Languguage OS 2/Languguage OS II Version 10-94 (Knowledge Media)(1994).ISO/gnu/calc202a.lha/calc-2.02a/calc-stat.el

Lisp/Scheme | 1993-06-01 | 18KB | 630 lines

;; Calculator for GNU Emacs, part II [calc-stat.el]
;; Copyright (C) 1990, 1991, 1992, 1993 Free Software Foundation, Inc.
;; Written by Dave Gillespie, [e-mail].

;; This file is part of GNU Emacs.

;; GNU Emacs is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY.  No author or distributor
;; accepts responsibility to anyone for the consequences of using it
;; or for whether it serves any particular purpose or works at all,
;; unless he says so in writing.  Refer to the GNU Emacs General Public
;; License for full details.

;; Everyone is granted permission to copy, modify and redistribute
;; GNU Emacs, but only under the conditions described in the
;; GNU Emacs General Public License.   A copy of this license is
;; supposed to have been given to you along with GNU Emacs so you
;; can know your rights and responsibilities.  It should be in a
;; file named COPYING.  Among other things, the copyright notice
;; and this notice must be preserved on all copies.



;; This file is autoloaded from calc-ext.el.
(require 'calc-ext)

(require 'calc-macs)

(defun calc-Need-calc-stat () nil)


;;; Statistical operations on vectors.

(defun calc-vector-count (arg)
  (interactive "P")
  (calc-slow-wrapper
   (calc-vector-op "coun" 'calcFunc-vcount arg))
)

(defun calc-vector-sum (arg)
  (interactive "P")
  (calc-slow-wrapper
   (if (calc-is-hyperbolic)
       (calc-vector-op "vprd" 'calcFunc-vprod arg)
     (calc-vector-op "vsum" 'calcFunc-vsum arg)))
)

(defun calc-vector-product (arg)
  (interactive "P")
  (calc-hyperbolic-func)
  (calc-vector-sum arg)
)

(defun calc-vector-max (arg)
  (interactive "P")
  (calc-slow-wrapper
   (if (calc-is-inverse)
       (calc-vector-op "vmin" 'calcFunc-vmin arg)
     (calc-vector-op "vmax" 'calcFunc-vmax arg)))
)

(defun calc-vector-min (arg)
  (interactive "P")
  (calc-invert-func)
  (calc-vector-max arg)
)

(defun calc-vector-mean (arg)
  (interactive "P")
  (calc-slow-wrapper
   (if (calc-is-hyperbolic)
       (if (calc-is-inverse)
       (calc-vector-op "harm" 'calcFunc-vhmean arg)
     (calc-vector-op "medn" 'calcFunc-vmedian arg))
     (if (calc-is-inverse)
     (calc-vector-op "meae" 'calcFunc-vmeane arg)
       (calc-vector-op "mean" 'calcFunc-vmean arg))))
)

(defun calc-vector-mean-error (arg)
  (interactive "P")
  (calc-invert-func)
  (calc-vector-mean arg)
)

(defun calc-vector-median (arg)
  (interactive "P")
  (calc-hyperbolic-func)
  (calc-vector-mean arg)
)

(defun calc-vector-harmonic-mean (arg)
  (interactive "P")
  (calc-invert-func)
  (calc-hyperbolic-func)
  (calc-vector-mean arg)
)

(defun calc-vector-geometric-mean (arg)
  (interactive "P")
  (calc-slow-wrapper
   (if (calc-is-hyperbolic)
       (calc-binary-op "geom" 'calcFunc-agmean arg)
     (calc-vector-op "geom" 'calcFunc-vgmean arg)))
)

(defun calc-vector-sdev (arg)
  (interactive "P")
  (calc-slow-wrapper
   (if (calc-is-hyperbolic)
       (if (calc-is-inverse)
       (calc-vector-op "pvar" 'calcFunc-vpvar arg)
     (calc-vector-op "var" 'calcFunc-vvar arg))
     (if (calc-is-inverse)
     (calc-vector-op "psdv" 'calcFunc-vpsdev arg)
       (calc-vector-op "sdev" 'calcFunc-vsdev arg))))
)

(defun calc-vector-pop-sdev (arg)
  (interactive "P")
  (calc-invert-func)
  (calc-vector-sdev arg)
)

(defun calc-vector-variance (arg)
  (interactive "P")
  (calc-hyperbolic-func)
  (calc-vector-sdev arg)
)

(defun calc-vector-pop-variance (arg)
  (interactive "P")
  (calc-invert-func)
  (calc-hyperbolic-func)
  (calc-vector-sdev arg)
)

(defun calc-vector-covariance (arg)
  (interactive "P")
  (calc-slow-wrapper
   (let ((n (if (eq arg 1) 1 2)))
     (if (calc-is-hyperbolic)
     (calc-enter-result n "corr" (cons 'calcFunc-vcorr
                       (calc-top-list-n n)))
       (if (calc-is-inverse)
       (calc-enter-result n "pcov" (cons 'calcFunc-vpcov
                         (calc-top-list-n n)))
     (calc-enter-result n "cov" (cons 'calcFunc-vcov
                      (calc-top-list-n n)))))))
)

(defun calc-vector-pop-covariance (arg)
  (interactive "P")
  (calc-invert-func)
  (calc-vector-covariance arg)
)

(defun calc-vector-correlation (arg)
  (interactive "P")
  (calc-hyperbolic-func)
  (calc-vector-covariance arg)
)

(defun calc-vector-op (name func arg)
  (setq calc-aborted-prefix name
    arg (prefix-numeric-value arg))
  (if (< arg 0)
      (error "Negative arguments not allowed"))
  (calc-enter-result arg name (cons func (calc-top-list-n arg)))
)




;;; Useful statistical functions

;;; Sum, product, etc., of one or more values or vectors.
;;; Each argument must be either a number or a vector.  Vectors
;;; are flattened, but variables inside are assumed to represent
;;; non-vectors.

(defun calcFunc-vsum (&rest vecs)
  (math-reduce-many-vecs 'calcFunc-add 'calcFunc-vsum vecs 0)
)

(defun calcFunc-vprod (&rest vecs)
  (math-reduce-many-vecs 'calcFunc-mul 'calcFunc-vprod vecs 1)
)

(defun calcFunc-vmax (&rest vecs)
  (if (eq (car-safe (car vecs)) 'sdev)
      '(var inf var-inf)
    (if (eq (car-safe (car vecs)) 'intv)
    (nth 3 (math-fix-int-intv (car vecs)))
      (math-reduce-many-vecs 'calcFunc-max 'calcFunc-vmax vecs
                 '(neg (var inf var-inf)))))
)

(defun calcFunc-vmin (&rest vecs)
  (if (eq (car-safe (car vecs)) 'sdev)
      '(neg (var inf var-inf))
    (if (eq (car-safe (car vecs)) 'intv)
    (nth 2 (math-fix-int-intv (car vecs)))
      (math-reduce-many-vecs 'calcFunc-min 'calcFunc-vmin vecs
                 '(var inf var-inf))))
)

(defun math-reduce-many-vecs (func whole-func vecs ident)
  (let ((const-part nil)
    (symb-part nil)
    val vec)
    (let ((calc-internal-prec (+ calc-internal-prec 2)))
      (while vecs
    (setq val (car vecs))
    (and (eq (car-safe val) 'var)
         (eq (car-safe (calc-var-value (nth 2 val))) 'vec)
         (setq val (symbol-value (nth 2 val))))
    (cond ((Math-vectorp val)
           (setq vec (append (and const-part (list const-part))
                 (math-flatten-vector val)))
           (setq const-part (if vec
                    (calcFunc-reducer
                     (math-calcFunc-to-var func)
                     (cons 'vec vec))
                  ident)))
          ((or (Math-objectp val) (math-infinitep val))
           (setq const-part (if const-part
                    (funcall func const-part val)
                  val)))
          (t
           (setq symb-part (nconc symb-part (list val)))))
    (setq vecs (cdr vecs))))
    (if const-part
    (progn
      (setq const-part (math-normalize const-part))
      (if symb-part
          (funcall func const-part (cons whole-func symb-part))
        const-part))
      (if symb-part (cons whole-func symb-part) ident)))
)


;;; Return the number of data elements among the arguments.
(defun calcFunc-vcount (&rest vecs)
  (let ((count 0))
    (while vecs
      (setq count (if (Math-vectorp (car vecs))
              (+ count (math-count-elements (car vecs)))
            (if (Math-objectp (car vecs))
            (1+ count)
              (if (and (eq (car-safe (car vecs)) 'var)
                   (eq (car-safe (calc-var-value
                          (nth 2 (car vecs))))
                   'vec))
              (+ count (math-count-elements
                    (symbol-value (nth 2 (car vecs)))))
            (math-reject-arg (car vecs) 'numvecp))))
        vecs (cdr vecs)))
    count)
)

(defun math-count-elements (vec)
  (let ((count 0))
    (while (setq vec (cdr vec))
      (setq count (if (Math-vectorp (car vec))
              (+ count (math-count-elements (car vec)))
            (1+ count))))
    count)
)


(defun math-flatten-many-vecs (vecs)
  (let ((p vecs)
    (vec (list 'vec)))
    (while p
      (setq vec (nconc vec
               (if (Math-vectorp (car p))
               (math-flatten-vector (car p))
             (if (Math-objectp (car p))
                 (list (car p))
               (if (and (eq (car-safe (car p)) 'var)
                    (eq (car-safe (calc-var-value
                           (nth 2 (car p)))) 'vec))
                   (math-flatten-vector (symbol-value
                             (nth 2 (car p))))
                 (math-reject-arg (car p) 'numvecp)))))
        p (cdr p)))
    vec)
)

(defun calcFunc-vflat (&rest vecs)
  (math-flatten-many-vecs vecs)
)

(defun math-split-sdev-vec (vec zero-ok)
  (let ((means (list 'vec))
    (wts (list 'vec))
    (exact nil)
    (p vec))
    (while (and (setq p (cdr p))
        (not (and (consp (car p))
              (eq (car (car p)) 'sdev)))))
    (if (null p)
    (list vec nil)
      (while (setq vec (cdr vec))
    (if (and (consp (setq p (car vec)))
         (eq (car p) 'sdev))
        (or exact
        (setq means (cons (nth 1 p) means)
              wts (cons (nth 2 p) wts)))
      (if zero-ok
          (setq means (cons (nth 1 p) means)
            wts (cons 0 wts))
        (or exact
        (setq means (list 'vec)
              wts nil
              exact t))
        (setq means (cons p means)))))
      (list (nreverse means)
        (and wts (nreverse wts)))))
)


;;; Return the arithmetic mean of the argument numbers or vectors.
;;; (If numbers are error forms, computes the weighted mean.)
(defun calcFunc-vmean (&rest vecs)
  (let* ((split (math-split-sdev-vec (math-flatten-many-vecs vecs) nil))
     (means (car split))
     (wts (nth 1 split))
     (len (1- (length means))))
    (if (= len 0)
    (math-reject-arg nil "*Must be at least 1 argument")
      (if (and (= len 1) (eq (car-safe (nth 1 means)) 'intv))
      (let ((x (math-fix-int-intv (nth 1 means))))
        (calcFunc-vmean (nth 2 x) (nth 3 x)))
    (math-with-extra-prec 2
      (if (and wts (> len 1))
          (let* ((sqrwts (calcFunc-map '(var mul var-mul) wts wts))
             (suminvsqrwts (calcFunc-reduce
                    '(var add var-add)
                    (calcFunc-map '(var div var-div)
                          1 sqrwts))))
        (math-div (calcFunc-reduce '(var add var-add)
                       (calcFunc-map '(var div var-div)
                             means sqrwts))
              suminvsqrwts))
        (math-div (calcFunc-reduce '(var add var-add) means) len))))))
)

(defun math-fix-int-intv (x)
  (if (math-floatp x)
      x
    (list 'intv 3
      (if (memq (nth 1 x) '(2 3)) (nth 2 x) (math-add (nth 2 x) 1))
      (if (memq (nth 1 x) '(1 3)) (nth 3 x) (math-sub (nth 3 x) 1))))
)

;;; Compute the mean with an error estimate.
(defun calcFunc-vmeane (&rest vecs)
  (let* ((split (math-split-sdev-vec (math-flatten-many-vecs vecs) nil))
     (means (car split))
     (wts (nth 1 split))
     (len (1- (length means))))
    (if (= len 0)
    (math-reject-arg nil "*Must be at least 1 argument")
      (math-with-extra-prec 2
    (if wts
        (let* ((sqrwts (calcFunc-map '(var mul var-mul) wts wts))
           (suminvsqrwts (calcFunc-reduce
                  '(var add var-add)
                  (calcFunc-map '(var div var-div)
                        1 sqrwts))))
          (math-make-sdev
           (math-div (calcFunc-reduce '(var add var-add)
                      (calcFunc-map '(var div var-div)
                            means sqrwts))
             suminvsqrwts)
           (list 'calcFunc-sqrt (math-div 1 suminvsqrwts))))
      (let ((mean (math-div (calcFunc-reduce '(var add var-add) means)
                len)))
        (math-make-sdev
         mean
         (list 'calcFunc-sqrt
           (math-div (calcFunc-reducer
                  '(var add var-add)
                  (calcFunc-map '(var pow var-pow)
                        (calcFunc-map '(var abs var-abs)
                              (calcFunc-map
                               '(var add var-add)
                               means
                               (math-neg mean)))
                        2))
                 (math-mul len (1- len))))))))))
)


;;; Compute the median of a list of values.
(defun calcFunc-vmedian (&rest vecs)
  (let* ((flat (copy-sequence (cdr (math-flatten-many-vecs vecs))))
     (p flat)
     (len (length flat))
     (hlen (/ len 2)))
    (if (= len 0)
    (math-reject-arg nil "*Must be at least 1 argument")
      (if (and (= len 1) (memq (car-safe (car flat)) '(sdev intv)))
      (calcFunc-vmean (car flat))
    (while p
      (if (eq (car-safe (car p)) 'sdev)
          (setcar p (nth 1 (car p))))
      (or (Math-anglep (car p))
          (math-reject-arg (car p) 'anglep))
      (setq p (cdr p)))
    (setq flat (sort flat 'math-lessp))
    (if (= (% len 2) 0)
        (math-div (math-add (nth (1- hlen) flat) (nth hlen flat)) 2)
      (nth hlen flat)))))
)


(defun calcFunc-vgmean (&rest vecs)
  (let* ((flat (math-flatten-many-vecs vecs))
     (len (1- (length flat))))
    (if (= len 0)
    (math-reject-arg nil "*Must be at least 1 argument")
      (math-with-extra-prec 2
    (let ((x (calcFunc-reduce '(var mul math-mul) flat)))
      (if (= len 2)
          (math-sqrt x)
        (math-pow x (list 'frac 1 len)))))))
)


(defun calcFunc-agmean (a b)
  (cond ((Math-equal a b) a)
    ((math-zerop a) a)
    ((math-zerop b) b)
    (calc-symbolic-mode (math-inexact-result))
    ((not (Math-realp a)) (math-reject-arg a 'realp))
    ((not (Math-realp b)) (math-reject-arg b 'realp))
    (t
     (math-with-extra-prec 2
       (setq a (math-float (math-abs a))
         b (math-float (math-abs b)))
       (let (mean)
         (while (not (math-nearly-equal-float a b))
           (setq mean (math-mul-float (math-add-float a b) '(float 5 -1))
             b (math-sqrt-float (math-mul-float a b))
             a mean))
         a))))
)


(defun calcFunc-vhmean (&rest vecs)
  (let* ((flat (math-flatten-many-vecs vecs))
     (len (1- (length flat))))
    (if (= len 0)
    (math-reject-arg nil "*Must be at least 1 argument")
      (math-with-extra-prec 2
    (math-div len
          (calcFunc-reduce '(var add math-add)
                   (calcFunc-map '(var inv var-inv) flat))))))
)



;;; Compute the sample variance or standard deviation of numbers or vectors.
;;; (If the numbers are error forms, only the mean part of them is used.)
(defun calcFunc-vvar (&rest vecs)
  (if (and (= (length vecs) 1)
       (memq (car-safe (car vecs)) '(sdev intv)))
      (if (eq (car-safe (car vecs)) 'intv)
      (math-intv-variance (car vecs) nil)
    (math-sqr (nth 2 (car vecs))))
    (math-covariance vecs nil nil 0))
)

(defun calcFunc-vsdev (&rest vecs)
  (if (and (= (length vecs) 1)
       (memq (car-safe (car vecs)) '(sdev intv)))
      (if (eq (car-safe (car vecs)) 'intv)
      (if (math-floatp (car vecs))
          (math-div (math-sub (nth 3 (car vecs)) (nth 2 (car vecs)))
            (math-sqrt-12))
        (math-sqrt (calcFunc-vvar (car vecs))))
    (nth 2 (car vecs)))
    (math-sqrt (math-covariance vecs nil nil 0)))
)

;;; Compute the population variance or std deviation of numbers or vectors.
(defun calcFunc-vpvar (&rest vecs)
  (if (and (= (length vecs) 1)
       (memq (car-safe (car vecs)) '(sdev intv)))
      (if (eq (car-safe (car vecs)) 'intv)
      (math-intv-variance (car vecs) t)
    (math-sqr (nth 2 (car vecs))))
    (math-covariance vecs nil t 0))
)

(defun calcFunc-vpsdev (&rest vecs)
  (if (and (= (length vecs) 1)
       (memq (car-safe (car vecs)) '(sdev intv)))
      (if (eq (car-safe (car vecs)) 'intv)
      (if (math-floatp (car vecs))
          (math-div (math-sub (nth 3 (car vecs)) (nth 2 (car vecs)))
            (math-sqrt-12))
        (math-sqrt (calcFunc-vpvar (car vecs))))
    (nth 2 (car vecs)))
    (math-sqrt (math-covariance vecs nil t 0)))
)

(defun math-intv-variance (x pop)
  (or (math-constp x) (math-reject-arg x 'constp))
  (if (math-floatp x)
      (math-div (math-sqr (math-sub (nth 3 x) (nth 2 x))) 12)
    (let* ((x (math-fix-int-intv x))
       (len (math-sub (nth 3 x) (nth 2 x)))
       (hlen (math-quotient len 2)))
      (math-div (if (math-evenp len)
            (calcFunc-sum '(^ (var X var-X) 2) '(var X var-X)
                  (math-neg hlen) hlen)
          (calcFunc-sum '(^ (- (var X var-X) (/ 1 2)) 2)
                '(var X var-X)
                (math-neg hlen) (math-add hlen 1)))
        (if pop (math-add len 1) len))))
)

;;; Compute the covariance and linear correlation coefficient.
(defun calcFunc-vcov (vec1 &optional vec2)
  (math-covariance (list vec1) (list vec2) nil 1)
)

(defun calcFunc-vpcov (vec1 &optional vec2)
  (math-covariance (list vec1) (list vec2) t 1)
)

(defun calcFunc-vcorr (vec1 &optional vec2)
  (math-covariance (list vec1) (list vec2) nil 2)
)


(defun math-covariance (vec1 vec2 pop mode)
  (or (car vec2) (= mode 0)
      (progn
    (if (and (eq (car-safe (car vec1)) 'var)
         (eq (car-safe (calc-var-value (nth 2 (car vec1)))) 'vec))
        (setq vec1 (symbol-value (nth 2 (car vec1))))
      (setq vec1 (car vec1)))
    (or (math-matrixp vec1) (math-dimension-error))
    (or (= (length (nth 1 vec1)) 3) (math-dimension-error))
    (setq vec2 (list (math-mat-col vec1 2))
          vec1 (list (math-mat-col vec1 1)))))
  (math-with-extra-prec 2
    (let* ((split1 (math-split-sdev-vec (math-flatten-many-vecs vec1) nil))
       (means1 (car split1))
       (wts1 (nth 1 split1))
       split2 means2 (wts2 nil)
       (sqrwts nil)
       suminvsqrwts
       (len (1- (length means1))))
      (if (< len (if pop 1 2))
      (math-reject-arg nil (if pop
                   "*Must be at least 1 argument"
                 "*Must be at least 2 arguments")))
      (if (or wts1 wts2)
      (setq sqrwts (math-add
            (if wts1
                (calcFunc-map '(var mul var-mul) wts1 wts1)
              0)
            (if wts2
                (calcFunc-map '(var mul var-mul) wts2 wts2)
              0))
        suminvsqrwts (calcFunc-reduce
                  '(var add var-add)
                  (calcFunc-map '(var div var-div) 1 sqrwts))))
      (or (= mode 0)
      (progn
        (setq split2 (math-split-sdev-vec (math-flatten-many-vecs vec2)
                          nil)
          means2 (car split2)
          wts2 (nth 2 split1))
        (or (= len (1- (length means2))) (math-dimension-error))))
      (let* ((diff1 (calcFunc-map
             '(var add var-add)
             means1
             (if sqrwts
             (math-div (calcFunc-reduce
                    '(var add var-add)
                    (calcFunc-map '(var div var-div)
                          means1 sqrwts))
                   (math-neg suminvsqrwts))
               (math-div (calcFunc-reducer '(var add var-add) means1)
                 (- len)))))
         (diff2 (if (= mode 0)
            diff1
              (calcFunc-map
               '(var add var-add)
               means2
               (if sqrwts
               (math-div (calcFunc-reduce
                      '(var add var-add)
                      (calcFunc-map '(var div var-div)
                            means2 sqrwts))
                     (math-neg suminvsqrwts))
             (math-div (calcFunc-reducer '(var add var-add) means2)
                   (- len))))))
         (covar (calcFunc-map '(var mul var-mul) diff1 diff2)))
    (if sqrwts
        (setq covar (calcFunc-map '(var div var-div) covar sqrwts)))
    (math-div
     (calcFunc-reducer '(var add var-add) covar)
     (if (= mode 2)
         (let ((var1 (calcFunc-map '(var mul var-mul) diff1 diff1))
           (var2 (calcFunc-map '(var mul var-mul) diff2 diff2)))
           (if sqrwts
           (setq var1 (calcFunc-map '(var div var-div) var1 sqrwts)
             var2 (calcFunc-map '(var div var-div) var2 sqrwts)))
           (math-sqrt
        (math-mul (calcFunc-reducer '(var add var-add) var1)
              (calcFunc-reducer '(var add var-add) var2))))
       (if sqrwts
           (if pop
           suminvsqrwts
         (math-div (math-mul suminvsqrwts (1- len)) len))
         (if pop len (1- len))))))))
)