Change sympref with shortcut line of code

I want to change whether a symbolic equation outputs a decimal or fraction without having to type out/copy & paste the full line "sympref('FloatingPointOutput',false)"

It would be nice to have a line where I type "frac" or "dec" or some other shorthand to change this.

Here's a very quick example:

u = symunit

u = 
  symbolicUnitsCollection with units:

      ampere: [A]
      kelvin: [K]
    kilogram: [kg]
       meter: [m]
        mole: [mol]
      second: [s]
     candela: [cd]

  Show all units.

syms D_in D_out L k
sympref('FloatingPointOutput',false)

ans = logical
   0

Rcond = log((D_out/2)/(D_in/2))*(1/(2*pi*L*k))

Rcond = 

sympref('FloatingPointOutput',true)

ans = logical
   0

D_in = 11.75*u.in

D_in = 

Answer 1

[Steven Lord]

You could create a simple function to change the preference. You could even have that function retrieve the current value and set the preference to the other value (to toggle it.)

syms x
for k = 1:5
toggleFPO
queryFPO
y = expand((x*k).^(1/3))
end

FloatingPointOutput is  enabled.

y = 

FloatingPointOutput is disabled.

y = 

FloatingPointOutput is  enabled.

y = 

FloatingPointOutput is disabled.

y = 

FloatingPointOutput is  enabled.

y = 

function toggleFPO
sympref('FloatingPointOutput', ~sympref('FloatingPointOutput'));
end
function queryFPO
if sympref('FloatingPointOutput')
    fprintf('FloatingPointOutput is  enabled.\n')
else
    fprintf('FloatingPointOutput is disabled.\n')
end
end

[Evan Jones]

Perfect. Thanks!