REBOL [ Title: "Ascii math" File: %ascii-math.r Author: "Scott Wall" Date: 24-Feb-2009 Version: 0.0.0 Purpose: {Defines functions and variables for arithmetic ASCII characters} History: [ 0.0.0 24-Feb-2009 swall "Released" ] Library: [ level: 'beginner platform: 'all type: [function one-liner] domain: [scientific math] tested-under: [core 2.7.6.3.1 Windows XP] support: none license: GPL see-also: none Disclaimer: {this was tested for UTF-8 and may not work for other encodings.} ] ] comment { The following constants and functions are defined and may be entered in VIM with the indicated keystrokes. Constant Ascii to enter in VIM (with digraphs enabled) ¼ 188 ^k14 ½ 189 ^k12 ¾ 190 ^k34 Function Description Ascii to enter in VIM ² square 178 ^k22 ²/¯ square root 178/175 ^k22/^k'm ³ cube 179 ^k33 ³/¯ cubic root 179/175 ^k33/^k'm ÷ divide 247 ^k-: × multiply 215 ^k*X Each function uses prefix notation and the operands follow the function name. For example ² 3 calculates the square of 3. Using hof.r, the formula for kinetic energy can be written as: K: product reduce [½ m ² v] } ; literal constants ¼: 0.25 ½: 0.5 ¾: 0.75 ; functions ²: func [a [number!] /¯ ][ either ¯ [square-root a][multiply a a ] ] ³: func [a [number!] /¯ ][ either ¯ [power a divide 1 3][multiply a ² a ] ] ÷: func [a [number!] b [number!]][divide a b] ×: func [a [number!] b [number!]][multiply a b] comment { ; the following function definitions exclude the refinement. ²: func [a [number!]][ multiply a a ] ³: func [a [number!]][ multiply a ² a ] } comment { ; Tests: t1: [² (4 + 3)] t2: [³ (2 + 3)] t3: [²/¯ 16] t4: [³/¯ 8] print [t1 ": " reduce t1] print [t2 ": " reduce t2] print [t3 ": " reduce t3] print [t4 ": " reduce t4] }