Re: valarray

Hi Maxim,

In the current html documentation non-member functions are unfortunately not
listed yet , so you have to look at the header files directly . You will find
what you need in:

AddElemMult, AddElemDiv, ElementMult and ElementDiv .

Have also a look at the the Use function which allows you to assign an array to
a TVector without copying .

Eddy

• Maxim Nikulin <nikulin_at_gorodok.net> wrote:

> Dear Tomasz,
>
> You wrote:
> >
> > Have a look at TVectorD if you meant multiplication of numbers.
>
> I've done it already. Unfortunately I can't find an appropriate
> function
> or an operator.
>
> Double_t operator* (const TVectorD &source1,const TVectorD
> &source2);
>
> and other operators are suitable for linear algebra operations but
> not
> in my case. There are some methods similar to std::valarray operators
>
> void TVectorD::AddSomeConstant(Double_t val, const TVectorD& select);
> TVectorD& TVectorD::Sqr();
> TVectorD& TVectorD::Sqrt();
> TVectorD& TVectorD::Invert(); // can be used instead of operator/()
>
> However I don't see per element multiplication. Could you point me to
>
> the method producing the vector c as shown below
>
> TVectorD a,b;
> TVectorD c(a.GetNrows());
> for (UInt_t i = 0; i < c.GetNrows(); ++i) {
> c[i] = a[i]*b[i];
> }
>
> I'm really sorry if I missed it in the reference.
>
> --
> Yours faithfully,
> Maxim Nikulin
>
> > Maxim Nikulin wrote:
> >
> >> Hi,
> >>
> >> Is there a native ROOT class similar to STL std::valarray
> template?
> >> I'm interested in e.g. element to element multiplication operator
> >> (c = a*b means c[i] = a[i]*b[i]). Actually I prefer STL classes
> but in
> >> general ROOT behaves better with native classes.
> >>
> >> I found no valarray CINT library, although the headers are
> present.
> >> I've managed to build a dictionary with subset of valarray
> functions
> >> and operators but it's better to have the library "out of box". I
> >> can't say that writing correct LinkDef.h file was trivial problem
> and
> >> it's seems that generating dictionary for operators is missed in
> the
> >> ROOT Users Guide.
> >>
> >> I'm using ROOT-5.05/01, 2005-10-12 CVS HEAD, Fedora Core 2 Linux
> on
> >> Pentium IV PC. Of course I made cintdlls during ROOT installation.
> >>
>
>
Received on Thu Oct 27 2005 - 17:06:17 MEST