gistfile1.py

#!/usr/bin/env python
from fractions import *
import copy
import texttable
import pprint

HORIZONTAL = 1
VERTICAL = 2
BN = 1000000


M = [
        [ 0, 1, 1, 0, 0],
        [ 8,-2, 5, 1, 0],
        [30, 6, 1, 0, 1],
    ]
pi = 2
pj = 1
mode = HORIZONTAL

M = [
        [ Fraction(125, 16),  Fraction(5, 32),  Fraction(7, 32)],
        [ Fraction( 71, 16), -Fraction(1, 32),  Fraction(5, 32)],
        [ Fraction( 54, 16),  Fraction(3, 16),  Fraction(1, 16)],
        [                 0,                0,               -1],
        [                 0,               -1,                0],
        [-Fraction(  6, 16), -Fraction(3, 16), -Fraction(1, 16)],
    ]
pi = 5
pj = 1
mode = VERTICAL

M = [
        [ 0, -1, -1],
        [ 0, -1,  0],
        [ 0,  0, -1],
        [ 8, -2,  5],
        [30,  6,  1],
        [BN,  1,  1],
    ]
pi = 5
pj = 1

while True:
    T = copy.deepcopy(M)
    pretty = copy.deepcopy(T)
    for i in range(len(M)):
        for j in range(len(M[i])):
            if mode == HORIZONTAL and i == pi or mode == VERTICAL and j == pj:
                f = Fraction(M[i][j], M[pi][pj])
                if mode == VERTICAL:
                    f = -f
            else:
                f = M[i][j] - Fraction(M[pi][j]*M[i][pj], M[pi][pj])
            T[i][j] = f
            pretty[i][j] = ""
            if i == pi and j == pj:
                pretty[i][j] += "*"
            if f.denominator == 1:
                pretty[i][j] += "%d" % f.numerator
            else:
                pretty[i][j] += "%d/%d" % (f.numerator, f.denominator)

    tpp = texttable.Texttable()
    tpp.add_rows(pretty)
    print tpp.draw()

    M = T
    drop_row_ans = str(raw_input("Drop row? "))
    if drop_row_ans and drop_row_ans[0] == "y":
        M.pop()
    new_row_ans = str(raw_input("New row? "))
    if new_row_ans and new_row_ans[0] == "y":
        new_row = []
        for i in range(len(M[0])):
            num = int(input("Col %d Num: " % i))
            den = int(input("Col %d Den: " % i))
            new_row.append(Fraction(num, den))
        M.append(new_row)
    pi = int(input("New pi: "))
    pj = int(input("New pj: "))