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Re: Unit conversion of a list of quantities

  • To: mathgroup at smc.vnet.net
  • Subject: [mg131976] Re: Unit conversion of a list of quantities
  • From: mariusz sapinski <mariusz.sapinski at gmail.com>
  • Date: Fri, 8 Nov 2013 16:23:24 -0500 (EST)
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  • References: <20131107052837.122DC6A56@smc.vnet.net>

Hi Itai,

Many thanks for your suggestion. For a single quantity it works. It does
not do anything for a list of quantities (see screenshot).
Could it be that UnitConvert cannt take a list as an argument?

   Cheers,

         Mariusz


On Thu, Nov 7, 2013 at 6:39 AM, Itai Seggev <itais at wolfram.com> wrote:

> On Thu, Nov 07, 2013 at 12:28:37AM -0500, mariusz sapinski wrote:
> > I have the following lists:
> > Edep = {4.9491200000000017`*^-14 Joules,
> >   1.8669264000000004`*^-14 Joules, 6.223088000000001`*^-15 Joules}
> > mass = {0.043937500000000004` g, 0.06987` g, 0.02329` g}
> >
> > I want to calculate dose:
> > dose = Edep/mass
> >
> > I get another list (of Quantities):
> >
> > {(1.1264*10^-12 Joules)/g, (2.672*10^-13 Joules)/g, (
> >  2.672*10^-13 Joules)/g}
> >
> > OK, but I want to have Grays, ie. Joules/kg:
> >
> > UnitConvert[dose, "Joules/kg"]
> >
> > Unfortunately output is not what I want:
> > {UnitConvert[(1.1264*10^-12 Joules)/g, "Joules/kg"],
> >  UnitConvert[(2.672*10^-13 Joules)/g, "Joules/kg"],
> >  UnitConvert[(2.672*10^-13 Joules)/g, "Joules/kg"]}
> >
> >
> > How to get Mathematica to convert J/g to J/kg?
> > Mathematica 9.0.1 on linux.
> >
> > Regards, Mariusz
>
> Why not just convert to Grays?
>
> In[23]:= Quantity[5, "Joules"/"Grams"];
>
> In[24]:= UnitConvert[%, "Grays"]
> Out[24]= Quantity[5000, "Grays"]
>
> If you wish to convert to J/Kg, you must use correct syntax:
>
> In[25]:= UnitConvert[%, "Joules"/"Kilograms"]
> Out[25]= Quantity[5000, ("Joules")/("Kilograms")]
> --
> Itai Seggev
> Mathematica Algorithms R&D
> 217-398-0700
>



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