Main Menu:Measurements > Set Formulas Shortcut: Ctrl-F

Since
version 7.1 Mathematical Formulas can be applied to the measurements.
Formulas are applied after
the measurement is adjusted by the conversion factor, in case it is used.

Since
version 7.25 the maximum number length supported is (+/-)9.80...*10^(10^37),
306 valid decimal digits.

Formulas
are applied to the different values associated with measurements. Each
measurement tool produces a different set of values, if you measure an
angle, the formula will be applied to the angle, but if you use the Multiple
Segment Tool , the formula will be applied both to the length/perimeter and
to the area.

The formulas can include functions, as shown below:

sin(n)*cos(n)

n is the measurement value.

When a formula is applied to a measurement, both on the image
and in the Measurements Pane, the
measurement value will be preceded by the letter F, to indicate that the value is the
result of a formula applied to the measurement.

The
Measurements > Set Formulas menu opens the Formula
Editor, which has two tabs, Formulas,
and Options.

Formulas
Tab

One
formula can be applied to all kind of measurements, or different formulas
can be specified for each kind of measurement.

Select
All Measurements to use a single formula for all measurements,
or Only selected ones to apply different formulas to only specific
kind of measurements. When applying a formula to a specific kind of measurements,
select the corresponding checkbox.

If
None
is selected, no formula will be used at all.

The
Check
button will calculate the formula and show the result. When checking formulas
from this window, N will take 100 as its value.

The fn button
opens the Insert function window, where you can select functions, operators
or values will be used in the formula.

When
selecting a function, one or two text boxes will be enabled to enter the
values passed to the function.

To read
an explanation about values, functions and operators usage, select the
item and a short explanation will be displayed.

Some Formula Examples

N
+ 2

(1
+ 2) * N

pi*N

sin(N)

(1+2)*(2+3)-N

log(N;10)
There's a semicolon here (not a comma), we
use it in functions for separating parameters.

Options Tab

This
Tab defines how the formula result will look on screen and the precision
used for calculating it.

Precision

There are tree degrees of precision, Small, Medium and Big.
The left image shows the supported maximum number length for each one.

Rounding

If No rounding is selected the generated number will be very
long. To use shorter numbers set a rounding value to specify how many
numbers after the decimal point will be shown.

Convert to scientific notation
when the exponent is over

The numbers will be shown in scientific notation when the
exponent is over the indicated value.

Trigonometric functions

By default trigonometric functions use Radians, but they
can as well use Degrees or Grads.