ring is None:
--> 586 entries, ring = prepare(entries)
587
588 elif isinstance(args[0], dict):
/Applications/sage-4.7.2/local/lib/python2.6/site-packages/sage/matrix/constructor.pyc
in prepare(w)
708 ring = rings.CDF
709 elif not rings.is_Ring(ring):
--> 710 raise TypeError, "unable to find a common ring for all
elements"
711 return entries, ring
712
TypeError: unable to find a common ring for all elements
2011/12/5 Lukáš Lánský <lu...@lansky.name>
> Hi, this is obviously a problem with the system-specific line-ending
> characters. What happens if you try to replace
> open("medalcomparison4.csv",'r') with open("medalcomparison4.csv","rU") ?
>
> Have a nice day.
> Lukáš Lánský.
>
> Dne 5.12.2011 16:19, Raymond N. Greenwell napsal(a):
>
> This is getting warmer, but something must be different about my csv file.
> It appears to me to contain the following:
> 0 0 0 0 0 1 0 0 1 0 1 1 0 1 1 1 0 0 0 0 1 0 0 1 0 Here's what Sage
> does:
> sage: cat "medalcomparison4.csv"
> 1,0,0,1,0sage: f = open("medalcomparison4.csv",'r')
> sage: entries = map(lambda x:x.strip('\n').split(','), f.readlines())
> sage: entries
> [['0', '0', '0', '0', '0\r1', '0', '0', '1', '0\r1', '1', '0', '1',
> '1\r1', '0', '0', '0', '0\r1', '0', '0', '1', '0']]
> sage: entries = map(lambda x:map(Integer,x), entries)
> sage: entries
> [[0, 0, 0, 0, 1, 0, 0, 1, 1, 1, 0, 1, 11, 0, 0, 0, 1, 0, 0, 1, 0]]
> sage: m = Matrix(entries)
> sage: m
> [ 0 0 0 0 1 0 0 1 1 1 0 1 11 0 0 0 1 0 0 1 0]
> sage: D = DiGraph(m)
> ---------------------------------------------------------------------------
> ValueError Traceback (most recent call last)
>
> /Users/matrngnew/<ipython console> in <module>()
>
>
> /Applications/sage-4.7.2/local/lib/python2.6/site-packages/sage/graphs/digraph.pyc
> in __init__(self, data, pos, loops, format, boundary, weighted,
> implementation, sparse, vertex_labels, **kwds)
> 552 multiedges = ( len(uniq(positions)) < total )
> 553 except AssertionError:
> --> 554 raise ValueError(msg)
> 555 num_verts = data.nrows()
> 556 elif format == 'DiGraph':
>
> ValueError: Non-symmetric or non-square matrix assumed to be an
> incidence matrix: There must be two nonzero entries (-1 & 1) per column.
>
> I will try fiddling with the csv file.
>
> On Sun, Dec 4, 2011 at 2:50 AM, Nathann Cohen <nathann.co...@gmail.com>wrote:
>
>> > I'm still stuck at creating my digraph from my csv file. My csv file is
>> essentially an adjacency matrix of 0's and 1's. I can import it, but I
>> can't convert it into an adjacency matrix that can then be created into a
>> digraph. Any more ideas? Thanks in advance for any help.
>>
>> What about this ?
>>
>> sage: cat "dg.csv"
>> 0, 1, 0, 1
>> 1, 1, 0, 1
>> 1, 0, 0, 1
>> 0, 0, 0, 1
>>
>> sage: f = open("dg.csv",'r')
>> sage: # Removing '\n' and splitting into cells
>> sage: entries = map(lambda x:x.strip('\n').split(','), f.readlines())
>> sage: entries
>> [['0', ' 1', ' 0', ' 1'], ['1', ' 1', ' 0', ' 1'], ['1', ' 0', ' 0', '
>> 1'], ['0', ' 0', ' 0', ' 1']]
>> sage: # Casting from str to integers
>> sage: entries = map(lambda x:map(Integer,x), entries)
>> sage: entries
>> sage: # A matrix
>> sage: m = Matrix(entries)
>> sage: m
>> [0 1 0 1]
>> [1 1 0 1]
>> [1 0 0 1]
>> [0 0 0 1]
>> sage: # A Digraph
>> sage: D = DiGraph(m)
>> sage: D.edges()
>> [(0, 1, None), (0, 3, None), (1, 0, None), (1, 1, None), (1, 3, None),
>> (2, 0, None), (2, 3, None), (3, 3, None)]
>>
>> Nathann
>>
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