Qalculate! (Qt UI)

Changes:

• Add temporary check box to function edit dialog
• Insert decimal separator (regardless of reported key symbol) when separator key is pressed on keyboard number pad
• Customizable number bases font
• Use slightly larger font size and wider letter spacing for binary digits, by default, and add option to use bold font for binary "1"
• Show tooltip with index and decimal value of bit when mouse is over binary digit in number bases view
• Preserve base of current expression when switching input number base using keypad buttons
• New function: ymd() (returns the number of calendar years, months, and days between two dates)
• Return exact value for more argument values in lambertw() function
• Integrate sqrt(ax + b)/x and 1/(x × sqrt(ax² + bx + c))
• Do not use same "n" variable for different unknown integer values in equation result (e.g. e^e^x = 1)
• Solve e^x = ln(x), a × sin(x) = a × tan(x), and a × sin(x) = −a × tan(x)
• Solve f(x) = f(x²) and f(x) = −f(x²) for trigonometric functions, and exponentiation
• Do not return x = −infinity as solution for a^x = 0
• Fix a = 1 and b = 1 solution for a^x = b when the value of a and b are unknown
• Fix uncertainty propagation with duplicate equal data set functions
• Fix division by zero warning for some expressions with zero quantity (e.g. "1 m × 0 kg")
• Fix trigonometric functions with function in argument not calculated when angle unit is not radians
• Fix result containing interval with zero as lower value not displayed automatically
• Fix inconsistent (over)use of secondary exchanges rate sources
• Fix number of decimals for currency quantity when currency is placed before quantity
• Minor bug fixes and feature enhancements

Changes:

• LaTeX input and output (using latex() function or "$\...$" syntax)
• Solve a*x^b+c*d^x=0 for real x
• Solve equations with absolute value and complex x (x*abs(x)=a, x^2*abs(x)=a, and a*f(x)+b*abs(x)=c)
• Improve simplification of a^(c/d)/b^(c/d) in exact mode (e.g. cbrt(12)/cbrt(4)=cbrt(3))
• Apply logical and bitwise operation entrywise to vectors and matrices
• Allow symbols with suffix when input using backslash (e.g. \x_n = "x_n", with n shown as subscript in output)
• Add argument for reverse conversion to roman(), bijective(), and bcd() functions
• Add tsp and tbsp abbreviations, change cup to exactly 240 mL (U.S. legal), and add U.S. customary cup, tablespoon, and teaspoon
• Mixed units conversion improvements/fixes
• Add "Insert parentheses" shortcut action (default "Ctrl+Shft+("), which always inserts empty parentheses after cursor
• Fix conversion of feet and inches when using ' and " (e.g. 5'2" to cm)
• Fix a*x+b*ln(x)=c where sgn(a)!=sgn(b) (only one solution were found)
• Fix segfault when calculating limit for expression with sinh or cosh (also affects integrals with infinite lower or upper limit)
• Fix RPN syntax for expressions with multiple functions
• Fix input of operators with alternate characters popup enabled with plasma-keyboard version 6.7.0 or 6.7.1
• Minor bug fixes and feature enhancements

Changes:

• Add set functions (union, intersect, setdiff, setxor, isMember, isSubset) and operators (∪, ∩, ∖, ⊖, ∈, ⊆, etc.)
• Add characters(), count(), digitSum(), and digitalRoot(), find(), popCount(), string(), and while() functions
• Support negative row and column values in element(), row(), and column() functions
• Support matrix[row][column] syntax
• Support text objects in sort() function
• Add third optional argument to interval() function to allow exclusion of exact endpoints
• Ignore "to" and "where" (and equivalent symbols) inside quotation marks
• Ignore dot in front of plus or minus (for consistent behavior in line with entrywise operators)
• Show "Division by zero" warning for all divisions by zero
• Make display of expressions with time units in time format more consistent
• Toggle state of checkboxes in lists (e.g. precalculate checkbox, and in names edit dialog) when clicking anywhere in the column
• Fix parse status and calculate-as-you-type when "where" expression defines a new symbol
• Fix support for vector in argument of many functions (erf, mod, exp, etc.)
• Fix explicit conversion to mixed units for year variants
• Fix first digit missing in return value of integerDigits() in some cases
• Fix segfault when Calculator object is destroyed with uninitialized random state
• Fix infinite loop when referencing subfunction in another subfunction
• Fix segfault in replace() with variable specified using where expression, e.g. "replace(v, x, 1) where v = x"
• Fix segfault when data set function name is followed immediately by a single dot
• Fix v[i]=a syntax for vector element assignment
• Georgian translation
• Minor bug fixes and feature enhancements

Changes:

• Improve factorization and simplification (particularly with radicals, logarithms, and absolute value)
• Add ton of refrigeration, slug, mol/dm³, mol/L, and molar units
• Add pcm, ppm, ppb, ppt, and ppq (parts per …), and lakh and crore variables
• Add XAG, XAU, XPD, and XPT currencies (precious metals)
• Use a maximum 4 decimals and minimum of 2 decimals by default for display of value of converted currencies
• Improve handling of "to mixed" after previous conversion statement (e.g. "1 m to in to mixed")
• Improve interval calculation, with interval arithmetic, with division by zero and/or both real and complex numbers in derivative of expression
• Treat 0^0 as undefined (instead of equal to 1), and fix limit for 0^0
• Set initial random seed using /dev/random
• Do not show warning about denominators assumed non-zero when converting to expression with non-unit objects
• Do not show negative exponents (if "negexp" is deactivated) when expressions contains unknown variables, even if all units have negative exponents
• Do not show possibly real expression in complex exponential form
• Initial support for comparison of vectors and matrices
• Allow use of apostrophe as thousands separator in input, when specified as such by locale
• Fix segfault with recursive variable in "where" expression
• Fix segfault in some cases when argument in det() contains only a single element
• Fix wrong simplification of "sin(2-cosh(x)^2/x+x)"
• Fix negative exponents always used for units with rounding set to (halfway) down or up
• Fix adaptive interval display for calculate-as-you-type result
• Fixes and improvements for number bases view
• Minor bug fixes and feature enhancements