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Re: Unit conversion of a list of quantities

  • To: mathgroup at smc.vnet.net
  • Subject: [mg131973] Re: Unit conversion of a list of quantities
  • From: Itai Seggev <itais at wolfram.com>
  • Date: Fri, 8 Nov 2013 16:22:24 -0500 (EST)
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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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