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Lazarus IDE and 组件 下载地址版权申明
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公式解析计算组件

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发表于 2013-2-6 05:49:17 | 显示全部楼层 |阅读模式
因为需要,在http://www.lazarus.freepascal.org/上查到的。组件网址http://artsoft.nm.ru/download.html

ArtFormula
package contains two nonvisual Delphi and Lazarus componenst for symbolic expression parsing and evaluation. Provides runtime scripting engine for automating your programs.

Provides:

  • 7 arithmetic operations
  • 10 logical operations
  • 6 bitwise operations
  • string concatenation (@) and like (==) operator
  • 24 arithmetic functions
  • 10 statistical functions
  • 2 logical functions
  • 17 string functions
  • 13 date functions
  • 14 programming functions
  • User defined constant
  • User defined variables
  • User defined functions (modules)
  • Subroutines, global vars and constants
  • Symbolical differentiation of functions with basic simplification of resulting derivatives

Arithmetic operation:
x + y, x - y, x * y, x / y, x % y (Mod), x ^ y (power), x\ y (Div)

Logical operation (true=1, false=0):
x > y, x < y, x >= y, x <= y, x = y, x <> y, ! x (not), x & y (and), x | y (or), x xor y

Bitwise operations:
x && y (band), x || y (bor), !!x (bnot), x bxor y, x >> y (shr), x << y (shl)

Predefined constants:
Pi = 3.1415926535897932385
True = 1
False = 0

Functions:
sin, cos, tan, sinh, cosh, tanh, asin, acos, atan, asinh, acosh, atanh, sqrt, exp, log, lg (log base 10), int (integer part of a number), frac (fractional part of a number), abs, sign, rnd, randomize, trunc (truncates value to a specified number of digits), round (rounds value to a specified number of digits)
max(x,y...), min(x,y,...), count(x,y,...), sum(x,y,...), sumofsquares(x,y,...), avg(x,y,...), variance(x,y,...), variancep(x,y,...), stddev(x,y,...), stddevp(x,y,...)
iff(cond,x,y) (if cond = true then result = x else result = y),
isnumber(x)
chr(x), length(s), trim(s), trimleft(s), trimright(s) lowercase(s), uppercase(s), midstr(s,x,y), leftstr(s,x), rightstr(s,x), pos(s,t), code(s), format(s,x), formatf(s,x), stringofchar(c,n), concat(s1,s2,...), hex(s)
date(s), now, formatdate(s,d), year(d), month(d), day(d), hour(d), minute(d), second(d), millisecond(d), isleapyear(n), dayofweek(d), encodedate(y,m,d)

Programming:

TArtFormula provides two styles of programming: formula style and scripting style. The first style assumes that all statements have the form of function call. The second style imply that you use common program language notation.

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发表于 2013-2-24 21:57:01 | 显示全部楼层
不错!
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