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I was wondering what a good way might be to get a decimal answer when using units. For example, say I try

#define units

ft = units.length.foot

m = units.length.meter

#add some lengths and output in ft

(3*ft + 4*m).convert(units.length.ft)

I get back

6143/381*foot

Now, suppose I'd rather see this represented as a decimal than a fraction (for homework, perhaps?). If I try

(3*ft + 4*m).convert(units.length.foot).n()

I get an error. This is occuring on Sage 4.8 for sure, and I'm pretty sure in Sage 5.0 as well.

Can anyone think of a good solution to this?

I was wondering what a good way might be to get a decimal answer when using units. For example, say I try

#define units
 
units
ft =  units.length.foot
 
units.length.foot
m = units.length.meter
 
units.length.meter
#add some lengths and output in ft
 
ft
(3*ft + 4*m).convert(units.length.ft)4*m).convert(units.length.ft)

6143/381*foot6143/381*foot

(3*ft + 4*m).convert(units.length.foot).n()4*m).convert(units.length.foot).n()