Some comments about auxiliary functions were added

src/sage-interface.lisp

@@ -8,18 +8,13 @@
 
 
 
-;;;; Chain complexes
-
+;;;;; Chain complexes ;;;;;
 
 
 (DEFVAR *ASCII-NUM-START* 48)
-
-
-
 (DEFVAR *ASCII-NUM-END* 57)
 
 
-
 (DEFUN ITOA (value)
   (if (not (integerp value)) (error "Wrong type"))
   (if (zerop value)
@@ -40,17 +35,15 @@
 	 (return (format nil "~{~a~}" (nreverse result))))))
 
 
-
 (DEFUN STRCAT (&rest strings) (apply 'concatenate 'string strings))
 
 
-
 (DEFMACRO GEN (num1 num2)
   `(read-from-string (strcat "G" (itoa ,num1) "G" (itoa ,num2))))
 
 
-
 (DEFUN KBASIS (schcm)
+#| It provides the slot :basis of the KenzoSimplicialSet obtained by applying the function 'KChainComplex' to 'schcm' |#
   (flet ((rslt (dim)
            (let ((pair (assoc dim schcm)))
              (if (null pair)
@@ -60,8 +53,8 @@
     (the basis #'rslt)))
 
 
-
 (DEFUN KDFFR (schcm)
+#| It provides the slot :intr-dffr of the KenzoSimplicialSet obtained by applying the function 'KChainComplex' to 'schcm' |#
   (flet ((frslt (dim gnr)
            (let* ((sep (1+ (position #\G (subseq (write-to-string gnr) 1))))
                   (dim_gnr (read-from-string (subseq (write-to-string gnr) 1 sep)))
@@ -83,8 +76,8 @@
     #'frslt))
 
 
-
 (DEFUN G-CMPR (GnGm1 GnGm2)
+#| It provides the slot :cmpr of the KenzoSimplicialSet obtained by applying the function 'KChainComplex' to 'schcm' |#
   (let* ((sep (1+ (position #\G (subseq (write-to-string GnGm1) 1))))
          (m1 (read-from-string (subseq (write-to-string GnGm1) (1+ sep))))
          (m2 (read-from-string (subseq (write-to-string GnGm2) (1+ sep)))))
@@ -97,8 +90,16 @@
              :greater)))))
 
 
+(DEFUN ENTRY (mat i j)
+#| It provides the entry in row 'i' and column 'j' of the matrice 'mat' |#
+  (let ((p (left (chercher-hor (baselig mat i) j))))
+    (if (= j (icol p))
+        (val p)
+      0)))
+
 
 (DEFUN CONVERTMATRICE (matrice)
+#| It converts a matrix of type matrice to an array |#
   (let* ((numfil (nlig matrice))
          (numcol (ncol matrice))
          (rslt (make-array (list numfil numcol) :initial-element 0)))
@@ -110,16 +111,8 @@
     rslt))
 
 
-
-(DEFUN ENTRY (mat i j)
-  (let ((p (left (chercher-hor (baselig mat i) j))))
-    (if (= j (icol p))
-        (val p)
-      0)))
-
-
-
 (DEFUN CHCM-MAT2 (chcm n)
+#| The same 'chcm-mat' function but it does not print on screen intermediate computations |#
   (declare
    (type chain-complex chcm)
    (type fixnum n))
@@ -153,41 +146,38 @@
        mat)))
 
 
-
 (DEFUN MAKE-ARRAY-TO-LISTS (array)
+#| It converts an array to a list formed by its rows |#
   (loop for i below (array-dimension array 0)
         collect (loop for j below (array-dimension array 1)
                       collect (aref array i j))))
 
 
-
 (DEFUN MAKE-ARRAY-FROM-LISTS (nrows ncols list)
+#| It constructs an array from a list formed by its rows |#
     (make-array (list nrows ncols) :initial-contents list))
 
 
-
 (DEFUN BASIS_AUX1 (kchcm dim)
     (basis kchcm dim))
 
 
-
 (DEFUN ORGN_AUX1 (kchcm)
     (orgn kchcm))
 
 
-
 (DEFUN DFFR_AUX1(kchcm dim cmbn_list)
+#| Differential of a comb with dimension 'dim' and 'cmbn_list' as its cmbn-list |#
     (let ((comb (cmbn dim)))
         (setf (cmbn-list comb) cmbn_list)
         (dffr kchcm comb)))
 
 
-
-;;;; Simplicial sets
-
+;;;;; SImplicial Sets ;;;;;
 
 
 (DEFUN BUILD-FINITE-SS2 (list)
+#| The same 'build-finite-ss' function but it does not check the face relations of the simplices in 'list' ('check-smst' omitted) |#
   (declare (list list))
   (let ((bspn (first list))
         (table (finite-ss-table list))
@@ -208,5 +198,17 @@
       rslt)))
 
 
+(DEFUN SFINITESIMPLICIALSET_AUX1 (finitess limit)
+#| It constructs a list (L0 L1 ... Lm), with m <= 'limit', where each list Lk is formed by lists of the form (S (a0 ... ak)), where each aj is a face of the k-simplex S |#
+  (let ((rslt NIL))
+    (do ((k 1 (1+ k))) ((> k limit))
+      (let ((dimk NIL))
+        (dolist (simplex (basis finitess k))
+          (let ((faces NIL))
+            (do ((i k (1- i))) ((< i 0))
+              (push (face finitess i k simplex) faces))
+            (push (cons simplex faces) dimk)))
+      (push dimk rslt)))
+    (reverse rslt)))