Qalculate! is a multi-purpose desktop calculator for GNU/Linux. It is small and simple to use but with much power and versatility underneath. Features include customizable functions, units, arbitrary precision, plotting, and a user-friendly interface (KDE or GTK+).
Ключевые особенности и характеристики Qalculate!
· 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
