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Re: Multiple Constants

  • To: mathgroup at smc.vnet.net
  • Subject: [mg83262] Re: Multiple Constants
  • From: Steven Siew <siewsk at bp.com>
  • Date: Fri, 16 Nov 2007 05:32:40 -0500 (EST)
  • References: <fhh80l$946$1@smc.vnet.net>

The following sequence of mathematica script will set the variables to
have the attribute Constant. First we show that the variables b and c
are just normal variables. Then we set their attributes to Constant.
And lastly we show that their attributes has changed.

Steven Siew


Attributes[b]

Attributes[c]

listofconstants = {b, c, d, A, f, g, h, Q}

Map[SetAttributes[#, Constant] &, listofconstants]

Attributes[b]

Attributes[c]


On Nov 15, 9:45 pm, thehammers... at gmail.com wrote:
> Hi,
> I'm new to Mathematica and I feel like this is a stupid question but I
> can't seem to define more than one constant
>
> If I type
> SetAttributes[a,b,c,Contstant]
> I get
> SetAttributes::argrx: SetAttributes called with 4 arguments; 2
> arguments are \expected.
>
> I have three equations and three variables I want to solve for and I
> have 8 constants.
>
> x+y+z=1
> b*x+c*y+d*z=A
> f*x+g*y+h*z=Q
>
> b,c,d,A,f,g,h,Q are constants and I want a generic equations that I
> can use for many different variations of these constants.
>
> I've done the calculation by hand but fear I have made a mistake and
> would like to double check my calculation, and then use the equation
> to propagate my errors, as each constant has an associated standard
> error of the mean. Propagation of my error will give me an error on my
> model calculation, which is really important.
>
> Thanks



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