Autodesk AUTOCAD 2006, Command Reference Manual, Page: 218 / 1490

getvar(viewctr)
With this method, you can also access the user system variables, USERI1-5
and USERR1-5. For example, to retrieve the value stored in USERR2, enter the
following:
getvar(userr2)
Convert Units of Measurement
The
cvunit
function converts either a number or a point from one unit of
measurement to another. See the acad.unt file for a list of units that you can
convert. The syntax is
cvunit ( value, from_unit, to_unit )
The following example converts the value 1 from inches to centimeters:
cvunit(1,inch,cm)
Use Standard Numeric Functions
CAL supports the standard numeric functions in the following table.
Numeric functions
Description Function
Sine of the angle sin(angle)
Cosine of the angle cos(angle)
Tangent of the angle tang(angle)
Arcsine of the number; the number must be between –1 and 1 asin(real)
Arccosine of the number; the number must be between –1 and 1 acos(real)
Arctangent of the number atan(real)
Natural log of the number ln(real)
Base-10 log of the number log(real)
Natural exponent of the number exp(real)
Base-10 exponent of the number exp10(real)
Square of the number sqr(real)
Square root of the number; the number must be nonnegative sqrt(real)
194 | Chapter 5