About this app

basic calculator, scientific calculator and graphing calculator, it also allows you to DIY your own calculator.


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
You can call the function by simple input f(xxx), for example, if you define a function `f(x,x1) = x + x1`, and if you input `f(2,3)`, the result will be `5`.
Predefined functions

Logarithms and power

sqrt(x): square root; x^0.5
curt(x): cube root; x^(1/3)
log(x), ln(x): natural 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
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:
i*i
(1+i)^2
e^(i*pi)
Operators

+ - × ÷ basic arithmetic
^ power
! 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 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.
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

You can enter values in binary, octal or hexadecimal by prefixing them with 0b, 0o or 0x respectively, such as:
binary: 0b1010
octal: 0o17
hexa: 0x100
if you want to display the result in binary, octal, hexadecimal, click the menu `DEC` in the calculator.

New features

ug fix.

App Permissions

Allows applications to open network sockets.
Allows applications to access information about networks.
Allows using PowerManager WakeLocks to keep processor from sleeping or screen from dimming.