I'm coming from writing Visual Basic code and am clueless about
python. I typed this into KWrite and saved it with .sage extension. I
used tab to indent and I am used to closing if then with an endif
statement, likewise I'm used to ending an for next statement with next
i etc.
def nx(Tableau,int pr,int pc):
newtab=Tableau
if not pr in range(newtab.nrows()):
print('invalid pivot row in function nx')
return 'invalid pivot row in function nx'
if not pc in range(newtab.ncols()):
print('invalid pivot column in function nx')
return 'invalid pivot column in function nx'
if newtab[pr,pc]==0:
print('invalid pivot is 0')
return 'invalid pivot is 0'
else:
pivot=newtab[pr,pc]
cellar=range(newtab.ncols())
for j in range(newtab.ncols()):
if j==pc:
cellar(j)=0 #had this set to null in VB
else:
cellar(j)=-1*newtab[pr,j]/pivot
for i in range(newtab.nrows()):
for j in range(newtab.ncols()):
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
I don't know if I'm using the logical operators and, or, not, etc
correctly. When I copy and paste this into the shell I also get a lot
of indentation errors. If I type at the prompt I suppose you un-indent
using the arrow keys since when I hit enter twice sage just executes
what I've typed so far.
I'd like to require the integer data type for vars pr and pc and I'd
like the matrix input called Tableau to be in QQ. I don't know how to
do this and I get errors from my attempted code. Also if I type the
function in the shell how do you open it again for further editing. A
lot of questions I know and I am reading the online tutorials but I
can't find the answers. Any help debugging would be great, thanks.
Steve
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