Kalker

Scientific calculator with math syntax that supports user-defined variables and functions, complex numbers, and estimation of derivatives and integrals
Features
Operators: +, -, *, /, !, %
Groups: (), [], ⌈ceil⌉, ⌊floor⌋
Vectors: (x, y, z, ...)
Matrices: [x, y, z; a, b, c; ...]
Pre-defined functions and constants
User-defined functions and variables
Root finding using Newton's method (eg. x^2 = 64). Note: estimation and limited to one root
Derivation (prime notation) and integration (eg. integral(a, b, x dx)
The value of an integral is estimated using Simpson's 3/8 rule,
while derivatives are estimated using the symmetric difference quotinent (and derivatives of higher order can be a bit inaccurate as of now)
Complex numbers
Understands fairly ambiguous syntax (eg. 2sinx + 2xy)
Syntax highlighting
Piecewise functions: , pressing enter before typing the final "}" will make a new line without submitting. Semicolons are only needed when writing everything on the same linef