Change sympref with shortcut line of code

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Evan Jones
Evan Jones on 21 Oct 2021
Commented: Evan Jones on 25 Oct 2021
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 = 

Accepted Answer

Steven Lord
Steven Lord on 21 Oct 2021
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

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R2021b

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