Sample expressions
- simple expression: 1+2
- variable evaluation: pi
- function evaluation: sin(0)
- variable definition: a=3.5
- function definition: f(x)=x^2-1
- parentheses: (1-x)^2
To enter an expression containing letters, such as sin(x),
use the ⇳ key on the basic keypad.
It toggles opened/closed the letter keypad.
Predefined functions
Logarithms and power
- sqrt(x): square root; x^0.5
- cbrt(x): cube root; x^(1/3)
- exp(x): exponential; e^x
- log(x), ln(x): natural logarithm
- log2(x), lb(x): binary logarithm
- log10(x), lg(x): decimal logarithm
- log(base,x): arbitrary base logarithm
Trigonometric - radians
- sin(x), cos(x), tan(x)
- asin(x), acos(x), atan(x)
Trigonometric - degrees
- sind(x), cosd(x), tand(x)
- asind(x), acosd(x), atand(x)
Hyperbolic
- sinh(x), cosh(x), tanh(x)
- asinh(x), acosh(x), atanh(x)
Other
- gcd(x,y): greatest common divisor
- comb(n,k): combinations
- perm(n,k): permutations
- min(x,y), max(x,y)
- floor(x), ceil(x)
- abs(x): absolute value
- sign(x): signum 1 or -1
- rnd(): random value from [0,1]
- rnd(max): random value from [0, max]
- gamma(x): (x-1)!
- mod(x,y): modulo
Complex numbers
i or j is the complex base. Example:
Operators
- + - × ÷ basic arithmetic
- ^ power
- % percent
- ! factorial
- # modulo
- √ square root
- ' first derivative
Tips
- Parentheses: you may omit the leading or final parentheses, e.g. 1+2)(3+4 is valid.
- Multiplication: you may omit the multiplication operator when unambiguous, e.g. 3π+2(1+2)
- Expression continuation: starting a new expression with an operator (except -) auto-inserts ans,
the result of the last expression.
- Clear: use the Enter key to quickly erase the whole input line.
- Scientific e notation: 1e3 is 1000.
- Angles in degrees instead of radians: use either sind(90) or sin(90deg).
- Use trackball Up/Down to navigate the history.
- Delete single history item: long click on item.
Derivative
It is possible to compute the first derivative of a function with one argument
using the prime notation: log'(5).
The prime mark (quote) must appear immediately after the name of the function,
and must be followed by open-parentheses.
The derivative may be plotted e.g. sqrt'(x).
To compute the derivative of an expression you must define the expression as a named function:
E.g. f(x)=x^3+x^2+1, followed by f'(x).
Multi plot
To plot multiple functions on the same 2d graph, simply enter them on the same line separated by ";".
E.g. x;x^2;2
Binary, octal, hexadecimal
For different numeral systems use prefixes:
- binary: 0b, e.g. 0b1010
- octal: 0o, e.g. 0o17
- hexa: 0x, e.g. 0x100
Right now it is not possible to do the reverse operation, i.e. display a result in a non-decimal base.
About Arity Calc
Arity Calculator was written by Mihai Preda, and is open source.
It uses the "Arity" arithmetic library. Enjoy!