Preferred unit
A preferred unit is a display pin on one region. The stored quantity stays
the same; only the chip changes. The pin is saved on that region as
preferred_unit and survives Evaluate All.
Pin from the result chip
- Evaluate a math region so a result chip appears (trailing
=). - Click the unit on the chip — the underlined token after the number.
- Pick a compatible unit from the list. That unit is saved as this region’s preferred unit. The chip gains a pinned look.
Right-click the region and choose Reset units to clear the pin. The chip then follows the worksheet unit system again. If several regions are selected, Reset units clears every pin in the selection.
Lock it in the expression
Use
to(quantity, "unit")
when the target unit should be part of the calculation anyone can read:
R := w * L / 2 =
to(R, "lbf") =
Preferred unit is a display preference on one chip. to() is in
the math, so a printed PDF and a shared copy show the same conversion
without relying on a pin.
When the list is empty
Autocomplete must be on (Math Format → Autocomplete) for the compatible-unit list on the chip. The pin still works if you type a compatible unit after you click the chip. Incompatible tokens are rejected; the previous unit stays.