[Tutor] when 1 is not equal to 1...??
Carla A. Ng
c-ng at northwestern.edu
Fri Jul 16 22:43:45 CEST 2004
I've put in an error catch in a program to alert me when the equations
I'm trying to solve have an error.
Basically, if the sum of contributions to something does not equal 1, it
should print out an error message (I don't plan on keeping this in my
code, since it's bulky and outputs a bunch of stuff to the screen, but I
wanted to make sure everything was working correctly). But I'm getting
an error message when it *does* equal 1.
Here's the code:
diet=resize(base, (max,1))
for i in range(max):
for j in range(max):
diet[i,0]+=web[i,j]
for i in range(max):
if diet[i,0]<1.0 and i+1 not in Basal:
print "wij for ", i+1, "has an error!"
print diet
Just to double-check that my check was working, I printed "diet" at the
end. Then when I run it, I get:
wij for 1 has an error!
wij for 2 has an error!
wij for 3 has an error!
wij for 4 has an error!
wij for 5 has an error!
wij for 6 has an error!
wij for 7 has an error!
wij for 12 has an error!
wij for 13 has an error!
wij for 14 has an error!
wij for 15 has an error!
wij for 21 has an error!
wij for 22 has an error!
wij for 27 has an error!
wij for 28 has an error!
wij for 43 has an error!
wij for 54 has an error!
wij for 57 has an error!
wij for 58 has an error!
wij for 61 has an error!
wij for 63 has an error!
wij for 79 has an error!
wij for 83 has an error!
[[ 1.]
[ 1.]
[ 1.]
[ 1.]
[ 1.]
[ 1.]
[ 1.]
[ 1.]
[ 1.]
[ 1.]
[ 0.]
[ 1.]
[ 1.]
[ 1.]
[ 1.]
[ 1.]
[ 1.]
[ 1.]
[ 1.]
[ 1.]
[ 1.]
[ 1.]
[ 1.]
[ 1.]
[ 1.]
[ 1.]
(I didn't print out the whole thing, just enough to show it's not working).
Obviously, since diet[0,0]=1, I should not get the error message:
wij for 1 has an error!
Any ideas out there? I thought it might be a float/integer problem, but
everything is in floats, so I'm stumped.
Thanks!
Carla A. Ng
===================================
Northwestern University
Department of Chemical and Biological Engineering
2145 North Sheridan Road
Evanston, IL 60208
Phone: (847)467-4980
Fax: (847)491-4011
===================================
"When one tugs at a single thing in nature, he finds it attached to the
rest of the world."
-- John Muir
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