I'm answering to myself on the mailing list just in case it might help some
in the future.
As, someone pointed out the error is in the assignment operator:
I wrote in the code:
sum1 =+ (i-mx)*(j-my)
which does not add the values but puts them.
Instead I should have wrote
sum1 += (i-mx)*(j-my)
a little difference that does a lot... :-)
here is the correct function:
def slope(x,y):
sum1 = 0
sum2 = 0
mx = mean(x)
my = mean(y)
for i,j in zip(x,y):
sum1 += (i-mx)*(j-my)
print sum1
sum2 += (i-mx)**2
slope = sum1/sum2
return slope
--
.''`.
: :' : We are debian.org. Lower your prices,
`. `' surrender your code.
`- We will add your hardware and software
distinctiveness to our own.
Resistance is futile.
----
Imagine there's no countries
It isn't hard to do
Nothing to kill or die for
And no religion too
Imagine all the people
Living life in peace
----
You all must read 'The God Delusion'
http://en.wikipedia.org/wiki/The_God_Delusion
---
when one person suffers from a delusion it is called insanity. When many
people suffer from a delusion it is called religion."
Robert Pirsig, Zen and the Art of Motorcycle Maintenance
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