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**Q**alculate! features
#### Math Library
- Calculation and parsing:
- Basic operations and operators: + - * / ^ E () && || ! < > >= <= != ~ & | << >>
- Fault-tolerant parsing of strings: log 5 / 2 .5 (3) + (2( 3 +5 = ln(5) / (2.5 * 3) + 2 * (3 + 5)
- Expressions may contain any combination of numbers, functions, units, variables, vectors and matrices
- Supports complex and infinite numbers
- Supports all number bases from 2 to 36, time format and roman numerals
- Ability to disable functions, variables, units or unknown variables for less confusion: ex. when you do not want (a+b)^2 to mean (are+barn)^2 but ("a"+"b")^2
- Controllable implicit multiplication
- Matrices and vectors, and related operations (determinants etc.)
- Verbose error messages
- Arbitrary precision
- RPN mode
- Result display:
- Supports all number bases from 2 to 36, plus sexagesimal numbers, time format and roman numerals
- Many customization options: precision, max/min decimals, multiplication sign, etc.
- Exact or approximate
- Fractions: 4 / 6 * 2 = 1.333... = 4/3 = 1 + 1/3
- Symbolic calculation:
- Ex. (x + y)^2 = x^2 + 2xy + y^2; 4 "apples" + 3 "oranges"
- Factorization and simplification
- Differentiation and integration
- Can solve most equations and inequalities
- Customizable assumptions give different results (ex. ln(2x) = ln(2) + ln(x) if x is assumed positive)
- Functions:
- All the usual functions: sine, log, etc... : ln 5 = 1.609; sqrt(tan(20) - 5) = sqrt(-2.76283905578)
- Lots of statistical, financial, geometrical, and more functions (approx. 200)
- If..then..else function, optional arguments and more features for flexible function creation
- Can easily be created, edit and saved to a standard XML file
- Units:
- Supports all SI units and prefixes (including binary), as well as imperial and other unit systems
- Automatic conversion: ft + yd + m = 2.2192 m
- Implicit conversion: 5m/s to mi/h = 11.18 miles/hour
- Smart conversion: can automatically convert 5 kg*m/s^2 to 5 newton
- Currency conversion with retrieval of daily exchange rates
- Different name forms: abbreviation, singular, plural (m, meter, meters)
- Can easily be created, edit and saved to a standard XML file
- Variables and constants:
- Basic constants: pi, e
- Lots of physical constants and elements
- CSV file import and export
- Can easily be created, edit and saved to a standard XML file
- Flexible, can contain simple numbers, units or whole expressions
- Data sets with objects and associated properties in database-like structure
- Plotting:
- Uses Gnuplot
- Can plot functions or data (matrices and vectors)
- Ability to save plot to PNG image, postscript, etc.
- Several customization options
- and more...
#### User Interface
- Graphical user interfaces implemented using KDE or GTK+-2.0 and Glade XML
- Flexible expression entry and separate result display
- Displays whether result is precise or not
- Small and ... not so small mode
- Practical menus give fast access to all advanced features
- Calculation history
- Optional traditional calculator buttons
- Dialogs for management of and easy access to functions, variables and units (with quick conversion)
- User friendly dialogs for functions, with description and entries for arguments
- Create/edit functions, variables and units
- Easy editing of matrices and vectors
- Easy interface to gnuplot
- Separate window for fast conversion between number bases
- Periodic table
- Small separate utilities for base, currency and unit conversion
- Additional text based interface with full functionality
- and more...
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