diff options
Diffstat (limited to 'lisp/calc/calc-ext.el')
| -rw-r--r-- | lisp/calc/calc-ext.el | 33 |
1 files changed, 31 insertions, 2 deletions
diff --git a/lisp/calc/calc-ext.el b/lisp/calc/calc-ext.el index db370f766d9..563bcd9b023 100644 --- a/lisp/calc/calc-ext.el +++ b/lisp/calc/calc-ext.el @@ -659,7 +659,7 @@ ("calc-alg" calc-has-rules math-defsimplify calc-modify-simplify-mode calcFunc-collect calcFunc-esimplify calcFunc-islin calcFunc-islinnt calcFunc-lin calcFunc-linnt -calcFunc-simplify calcFunc-subst math-beforep +calcFunc-simplify calcFunc-subst calcFunc-writeoutpower math-beforep math-build-polynomial-expr math-expand-formula math-expr-contains math-expr-contains-count math-expr-depends math-expr-height math-expr-subst math-expr-weight math-integer-plus math-is-linear @@ -923,7 +923,7 @@ calc-force-refresh calc-locate-cursor-element calc-show-edit-buffer) ("calc-alg" calc-alg-evaluate calc-apart calc-collect calc-expand calc-expand-formula calc-factor calc-normalize-rat calc-poly-div calc-poly-div-rem calc-poly-gcd calc-poly-rem calc-simplify -calc-simplify-extended calc-substitute) +calc-simplify-extended calc-substitute calc-writeoutpower) ("calcalg2" calc-alt-summation calc-derivative calc-dump-integral-cache calc-integral calc-num-integral @@ -2107,6 +2107,35 @@ calc-kill calc-kill-region calc-yank)))) (and (cdr dims) (= (car dims) (nth 1 dims))))) +;;; True if MAT is an identity matrix. +(defun math-identity-matrix-p (mat &optional mul) + (if (math-square-matrixp mat) + (let ((a (if mul + (nth 1 (nth 1 mat)) + 1)) + (n (1- (length mat))) + (i 1)) + (while (and (<= i n) + (math-ident-row-p (nth i mat) i a)) + (setq i (1+ i))) + (if (> i n) + a + nil)))) + +(defun math-ident-row-p (row n &optional a) + (unless a + (setq a 1)) + (and + (not (memq nil (mapcar + (lambda (x) (eq x 0)) + (nthcdr (1+ n) row)))) + (not (memq nil (mapcar + (lambda (x) (eq x 0)) + (butlast + (cdr row) + (- (length row) n))))) + (eq (elt row n) a))) + ;;; True if A is any scalar data object. [P x] (defun math-objectp (a) ; [Public] (or (integerp a) |