OK here's what I managed to type in the very unforgiving shell
sage: def nx(Tableau,pr,pc):
....: newtab=Tableau
....: nr=newtab.nrows()
....: nc=newtab.ncols()
....: if not pr in range(nr):
....: print('invalid pivot row in function nx')
....: return 'invalid pivot row in function nx'
....: if not pc in range(nc):
....: print('invalid pivot column in function nx')
....: return 'invalid pivot column in function nx'
....: pivot=newtab[pr,pc]
....: if pivot==0:
....: print('invalid pivot is 0')
....: return 'invalid pivot is 0'
....: else:
....: cellar=range(nc)
....: for j in range(nc):
....: if j==pc:
....: cellar(j)=0
....: else:
....: cellar(j)=-1*newtab[pr,j]/pivot
....: for i in range(nr):
....: for j in range(nc):
....: if i<>pr and j<>pc:
....: newtab[i,j]=newtab[i,j]+cellar(j)*newtab
[i,pc]
....: elif i==pr and j<>pc:
....: newtab[i,j]=cellar(j)
....: elif i<>pr and j==pc:
....: newtab[i,j]=newtab[i,j]/pivot
....: return newtab
....:
sage: save_session('TreeOfLife')
sage: nx(G,0,0)
---------------------------------------------------------------------------
TypeError Traceback (most recent call
last)
/home/stephen/Desktop/Sage/sage-4.1.1/<ipython console> in <module>()
/home/stephen/Desktop/Sage/sage-4.1.1/<ipython console> in nx(Tableau,
pr, pc)
/home/stephen/Desktop/Sage/sage-4.1.1/local/lib/python2.6/site-
packages/sage/symbolic/expression.so in
sage.symbolic.expression.Expression.function (sage/symbolic/
expression.cpp:15994)()
TypeError: Must construct a function with a tuple (or list) of
symbolic variables.
sage: G #this is the integer matrix I want to pass to the function
nx
[ 1 1 1 0 0 0 0 0 0 0 0 0 0]
[-1 0 -1 1 -1 0 1 1 1 1 1 1 0]
[ 0 -1 0 -1 1 0 -1 -1 -1 -1 -1 -1 0]
[ 0 0 -1 0 -1 1 1 1 1 1 0 0 0]
[ 0 0 0 0 0 -1 0 0 0 0 1 1 0]
[ 0 0 0 0 0 0 -1 -1 -1 -1 -1 -1 0]
[ 0 0 0 0 0 0 0 -1 -1 -1 0 -1 0]
[ 0 0 0 0 0 0 0 1 0 0 0 1 -1]
[ 0 0 0 0 0 0 0 -1 0 -1 0 -1 1]
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