Note

This manual is for LibreCAD’s stable release version 2.2.0.

Calculator Operators and Functions

Typing cal at the command line will toggle the calculator mode on and off.

Hint

Trigonometric functions expect angles in radians, they are identifiable by the function parameter (a) in the table! (radians = degrees*pi/180)
This is not very comfortable for humans, but there is a simple solution to pass angles in degrees.
Append the affix d to the degree value; thus, sin(90d) is a valid expression and will return the sinus of 90°.

As the calculator accepts arithmetic expressions and constants, this term will work too: sin(90*pi/180)
The part 90*pi/180 will be internally calculated and results in 1.57079632679, which is 90° in radians.

And of course, arithmetic expressions can be used for other function parameters too, e.g. to convert imperial to metric values and vice versa.

Functions

Name

Function / Operation

Usage

+

addition

x+y

-

subtraction

x-y

*

multiplication

x*y

/

division

x/y

^

raise x to the power of y

x^y

sin

sine function

sin(a)

cos

cosine function

cos(a)

tan

tangens function

tan(a)

asin

arcus sine function

asin(a)

acos

arcus cosine function

acos(a)

atan

arcus tangens function

atan(a)

sinh

hyperbolic sine function

sinh(a)

cosh

hyperbolic cosine

cosh(a)

tanh

hyperbolic tangens function

tanh(a)

asinh

hyperbolic arcus sine function

asinh(a)

acosh

hyperbolic arcus tangens function

acosh(a)

atanh

hyperbolic arcur tangens function

atanh(a)

log2

logarithm to the base 2

log2(x)

log10

logarithm to the base 10

log10(x)

log

logarithm to base e (2.71828…)

log(x)

ln

logarithm to base e (2.71828…)

ln(x)

exp

e raised to the power of x

exp(x)

sqrt

square root of a value

sqrt(x)

sign

sign function -1 if x<0; 1 if x>0

sign(x)

rint

round to nearest integer

rint(x)

abs

absolute value, negatives become positive

abs(x)

min

min of all arguments

min(x, y, …n)

max

max of all arguments

max(x, y, …n)

sum

sum of all arguments

sum(x, y, …n)

avg

mean value of all arguments

avg(x, y, …n)

Constsants

Name

Alias

Constant

Value

_pi

pi

The number π

3.141592653589793238462643

_e

Euler’s number

2.718281828459045235360287

Hint

Behind the scenes LibreCAD uses the muParser library for the command line and many input boxes. So the above information describes basically the features of muParser, which are implemented in LibreCAD.

For advanced users or the courious ones, you can read more about muParser on the inventors website:

Reference: https://beltoforion.de/en/muparser/index.php#idStart

But, be aware, that LibreCAD probably does not use the latest version of muParser. Also, it is not fully implemented. The muParser library has much more capabillities than LibreCAD uses.