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I am trying to plot a 3D plot with a formula containing units. When I put the formula explicitly it works:

Plot3D[Quantity[V, "Centimeters"/"Seconds"]^2/ Quantity[r, "Centimeters"], {V, Quantity[40, (("Centimeters")/("Seconds"))^2],Quantity[50, (("Centimeters")/("Seconds"))^2]}, {r, Quantity[50, "Centimeters"], Quantity[58, "Centimeters"]}]

but as a function, I get an empty box 

a[V_, r_] := Quantity[V, "Centimeters"/"Seconds"]^2/ Quantity[r, "Centimeters"];

Plot3D[a[V, r], {V, Quantity[40, (("Centimeters")/("Seconds"))^2], Quantity[50, (("Centimeters")/("Seconds"))^2]}, {r, Quantity[50, "Centimeters"], Quantity[58, "Centimeters"]}]

Can someone help what am i doing wrong?

user42211
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  • https://mathematica.stackexchange.com/questions/27680/units-plotting-and-empty-plots?rq=1 – user42211 Jun 05 '17 at 13:55
  • when continued searching in the forum, I saw that inserting Evaluate[a[V_, r_]] solved this problem Thanks a lot Doron https://mathematica.stackexchange.com/questions/27680/units-plotting-and-empty-plots?rq=1 – user42211 Jun 05 '17 at 13:14

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