# Ublas :

Subject: Re: [ublas] Solving simple vector equation *newbie*
From: Andrew Hill (andy.bob.hill_at_[hidden])
Date: 2012-02-29 14:24:33

Can you provide a more specific example? I know nothing about how to
use ublas. I'm looking for some simple code example. I don't have
any idea how to turn what petros said into code using ublas.

1) a, b, c are scalars
2) X, Y, Z are are 7-d column vectors
3) entries 3, 4, 5 of 7-d vectors have the most significance

Understanding how to do this, will really set me up for more
significant use of ublas going forward. I really appreciated any help
I can get.

Thanks!

On Wed, Feb 29, 2012 at 10:40 AM, petros <pmamales_at_[hidden]> wrote:
> this is equivalent to solving the system :
> [ X Y Z ] * ( a b c ) T
> for abc.
> if X,Y,Z have length higher than 3 you need to do leas squares
> (apply the regression formula)
> hth
> p-
>
> -----Original Message----- From: Andrew Hill Sent: Wednesday, February 29,
> 2012 11:18 AM To: ublas_at_[hidden] Subject: [ublas] Solving simple
> vector equation *newbie*
> I'm 100% new to ublas.  Can you help me get started?
>
> I need to solve for a, b, c in the vector equation:
>
> R = a*X + b*Y + c*Z
>
> where R, X, Y, Z are known column vectors.
>
> How do I do this in ublas?  Will you create or point me to a simple
> example of how to do this?  Details will really help me here as I
> haven't used ublas before, but I need it for several projects going
> forward.
>
> Thanks!
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> Sent to: andy.bob.hill_at_[hidden]