介绍

Qalculate! 多功能计算器，一款桌面系统上的一个计算器软件，提供所需要的各种计算器优化项目，提供科学计算器功能，比电脑自带的计算器软件要更加强大，一些科研与学术领域所需要的计算要求也能满足。

软件截图

软件特点

计算与解析：

基本运算和操作符：+ – * / ^ E () && || ! < > >= <= != ~ & | << >>

字符串的容错解析：log5/2.5(3)+(2(3+5 = ln(5)/(2.53)+23+5)

表达式可以包含数字、函数、单位、变量、向量、矩阵及日期的任意组合

支持复数和无穷量（∞）

误差传递

区间算法（用于确定有效数字或直接计算间隔的数）

支持所有常用进制，以及负数、非整数根，六十进制数，时间格式和罗马数字

可以禁用函数、变量、单位或未知数以避免混淆，例如：(a+b)^2 不表示 (are+barn)^2

而是 (“a”+”b”)^2

可控的隐式乘法

支持矩阵、向量以及相关运算（行列式等）

详细错误消息

高精度计算

RPN 模式（逆波兰式计算）

结果显示：

支持所有常用进制，以及负数、非整数根，六十进制数，时间格式和罗马数字

许多自定义选项：精度、小数位数和乘号等

精确（=）或近似（≈）

分式：4/6*2=1.333… = 4/3=1+1/3

符号运算：

例如：(x + y)^2 = x^2 + 2xy + y^2; 4 “apples” + 3 “oranges”

因子分解和简化

微分与积分

能解大多数方程和不等式

自定义假设得到不同结果，例如：ln(2x) = ln(2) + ln(x) 如果 x 为正

能解大多数方程和不等式

函数：

所有常用函数：sine, log, 等…例如：ln5 = 1.609; sqrt(tan(20)-5) = sqrt(-2.76283905578)

大量统计、金融、几何及更多领域的函数（大约 200个）

If..then..else 函数，可选参数及可灵活创建更多特性的函数

能解大多数方程和不等式

单位：

支持所有国际单位制单位和前缀（包括二进制），也包括英制及其他单位系统

自动转换：ft + yd + m = 2.2192 m

隐式转换：5 m/s to mi/h = 11.18 miles/hour

智能转换：可将 5 kg*m/s^2 转换为 5 newton

误差传递

区间算法（用于确定有效数字或直接计算间隔的数）

容易创建、编辑或保存为标准 XML 文件

常量和变量：

基本常量：pi, e

大量物理常量和元素

可导入/导出为 CSV

容易创建、编辑或保存为标准 XML 文件

灵活，可以包含简单的数字、单位或者整个表达式

在类似数据库结构中包含对象和属性关联的数据集

绘图：

采用gnuplot

可绘制函数和数据（矩阵、向量）

支持保存绘制图像为 PNG、postscript等…

多个自定义选项

更新日志

5.0.0

Click on binary digit in result to flip bit
Selection of default number of bits for binary and hexadecimal numbers in programming keypad
Always show binary position numbers in result if numbers of bits are higher than 16, and improve appearance
Improvements/fixes to conversion completion and menus
Add retry and cancel buttons to error dialog after failure to save preferences, definitions, or workspace
Add last result to stack when pressing Enter with empty expression (was unintentionally disabled)
Selection of default number of bits for binary and hexadecimal numbers in programming keypad
Always show binary position numbers in result if numbers of bits are higher than 16, and improve appearance
More rounding methods
Support for hexadecimal floating-point literals using 0x...p... notation (0x1.4p3 = 0x1.4 * 2^3 = 10)
Use parentheses for number with scientific notation in more cases
Fix x and y reversed for paired matrix when using plot dialog
Detection of potential spelling mistakes (a warning will be shown) (libqalculate)
Add support for n...m, j:k, and j:i:k syntax, for sequence of numbers, e.g. 1...3 = (1:3) = (1:1:3) = [1 2 3] (note that brackets may be required for colon syntax to avoid conflict with time format) (libqalculate)
Improved "where" operator, including improved output of parsed expression, support for previously undefined variable names, and assignments before expression (e.g. "a=2, b=2, a^b") (libqalculate)
New units: LightSecond, LightMinute, and LightHour (libqalculate)
New functions: bitget(), bitset(), setbits(), integerDigits(), digitGet(), digitSet(), flip(), colon(), and foreach() (libqalculate)
Add support for "decimals" "to"-conversion (display as decimal fraction) (libqalculate)
Allow plot grid values higher than 1 (true) to specify line width (libqalculate)
Improve handling of zero solution and initial guess in newtonsolve() and secantsolve(), and check validity of solution (libqalculate)
Change handling a vectors in multiple function arguments (of non-vector type) - return vector instead of matrix, require equal number of elements, and use the same vector index for all arguments for each function instance (e.g. atan2([1 2], [3 4]) = [atan2(1, 3) atan(2 4)] (libqalculate)
Set handle vector property by default, for text, date, and boolean arguments, and for arguments, in global non-builtin functions, without specified type, and enable parsing of vectors for text arguments (libqalculate)
Do not apply "read precision" setting to integer exponents for values with units (libqalculate)
Change from line to point (or dot) plot style for data with many discontinuous points (libqalculate)
lambertw(x*e^x, 0)=x if x>=-1 (libqalculate)
Fix dsolve(diff(y, x) = y), and similar (libqalculate)
Fix log(1, 1) (undefined) (libqalculate)
Fix "to"-conversion to prefix and add "prefix" conversion option (for optimal prefix) (libqalculate)
Fix segfault in newtonsolve() and secantsolve() when equation does not contain variable (libqalculate)
Fix conversion to angle unit for complex angle, cis and polar forms (libqalculate)
Exchange rates fixes (libqalculate)
Minor bug fixes and feature enhancements