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Topic: Unit conversion of a list of quantities
Replies: 4   Last Post: Nov 8, 2013 4:05 PM

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Itai Seggev

Posts: 61
Registered: 7/29/13
Re: Unit conversion of a list of quantities
Posted: Nov 8, 2013 3:51 PM
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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

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