numpy (matrix solver) - python vs. matlab

[someone]

On 04/30/2012 02:38 AM, Nasser M. Abbasi wrote:
> On 04/29/2012 05:17 PM, someone wrote:
>
>> I would also kindly ask about how to avoid this problem in
>> the future, I mean, this maybe means that I have to check the condition
>> number at all times before doing anything at all ? How to do that?
>>
>
> I hope you'll check the condition number all the time.

So how big can it (cond-number) be before I should do something else? 
And what to do then? Cramers rule or pseudoinverse or something else?

> You could be designing a building where people will live in it.
>
> If do not check the condition number, you'll end up with a building that
> will fall down when a small wind hits it and many people will die all
> because you did not bother to check the condition number when you solved
> the equations you used in your design.
>
> Also, as was said, do not use INV(A) directly to solve equations.

In Matlab I used x=A\b.

I used inv(A) in python. Should I use some kind of pseudo-inverse or 
what do you suggest?