General Help
Input and Display of numbers and operations
Numbers and mathematical expressions containing numbers are for simplicity displayed
rounded to two digits after the period.
If you move the mouse pointer over the expressions, the exact expressions/number
the system computes with will be rendered as "tool tip" (a small window near the pointer).
If the expression is editable (by clicking on it with the mouse), the following functions and
operations may be used:
- The constants
pi
, e and i
.
- Arbitrary variables of no more than one letter, observe that the standard value of undefined variables is
0
by default.
- The binary operators
+ - * / ^
the last being the power operator, e.g. a^b
= ab.
- The trigonometric functions
sin,cos,tan, cot
and their inverse arcsin, arccos, arctan, arccot
.
Also sinh, cosh, tanh, coth
.
- Further special functions and operators:
exp, ln, abs
(absolute value, can also be used by enclosing |
)
, sqrt
(square root), cbrt
(cubic root) floor
(the greatest integer lower than
the argument), sign
(sign function: -1 for x<0, 1 otherwise), theta
(Heavyside-function: 0 for x<0,
1 otherwise).
- Operations for special number classes:
Re, Im, conj
for complex numbers, fac
(factorial,
can also be used by the postfix !
) for natural numbers.
- The usual rules for operator precedence apply:
^
precedes *
precedes +
.
Functions may be written with or without parentheses enclosing the argument, but for compound arguments (e.g.
sin(3*x)) parentheses are required.
Copyright © 2001-2006 MathletFactory
(www.mathletfactory.de)