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Joined: 10/04/2019(UTC) Posts: 3 
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Hi, I'm new to SMath. It's a great software but I'm frustrated with an (maybe simple) error. I try to calculate a density wich follows a simple linear equation: The equation is: D = 0,0006x+1 x stands for the mass. Now I try to calculate the density with different masses:  How you see I can't solve the second equation with the unit "g". SMath shows "Unit don't match". I try different ways to insert units but it doesn't work in any direction. So, what can I do? Where is the failure? Thanks in advance for your help!
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Joined: 23/12/2011(UTC) Posts: 319   Location: italy Was thanked: 109 time(s) in 93 post(s)
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The formulation you wrote for the density calculation (linear equation) would suggest a dimensionless formulation (those typical equations contained in technical manuals or codes). Therefore it must be used in dimensionless form with the quantities inserted without a unit of measurement. With m2 you have instead used a unit of measurement that caused the error by not being able to add up a dimensionless quantity (1) with a quantity with unit of measure (g)
sergio
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Rank: Newbie
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Joined: 10/04/2019(UTC) Posts: 3
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Thank you for quick reply!
I will calculate it dimensionless.
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 Rank: Advanced Member Groups: Registered, Advanced Member Joined: 13/01/2012(UTC) Posts: 2,647 Location: Italy Was thanked: 1329 time(s) in 875 post(s)
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If you like my plugins consider to support SMath Studio buying a plan; to offer me a coffee: paypal.me/dcprojects |
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Joined: 04/07/2015(UTC) Posts: 6,866  Was thanked: 981 time(s) in 809 post(s)
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Originally Posted by: Rosti  So, what can I do? ... work Engineering/Scientific projects UnitlessMaths are unitless, so projects using maths. IMHO, the attached is a good example.  Inst_Colebrook Pipe Data.sm (60kb) downloaded 19 time(s).
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Rank: Newbie
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Joined: 10/04/2019(UTC) Posts: 3
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Thanks for all answers! 
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Rank: Guest
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Joined: 04/07/2015(UTC) Posts: 6,866 Was thanked: 981 time(s) in 809 post(s)
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Originally Posted by: Rosti Thanks for all answers! Knowing in what units the document is designed/produced, you can always append the unit in the result ... like this: you can't define kg/m³:=1 otherwise kg_m³:=1 This SS 6179 should work in your latest SS version. Cheers ... Jean  Inst_Type J Genfit Rational J_8.sm (97kb) downloaded 5 time(s).
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