[Tutor] An -1.#IND error

Mon Jan 28 04:29:55 CET 2008

```Luke:

This is literally the core of the code:

A = scipy.asmatrix(scipy.zeros((M, N), float))
q = scipy.asmatrix(scipy.zeros((N, 1)), float)
b = scipy.asmatrix(scipy.zeros((1, N)), float)

# populate A
# x is a vector of valid floats (I've checked)
# calculate b as:

b = A * x

After the matrix multiplication, the b vector elements are all "-1.#IND" 's.  Note that there are no divisions by zero in the program.

Cheers

Dinesh

----- Original Message -----
From: Luke Paireepinart
Cc: tutor at python.org
Sent: Saturday, January 26, 2008 11:12 PM
Subject: Re: [Tutor] An -1.#IND error

> After a matrix*vector multiplication (ie. b = Ax, with A, x and b all
> floats), the b vector elements are all "-1.#IND".  What does this
> mean?  Btw, they are no divisions in the program eg. no divide by zeros.
A code sample would be _much_ more helpful here.
Please include one that exhibits the problem.
>
> Dinesh
>
>
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