qalculate-gtk

Qalculate! GTK+ UI

Qalculate! is a multi-purpose desktop calculator for GNU/Linux (and Mac OS). 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 (GTK+ and CLI).

##Installation In a terminal window in the top source code directory run

• ./autogen.sh (not required if using a release source tarball, only if using the git version)
• ./configure
• make
• make install

If libqalculate has been installed in the default /usr/local path you it might be necessary to specify the pkgconfig path when running configure: PKG_CONFIG_PATH=/usr/local/lib/pkgconfig ./configure

##Requirements

• GTK+ (>= 3.10)
• libqalculate 0.9.11

##Features Features specific to qalculate-gtk:

• Graphical user interface implemented using GTK+-3
• 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...

Features from libqalculate:

• 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)
  • 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...