On 18.10.2013 18:05, Oscar Benjamin wrote:
It means that the additional column is a linear combination of the existing columns. This means that your system of equations can contain a contradiction. Essentially you're trying to get the least squares solution to something like: 3*x + y = 1 1*x + 2*y = 4 1*x + 2*y = 5 # Contradicts the equation above Because of floating point error it isn't *exactly* a contradiction so you get silly values instead of an error. http://en.wikipedia.org/wiki/Rank_(linear_algebra)
I get it, due to the type of data this can be possible and I am sure that is the issue. Now I have to figure out how to solve it, but at least you have identified the problem for me.
Thank you very much for clear and prompt solution! Best -- https://mail.python.org/mailman/listinfo/python-list
