1 | head 1.3;
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2 | access;
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3 | symbols;
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4 | locks; strict;
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5 | comment @;;; @;
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6 |
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7 |
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8 | 1.3
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9 | date 2009.01.22.04.06.32; author marek; state Exp;
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10 | branches;
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11 | next 1.2;
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12 |
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13 | 1.2
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14 | date 2009.01.19.09.29.46; author marek; state Exp;
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15 | branches;
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16 | next 1.1;
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17 |
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18 | 1.1
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19 | date 2009.01.19.07.51.57; author marek; state Exp;
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20 | branches;
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21 | next ;
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22 |
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23 |
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24 | desc
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25 | @@
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26 |
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27 |
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28 | 1.3
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29 | log
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30 | @*** empty log message ***
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31 | @
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32 | text
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33 | @#|
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34 | $Id$
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35 | *--------------------------------------------------------------------------*
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36 | | Copyright (C) 1994, Marek Rychlik (e-mail: rychlik@@math.arizona.edu) |
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37 | | Department of Mathematics, University of Arizona, Tucson, AZ 85721 |
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38 | | |
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39 | | Everyone is permitted to copy, distribute and modify the code in this |
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40 | | directory, as long as this copyright note is preserved verbatim. |
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41 | *--------------------------------------------------------------------------*
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42 | |#
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43 | (defpackage "PRINTER"
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44 | (:export poly-print print-term print-monom)
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45 | (:use "COMMON-LISP"))
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46 |
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47 | (in-package "PRINTER")
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48 |
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49 | #+debug(proclaim '(optimize (speed 0) (debug 3)))
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50 | #-debug(proclaim '(optimize (speed 3) (safety 0)))
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51 |
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52 | (defun poly-print (plist vars &optional (stream t))
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53 | "Prints a polynomial or a list of polynomials PLIST using infix syntax compatible
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54 | with most software systems. The following data representations are assumed:
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55 | 1) Polynomial list is ([ poly1 poly2 ...)
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56 | 2) Polynomial is a list (term1 term2 ...)
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57 | 3) Term is (monom . number)
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58 | 4) Monom is (number1 number2 ...) and is a list of powers at corresponding
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59 | variables
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60 | Variable names must be provided to the printer explicitly."
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61 | (cond
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62 | ((and (symbolp (car plist)) (string= (symbol-name (car plist)) "["))
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63 | (format stream "[ ")
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64 | (poly-print-2 (rest plist) vars stream)
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65 | (format stream " ]"))
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66 | ;; Not a list but a single polynomial
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67 | (t (poly-print-1 plist vars stream))))
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68 |
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69 | (defun poly-print-1 (p vars &optional (stream t))
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70 | "An auxillary function of POLY-PRINT. It prints a single polynomial P."
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71 | (labels ((infix-sum (l &optional (beg t))
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72 | (unless (endp l)
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73 | (infix-term (first l) beg)
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74 | (infix-sum (rest l) nil)))
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75 | (infix-term (l &optional beg)
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76 | (unless (zerop (cdr l))
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77 | (case (cdr l)
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78 | (1 (unless beg (format stream " + "))
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79 | (infix-monom (first l) vars t))
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80 | (-1 (format stream " - ") (infix-monom (first l) vars t))
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81 | (otherwise
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82 | (cond
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83 | ((plusp (cdr l)) (unless beg (format stream " + ")))
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84 | ((minusp (cdr l)) (format stream " - ")))
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85 | (format stream "~d" (abs (cdr l)))
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86 | (infix-monom (first l) vars nil)))))
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87 | (infix-monom (l vars &optional beg)
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88 | (cond
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89 | ((endp l) (when beg (format stream "~d" 1)))
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90 | (t
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91 | (unless (zerop (car l))
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92 | (unless beg (format stream " * "))
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93 | ;; if in x^n we have n=1 then print just x
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94 | (format stream "~a~:[^~d~;~*~]" (car vars)
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95 | (= (car l) 1) (car l)))
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96 | (infix-monom (rest l) (rest vars) (and (zerop (car l)) beg)))
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97 | )))
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98 | (if (endp p)
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99 | (format stream "0")
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100 | (infix-sum p)))
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101 | p)
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102 |
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103 | (defun poly-print-2 (plist vars stream &optional (beg t))
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104 | "An auxillary function of POLY-PRINT. It prints a comma-separated list of polynomials PLIST."
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105 | (unless (endp plist)
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106 | (unless beg (format stream ", "))
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107 | (poly-print-1 (first plist) vars stream)
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108 | (poly-print-2 (rest plist) vars stream nil)))
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109 |
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110 |
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111 | (defun print-term (l vars &optional (stream t) beg)
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112 | "An auxillary function of POLY-PRINT. It prints a single term L."
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113 | (unless (zerop (cdr l))
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114 | (case (cdr l)
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115 | (1 (unless beg (format stream " + "))
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116 | (print-monom (first l) vars stream t))
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117 | (-1 (format stream " - ") (print-monom (first l) vars stream t))
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118 | (otherwise
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119 | (cond
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120 | ((plusp (cdr l)) (unless beg (format stream " + ")))
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121 | ((minusp (cdr l)) (format stream " - ")))
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122 | (format stream "~d" (abs (cdr l)))
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123 | (print-monom (first l) vars stream nil)))))
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124 |
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125 | (defun print-monom (l vars &optional (stream t) beg)
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126 | "An auxillary function of POLY-PRINT. It prints a single monomial L."
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127 | (cond
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128 | ((endp l) (when beg (format stream "~d" 1)))
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129 | (t
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130 | (unless (zerop (car l))
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131 | (unless beg (format stream " * "))
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132 | ;; if in x^n we have n=1 then print just x
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133 | (format stream "~a~:[^~d~;~*~]" (car vars)
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134 | (= (car l) 1) (car l)))
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135 | (print-monom (rest l) (rest vars) stream (and (zerop (car l)) beg)))
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136 | ))
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137 | @
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138 |
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139 |
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140 | 1.2
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141 | log
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142 | @*** empty log message ***
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143 | @
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144 | text
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145 | @d17 2
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146 | a18 2
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147 | ;;(proclaim '(optimize (speed 0) (debug 3)))
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148 | (proclaim '(optimize (speed 3) (safety 0)))
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149 | @
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150 |
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151 |
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152 | 1.1
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153 | log
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154 | @Initial revision
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155 | @
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156 | text
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157 | @d2 1
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158 | a2 1
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159 | $Id: printer.lisp,v 1.7 1997/12/03 06:05:32 marek Exp $
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160 | d17 2
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161 | a18 1
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162 | (proclaim '(optimize (speed 0) (debug 3)))
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163 | @
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