Qalculate! is a multi-purpose cross-platform desktop calculator. It is simple to use but provides power and versatility normally reserved for complicated math packages, as well as useful tools for everyday needs (such as currency conversion and percent calculation).Features include a large library of customizable functions, unit calculations and conversion, physical constants, symbolic calculations (including integrals and equations), arbitrary precision, uncertainty propagation, interval arithmetic, plotting, and a user-friendly interface.

Qalculate! (Qt UI)

Changes:<ul><li>Do not automatically by default set prefix higher than kilo for meter, gram, higher than 1 (no prefix) for second and litre, or lower than 1 for byte and bit</li><li>Do not use recently introduced SI prefixes (R, Q, r, q) automatically by default</li><li>Do not set automatic prefix if resulting multiplier is less than 1 or greater than 1000, with some exceptions (e.g. km)</li><li>Default prefix unit property (use for gram, and few other units, instead of hard coded value)</li><li>Option to change symbols used for output of digits 10 and 11 in duodecimal numbers (use A and B as default digits)</li><li>Allow the same variable left and right of the equals sign (e.g. var=var+2), in variable assignment without colon, if the variable exists and the previous value is known</li><li>Use Unicode symbol for minus in scientific e notation</li><li>Do not show multiplier if exactly 1, in HTML output of scientific notation</li><li>Prefer Nm (torque) over J when the result is a vector with three components</li><li>Add "amp" abbreviation to ampere unit, and "thou" name for 1/1000 in (mil)</li><li>Fix unit order for Nm and Ws</li><li>Fix conversion from ounce (interpreted as fluid ounce) to litre with prefix</li><li>Fix automatic reactivation of global object after deletion of conflicting object</li><li>Fix parsing of scientific e notation when the number is extremely large and exponentiation fails because of floating point overflow</li><li>Fixes for output of scientific notation using number bases other than decimal</li><li>Fix prefix selection in denominator when multiplier is higher than the value of the largest prefix</li><li>Fix segfault in multisolve()</li><li>Minor bug fixes and feature enhancements</li></ul>

Changes:<ul><li>Fix retrieval of exchange rates from mycurrency.net and add alternative secondary exchange rates sources</li><li>Align completion list to beginning of word, and do not reduce width of columns in visible list</li><li>Add option to not format output (size, style, sub-/superscript)</li><li>Add m/s³, m/s⁴, m/s⁵, and m/s⁶ as derived units (improves automatic unit conversion)</li><li>Check that the output of command, in command() function, is a reasonably sane expression</li></ul>

Changes:<ul><li>Use history font for RPN stack list</li><li>Use log() instead of log2() as alternative action on "ln" keypad button</li><li>Conversion to any type of expression (e.g. "1000 BTC to million USD")</li><li>Use current status of limit implicit multiplication setting during parsing of conversion expression</li><li>New SI prefixes (R, r, Q, q)</li><li>New units: ounce force (ozf), rack unit (U)</li><li>Use standard form (sorting) for polynomials</li><li>Improve consistency of behaviour when global units are replaced</li><li>More consistent addition of units to expression without units for unit conversion</li><li>Improvements and fixes for arg() and atan2() functions</li><li>Fix completion (including segfaults) and expression tooltip on Wayland</li><li>Fix RPN mode deactivated after application loses focus</li><li>Fix interpretation of Myr (megayear) and Gyr (gigayear)</li><li>Fix milli- and centimeter of water units</li><li>Fix genvector() with for negative step size or expression as step size/number of steps</li><li>Fix randuniform() function</li><li>Fix automatic/dual fraction format after conversion (e.g. "8 to score")</li><li>Fix inconsistently displayed parsing of "7d 5h" and similar</li><li>Minor bug fixes and feature enhancements</li></ul>

Changes:<ul><li>Add "Clear history" to available keyboard shortcut and button actions</li><li>Add option, in keypad button menu, to reset keypad position</li><li>Show exchange rates source, and update time, for current calculation in tooltip</li><li>New prime number functions: primePi(), primes(), nthprime(), nextprime(), prevprime(), and isprime()</li><li>New functions for intervals and uncertainties: upperEndpoint(), lowerEndpoint(), midpoint(), and errorPart()</li><li>Add meter of water and related pressure units, and more derived flow rate units</li><li>Support for vectors and matrices in uncertainty propagation calculation</li><li>Proper support for uncertainty propagation in total(), sum(), product(), and for() functions</li><li>Simplify display of parsed expression (primarily for quantities with units)</li><li>Avoid parsing of implicit multiplication as nested multiplication</li><li>Allow use of curly brackets as alternative parentheses</li><li>Include +/- statement in function argument without parentheses</li><li>Return values for approximate variables in exact mode in dimension() and elements()</li><li>Improve parsing of quotation marks as feet/inch or arcmin/arcsec (e.g. do not parse s" as sin)</li><li>Partial Georgian translation</li><li>Fix removal of additional keyboard shortcuts, after first removal</li><li>Fix font dialogs when "Keep above other windows" is enabled</li><li>Fix saving of sub-function precalculate property</li><li>Fix exact calculation of re((a*i)^(n/2)) (wrong sign in some cases)</li><li>Fix erroneous calculation in some cases with physical constants both outside and inside unit relations when interval calculation is set to interval arithmetic</li><li>Fix segfault in Calculator destructor</li><li>Fix segfaults in some corner cases</li><li>Fix use of random numbers in iterative functions</li><li>Fix writing beyond end of array during exchange rates check in some cases (results in activation of old style matrices)</li><li>Fix automatic reactivation of deactivated global object if a function with the same name exists</li><li>Do not convert function arguments which do not allow units (fixes "arcsin(0.5+/-0.1) to deg")</li><li>Fix prefix after conversion to optimal unit when the optimal unit includes a prefix</li><li>Fix exact calculation when function argument is an approximate vector variable (fail)</li><li>Minor bug fixes and feature enhancements</li></ul>

Changes:<ul><li>Fix handling of Unicode powers for units in denominator, with adaptive parsing enabled (e.g. parse 10m/s² the same as 10m/s^2)</li><li>Fix "+" ignored after "E" in number bases where "E" is a digit</li><li>Fix scientific E notation with sign in argument when function is used without parentheses</li><li>Fix lambertw() for values very close to zero</li><li>Fix a*b^x+cx=d when a and c have different signs and d is non-zero</li><li>Fix a^x+b^x=c when a and b is negative, and c is positive</li><li>Fix segfaults in some corner cases</li><li>Fix potential issues in handling of leap seconds (e.g. during subtraction of seconds from date)</li><li>Fix name field not working in argument edit dialog</li><li>var=a syntax for variable assignment with calculated expression</li><li>Replace ounce with fluid ounce during conversion to volume unit</li><li>Solve a^x+b^x+...=c in more cases</li><li>Improve remainder/modulus for numerators with large exponents</li><li>Truncate number in output of parsed expression and end with ellipsis if unable to display all decimals</li><li>Improved floating point calculation and output speed, particularly for simple expressions with very high precision</li><li>New functions: clip(), qFormat(), qError()</li><li>Replace selection (instead of wrap in parentheses) on operator input if selection ends with operator</li><li>Act as if two arguments are required when applying base-N logarithm to expression</li><li>Show padlock (or "[P]") after protected expression</li><li>Minor bug fixes and feature enhancements</li></ul>

Changes:<ul><li>Variable spacing of x values in plot (unless step size is used)</li><li>Option to plot real and imaginary parts separately (enabled by default)</li><li>Updated plot() function with arguments for specification of plot options (in any order after the third argument)</li><li>Polar plot style</li><li>Ask the user for the desired sinc() variant (unnormalized or normalized)</li><li>Support for binary-coded decimals (BCD)</li><li>Show names with underscore capitalized and with underscore removed (with some exceptions)</li><li>Additional information units</li><li>Units for volumetric flow rate</li><li>Tradtional numbers (e.g. dozen, score)</li><li>Show warning when log() is used with a single argument, and always show second argument of log()</li><li>Make names with a single character followed by digits case-sensitive with suffix by default</li><li>Accept more than two arguments in gcd() and lcm()</li><li>Interpret a single vector argument as a list of arguments if function requires more than one argument</li><li>Insert minus instead of executing RPN operation, on key press, when last character is e</li><li>Updated Tab key behaviour, e.g. cycle through completion items on subsequent tab key presses, and traverse items if tab key is unbound</li><li>Fix segfault when result is a currency with quantity of one</li><li>Fix copy keyboard shortcut in expression entry</li><li>Fix limit of floor(), ceil(), and trunc()</li><li>Fix plotting of derivatives and integrals</li><li>Fix randpoisson()</li><li>Fix reactivation of object, after object that caused deactivation is removed</li><li>Minor bug fixes and feature enhancements</li></ul>

Changes:<ul><li>Improve resolution and sizing of flag images</li><li>Do nothing when Enter is pressed if expression is empty</li><li>Restrict use of reciprocal in unit conversion, e.g. invert in "5m/s to s/m" (= 0.2 s/m) but not in "500/lb to g" (= 1.1/g)</li><li>New mHg unit (allows use with prefixes other than milli)</li><li>Always display abbreviated unit name (symbol) with abbreviated prefix (when unit only has short name)</li><li>Minor improvements to automatic unit conversion</li><li>Fix display of (1 + f(x))/n</li></ul>

Changes:<ul><li>Add option to show both parsed and entered (or only one) expression in history</li><li>Add option to clear expression history</li><li>Do not add duplicate results to history</li><li>Improved result copying, with proper html format and ASCII option</li><li>Do not replace *, -, / with Unicode operators if cursor is within quotation marks (apply same principles on paste)</li><li>Do not perform automatic (continuous) conversion, from conversion view, if result contains no unit</li><li>Use non-breaking narrow space as digit separator in reasonably short numbers, and between quantity and unit</li><li>Improve appearance of icons with display scaling</li><li>Update value of austronomical unit</li><li>Fix segfault with local digit grouping when separator is empty (e.g. with ignore locale)</li><li>Fix freezes and crashes with extrememly large vectors and matrices</li><li>Fix segfault in matrix multiplication</li><li>Minor bug fixes and feature improvements</li></ul>

Changes:<ul><li>Programming and algebra keypads</li><li>Customizable keypad</li><li>Customizable keyboard shortcuts</li><li>Option to hide number pad (right part of keypad)</li><li>Workspace (mode, history, and temporary variables) can now be saved (to a single file)</li><li>New matrix syntax (column separated by space or comma, rows separated by semicolon, as in matlab)</li><li>Do not make any difference between a vector and a matrix with a single row, or between a scalar and matrix with a single element</li><li>Support input of functions, units, and variables with underscores omitted in names (e.g. µ0 = µ_0, FermiCoupling = fermi_coupling), with some exceptions</li><li>Option to disable "simplified" percentage calculations (e.g. interpret 100 + 20% as 100 + 0.2 instead of 100 × 120%)</li><li>Option to truncate numbers (instead of round to nearest) in result</li><li>Convert K, Hz, and 1/m to J (and derived units) using conversion factor constants (e.g. 1/(550nm) to eV ≈ 2.25 eV)</li><li>Allow use of M as 10^6 without unit</li><li>New ksi unit</li><li>New functions: divisors(), rate(), vertcat(), horzcat()</li><li>New plastic number (ρ) constant, and new "hbar" name for reduced Planck constant, and add second Unicode codepoint for µ-sign in constants</li><li>Allow zero (1st and/or 2nd argument) in comb() and perm(), and return zero if second argument (k) is greater than the first (n)</li><li>Calculate statistical functions (e.g. mode(), min(), max(), percentile()) separately for each column of matrix</li><li>Return the lowest value if there are multiple values with equal frequency in mode()</li><li>Parse text argument as expression if concatenate function name is found in text string, and fix concatenate returning date</li><li>Fix Unicode handling on platforms where char is not signed</li><li>Fix bitrot()</li><li>Fix segfault in multisolve() when initial order of equations is not optimal</li><li>Fix segfault with empty sqrt inside sqrt, e.g. sqrt(1+sqrt())</li><li>Fix incompletely calculated nounit(), e.g. in unit conversion</li><li>Minor bug fixes and feature improvements</li></ul>

Changes:<ul><li>Unit and data set creation/editing</li><li>Complete variable and functions editing</li><li>Percentage calculation dialog</li><li>Periodic table</li><li>Show result in expression status tooltip (calculate-as-you-type)</li><li>Horizontal toolbar with added units and plot buttons</li><li>Favorite functions, units, and variables (shown in toolbar menus)</li><li>Ctrl+Enter shortcut for approximation of current result</li><li>New functions: linearfit(), quadraticfit(), cubicfit(), ramlatency(), parallel()</li><li>Improved and extended parallel operator (|| is interpreted as parallel if units are used)</li><li>Merged inv() and inverse() functions</li><li>Allow nested subfunctions</li><li>Solve x^(x^(-a))=b</li><li>Fix pearson() and spearman()</li><li>Fix a*sin(x)+b*cos(x)=c</li><li>Fix display of incompletely solved equation with dual approximation in some cases</li><li>Many minor feature enhancements and bug fixes</li></ul>

Changes:<ul><li>Show result index in history (click to insert value)</li><li>Remove paste icons from history</li><li>Double-click to insert history text</li><li>Add insert value and insert text to history context menu</li><li>Option to remove, protect, or move history item to top</li><li>History search</li><li>If there is no selection, copy the result/expression at cursor when using context menu</li><li>Options to use (middle) dot as multiplication sign and regular slash character as division sign</li><li>Move keypad button to last position in toolbar</li><li>Ask (once) for correct interpretation of ambiguous implicit multiplication</li><li>Improved simplification of radical expressions</li><li>Improved Im(), Re(), and arg() functions</li><li>Improved output of complex forms (other than the default rectangular) in exact mode</li><li>Immediately return memory on MR clicked if entire expression was unchanged (or empty)</li><li>Function for drill bit size conversion</li><li>Fix crash when using the dock menu to show the RPN dock stack for the first time</li><li>Fix link in new version dialog</li><li>Fix parenthesis highlighting when cursor is at end of expression</li><li>Fix initial value of interval display in preferences dialog</li><li>Fix saving of approximation mode</li><li>Fixes for equations with complex inverse trigonometric and hyperbolic functions with no solution</li><li>Fixes for complex x^(ax)=b</li><li>Fixes for localization on Windows</li><li>Minor bug fixes and feature improvements</li></ul>

Initial version of the Qt user interface.

Qalculate! is a multi-purpose cross-platform desktop calculator. It is simple to use but provides power and versatility normally reserved for complicated math packages, as well as useful tools for everyday needs (such as currency conversion and percent calculation).Features include a large library of customizable functions, unit calculations and conversion, physical constants, symbolic calculations (including integrals and equations), arbitrary precision, uncertainty propagation, interval arithmetic, plotting, and a user-friendly interface.

Qalculate! (Qt UI)

Powerful and easy to use calculator

Cambiamenti nella versione 4.6.0

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Qalculate! (GTK UI)

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