import re
def get_number(element):
re_number = re.match("(d+.?d*)", element)
if re_number:
return float(re_number.group(1))
else:
return 1.0
def getvalues(equation):
elements = re.findall("([a-z0-9.]+)", equation)
return [get_number(element) for element in elements]
eqn = []
eqn_no = int(raw_input("Enter the number of equations: "))
for i in range(eqn_no):
eqn.append(getvalues(str(raw_input("Enter Equation %d: " % (i+1)))))
print "Main Matrix: "
for i in range((eqn_no)):
for j in range((eqn_no+1)):
print " %f" %(eqn[i][j]),
print
print
equation=[]
equation=eqn
for k in range((eqn_no-1)):
for i in range((k+1),eqn_no):
for j in range((eqn_no+1)):
if(eqn[i][j]!=0):
eqn[i][j]=eqn[i][j]-(eqn[k][j]*(equation[i][k]/eqn[k][k]))
print "Matrix After %d step: " %(k+1)
for i in range(eqn_no):
for j in range((eqn_no+1)):
print " %f"%(eqn[i][j]),
equation[i][j]=eqn[i][j];
print
print
for input:
25x+5y+z=106.8
64x+8y+z=177.2
144x+12y+z=279.2
output is:
Main Matrix:
25.000000 5.000000 1.000000 106.800000
64.000000 8.000000 1.000000 177.200000
144.000000 12.000000 1.000000 279.200000
Matrix After 1 step:
25.000000 5.000000 1.000000 106.800000
0.000000 8.000000 1.000000 177.200000
0.000000 12.000000 1.000000 279.200000
Matrix After 2 step:
25.000000 5.000000 1.000000 106.800000
0.000000 8.000000 1.000000 177.200000
0.000000 0.000000 1.000000 279.200000
But it should be like
Main Matrix:
25.000000 5.000000 1.000000 106.800000
64.000000 8.000000 1.000000 177.200000
144.000000 12.000000 1.000000 279.200000
Matrix After 1 step:
25.000000 5.000000 1.000000 106.800000
0.000000 -4.80000 -1.56000 -96.208000
0.000000 -16.8000 -4.76000 -335.968000
Matrix After 2 step:
25.000000 5.000000 1.000000 106.800000
0.000000 -4.80000 -1.56000 -96.208000
0.000000 0.000000 0.699999 0.759981
First of all this is a partial code for solving root of n number of equations using Naive Guass elemination method. Does anyone have any idea why the hell on earth is this happening? Why the zero parts are changing and others aren't? I have done this code in c++ and it works there perfectly but here I'm facing many problem. Maybe I'm newbie to python. I'm using python 2.7.....
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