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Re: List of constants.

From: Muthiah Annamalai
Subject: Re: List of constants.
Date: Sat, 10 Feb 2007 15:42:08 -0600

On Sat, 2007-02-10 at 15:45 -0500, Paul Kienzle wrote:
> On Feb 9, 2007, at 6:56 AM, Muthiah Annamalai wrote:
> > Hello there,
> >
> > I was looking for some physical constant (Boltzmann Constant K),
> >  lately, and thought if we had some inbuilt thing in Octave
> > scripts-functions that return the value of constants.
> You don't want to add a new function for every constant.

> How about having a function which can return the desired
> constant, or perhaps return a static structure containing
> all constants.
I think I have implemented something on the lines of what JWE, and David
said earlier today. It works like this:

1. physical_constant()
   -returns the whole table as a structure.

2. physical_constant('speed_of_light')
   -returns just the number.

3. [val,unit,uncert]=physical_constant('speed_of_light')
   -returns other attributes.

It is a single pt entry to the constant list.

> Also, you might want to return a vector of exponents on
> the seven basic SI units rather than a string.  With it you
> can do things such as scale between cgs and mks.
> - Paul
I think this can go into a units conversion package, when we have one,
for the moment, I'd like to keep it independent. 

~ Muthiah

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