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1 #ifdef __MTX_C_SEEN__
2 /*
3 * mtx2: Ascend Sparse Matrix Package
4 * by Benjamin Andrew Allan
5 * Derived from mtx by Karl Michael Westerberg
6 * Created: 5/3/90
7 * Version: $Revision: 1.9 $
8 * Version control file: $RCSfile: mtx_use_only.h,v $
9 * Date last modified: $Date: 2000/01/25 02:27:13 $
10 * Last modified by: $Author: ballan $
11 *
12 * This file is part of the SLV solver.
13 *
14 * Copyright (C) 1996 Benjamin Andrew Allan
15 * based (loosely) on mtx
16 * Copyright (C) 1990 Karl Michael Westerberg
17 * Copyright (C) 1993 Joseph Zaher
18 * Copyright (C) 1994 Joseph Zaher, Benjamin Andrew Allan
19 * Copyright (C) 1995 Kirk Andre Abbott, Benjamin Andrew Allan
20 *
21 * The SLV solver is free software; you can redistribute
22 * it and/or modify it under the terms of the GNU General Public License as
23 * published by the Free Software Foundation; either version 2 of the
24 * License, or (at your option) any later version.
25 *
26 * The SLV solver is distributed in hope that it will be
27 * useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
28 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
29 * General Public License for more details.
30 *
31 * You should have received a copy of the GNU General Public License along with
32 * the program; if not, write to the Free Software Foundation, Inc., 675
33 * Mass Ave, Cambridge, MA 02139 USA. Check the file named COPYING.
34 * COPYING is found in ../compiler.
35 */
36 /*********************************************************************\
37 This file defines the private parts of an mtx and is only for mtx*.c
38 consumption. Any temptation to include this header in a linear or
39 nonlinear solver package is a symptom of extremely bad programming
40 and lack of proper task analysis. This header should be regarded as
41 highly unstable. We make ABSOLUTELY NO commitment to maintain
42 consistency between any two versions of this file.
43
44 Note to third parties:
45 mtx is PRODUCTION code in very long use at Carnegie Mellon University.
46 As such, we maintain a very tight hold of the internals of our data
47 structure so that we can easily prove the code when apparent bugs arise.
48 99.44% of "bugs" experienced in using mtx are the result of not
49 reading the public headers carefully.
50
51 The material in this file was never a part of any header until the
52 old mtx.c file got so big that we had to split it up to make it
53 manageable.
54
55 Note to future developers of the mtx module. If you change ANYTHING
56 in this file it is YOUR job to:
57 a) clear that change with all the other developers using this header
58 b) fix ALL the other mtx*.c files that depend on it.
59 If you are not willing to do that much work, why the hell are you
60 dabbling in sparse matrix math? go work on GUIs.
61 \*********************************************************************/
62 #ifndef __MTX_INTERNAL_USE_ONLY_H__
63 #define __MTX_INTERNAL_USE_ONLY_H__
64 /* requires #include <stdio.h> */
65 /* requires #include "mem.h" */
66 /* requires #include "mtx.h" */
67
68 #ifndef FALSE
69 /* these should have come in from base.h. */
70 #define FALSE 0
71 #define TRUE 1
72 #endif
73
74 #define MTX_DEBUG FALSE
75 /* MTX_DEBUG is a no holds barred sanity checking flag for use when
76 * nothing else is giving a clue why something is going wrong. It
77 * slows down the code to a crawl. Do not under any conditions change
78 * its value or undefine it except at this location. If you need some
79 * other sort of debugging flag for debugging a particular function,
80 * use some personal debugging flag.
81 */
82
83 #define EVEN FALSE
84 #define ODD TRUE
85 #define SWAPS_PRESERVE_ORDER TRUE
86 /**
87 *** Do row and column swaps preserve the ordering of non-zeros in rows
88 *** and columns? Setting this to TRUE means swapping only entails the
89 *** movement of integer row or column numbers and NOT the exchange of
90 *** entire row or columns.
91 **/
92 #define WIDTHMAGIC 2048
93 #define LENMAGIC 10
94 /**
95 *** WIDTHMAGIC is the byte size to aim for in allocating groups of elements.
96 *** LENMAGIC initial # of groups of elements, hence the smallest
97 *** possible number of elements a matrix will ever have is LENM*WIDTHM/eltsize.
98 **/
99
100 extern FILE *g_mtxerr;
101 /**
102 *** Global file pointer to which errors are reported. Should never be
103 *** NULL. Also useful when running ascend in gdb and you can't find
104 *** any other file pointer to use.
105 **/
106
107 struct next_element_t {
108 struct element_t *row;
109 struct element_t *col;
110 };
111 /* just a struct to make resulting code more readable. */
112
113 struct element_t {
114 real64 value;
115 int32 row;
116 int32 col;
117 struct next_element_t next;
118 };
119 /**
120 *** This is the basic jacobian element of an mtx.
121 *** It's size is 24 bytes on 4 byte pointer machines and
122 *** 32 bytes on 8 byte pointer machines.
123 *** The elements form a bidirectional singly linked list.
124 *** The row and col indices in an element refer back to
125 *** the header positions of the two lists that element is in.
126 *** That is, each element knows its orgrow and orgcol.
127 **/
128
129 struct nz_headers_t {
130 struct element_t **row;
131 struct element_t **col;
132 };
133 /**
134 *** Each matrix is really just a pair of arrays of pointers to
135 *** elements. The index of a row or column in THESE arrays is
136 *** what is referred to as an org index. A value of NULL in
137 *** either array means that that row (or col) is empty.
138 ***
139 *** When we insert elements in the matrix, we simply shove the
140 *** element in at the head of the its row/column lists.
141 *** When we delete an element in the matrix, we search in one
142 *** direction and unlink the element, marking it "dead". Then a
143 *** general pass in the other direction unlinks all the "dead"
144 *** elements.
145 ***
146 *** Special note: The -1th element of nz_header arrays is NOT allocated.
147 **/
148
149 struct permutation_t {
150 int32 *org_to_cur; /* org_to_cur[-1] = -1 */
151 int32 *cur_to_org; /* cur_to_org[-1] = -1 */
152 boolean parity;
153 };
154 /**
155 *** We maintain, rather than rederiving, the information required to
156 *** answer all possible permutation questions.
157 *** This is a policy decision based on the fact that mtx is research
158 *** code that needs maximal flexibility at reasonable speed.
159 ***
160 *** The -1th element of org_to_cur and cur_to_org are defined because
161 *** -1 is used all over mtx as an error return. It's easier to debug
162 *** things without the memory access errors that would happen if
163 *** -1 were not allocated or were part of memory in some other object.
164 ***
165 *** Special note: The -1th element of nz_header arrays is NOT allocated.
166 **/
167
168 /* Do not access the parity field of a slave matrix, refer to its master. */
169 /* Conduct all permuting operations on the master. */
170
171 struct permutations_t {
172 struct permutation_t row;
173 struct permutation_t col;
174 int32 transpose;
175 };
176
177 struct structural_data_t {
178 int32 symbolic_rank; /* Symbolic rank (< 0 if invalid) */
179 int32 nblocks; /* # blocks in matrix */
180 mtx_region_t *block; /* Pointer to array of blocks */
181 };
182 /**
183 *** There is a list of blocks associated with a matrix.
184 *** This is an artifact of POOR solver API design between
185 *** Peter Piela and Karl Westerberg. The blockwise decomposition
186 *** information properly belongs to a linear or nonlinear solver
187 *** and not to the mtx.
188 ***
189 *** We intend to fix this soon.
190 **/
191
192 struct mtx_header {
193 int integrity; /* Integrity integer */
194 int32 order; /* Order of the matrix */
195 int32 capacity; /* Capacity of all the arrays */
196 int32 nslaves; /* number of slave matrices */
197 struct nz_headers_t hdr; /* Non-zero headers of the matrix */
198 struct element_t *last_value; /* value/set_value memory */
199 mem_store_t ms; /* element cache memory */
200 struct permutations_t perm; /* Permutation vectors */
201 struct structural_data_t *data; /* Pointer to structural information */
202 mtx_matrix_t master; /* the master of this mtx, if slave */
203 mtx_matrix_t *slaves; /* array of slave matrices */
204 };
205 /**
206 *** capacity may be > order.
207 *** A matrix of capacity 0 doesn't have a mem_store_t yet and elements
208 *** cannot be queried about without a core dump.
209 **/
210
211 struct mtx_block_perm_structure {
212 int integrity;
213 int32 order; /* Order of the matrix */
214 int32 capacity; /* Capacity of all the arrays */
215 mtx_matrix_t mtx; /* matrix of origin */
216 struct permutations_t perm; /* Permutation vectors */
217 struct structural_data_t *data; /* Pointers to structural information */
218 };
219 /**
220 *** If you want to save a permutation for restoration, you
221 *** have to make a copy of that data, eh? Here's the place you
222 *** put it. Note that the block list should be disappearing from
223 *** from the structural data soon.
224 **/
225
226
227 #define OK ((int)201539237)
228 #define DESTROYED ((int)531503871)
229 /* matrix integrity values. */
230
231 #define ZERO ((int32)0)
232 #define D_ZERO ((real64)0.0)
233 #define D_ONE ((real64)1.0)
234 /* useful constants if your C compiler is not too bright about ANSI */
235
236 #define ISSLAVE(m) ((m)->master!=NULL)
237 /**
238 *** Returns 1 if m is a slave matrix, 0 if not.
239 **/
240
241 #define ordered3(a,b,c) ((a) <= (b) && (b) <= (c))
242 #define in_range(rng,ndx) ordered3((rng)->low,ndx,(rng)->high)
243 #define legal(mtx,ndx) ordered3(ZERO,ndx,(mtx)->order-1)
244 /**
245 *** Boolean operators to compare a row or column
246 *** index with some specified range or the maximum
247 *** range of the matrix in which it is used.
248 **/
249
250 #define fast_in_range(l,h,i) ( ordered3(l,i,h) )
251 #define not_in_range(l,h,i) ( (i)<(l) || (i)>(h) )
252 /**
253 *** Boolean operators to compare 3 integers.
254 *** l <= h must be TRUE or these will lie. In many cases,
255 *** this condition can (or should) be met before in_range
256 *** is called. Sometimes these are not faster since the lo,hi vals cost.
257 *** In particular, queries like next_col do not profit while calls
258 *** which must traverse an entire row/col do.
259 *** Gains in cycle count on dec alphas+cc are about 10% per function,
260 *** but the gains in time are more like 1%, so alpha pixie is lying a little.
261 *** For compilers which are not as clever as Decs, (gcc, sun acc) the
262 *** gains should be much more visible. (some do not realize rng->low
263 *** is invariant even with -O.)
264 *** Note that these are 'loose' comparisons if !(l<=h)
265 **/
266
267 #define zero(ptr,nelts,type) \
268 mem_zero_byte_cast((ptr),0,(nelts)*sizeof(type))
269 /**
270 *** Zeros a vector of specified length and type.
271 *** It is inefficient to use, however, if you know the type
272 *** is one of the basic types (int,double,ptr,char)
273 **/
274
275
276 /**************************************************************************\
277 Private check routines
278 \**************************************************************************/
279 extern int super_check_matrix(mtx_matrix_t);
280 /**
281 *** After somevery extensive checking, returns an error count.
282 *** More or less assume MTX_DEBUG is TRUE, and that is the only
283 *** condition under which this should be called.
284 **/
285
286
287 /**************************************************************************\
288 Element CREATE/find routines. Please try to confine use of these to
289 mtx_basic.c as much as possible.
290 Use of find should be avoided at all costs, and in particular
291 absolutely noone outside mtx should put their fingers on elements.
292
293 These functions are not exported to generic users because they are
294 on the critical path and we cannot afford the sanity checking required.
295 They should only be called in contexts where the arguments are
296 guaranteed valid.
297 \**************************************************************************/
298
299 struct element_t *mtx_find_element( mtx_matrix_t, int32, int32);
300 /**
301 *** mtx_find_element(mtx,org_row,org_col)
302 *** mtx_matrix_t mtx;
303 *** int32 org_row;
304 *** int32 org_col;
305 ***
306 *** Searches for a given element of the matrix and returns a pointer to it
307 *** if it exists, or NULL if it doesn't exist.
308 *** It is *ASSUMED* that org_row
309 *** and org_col are legal indices. May crash if they are not.
310 **/
311
312 struct element_t *mtx_create_element( mtx_matrix_t, int32, int32);
313 /**
314 *** mtx_create_element(mtx,org_row,org_col);
315 *** mtx_matrix_t mtx;
316 *** int32 org_row;
317 *** int32 org_col;
318 *** Creates the given element and returns a pointer to it. The value is
319 *** initially zero.
320 *** It is *ASSUMED* that org_row
321 *** and org_col are legal indices. May crash if they are not.
322 *** If mtx_DEBUG is TRUE, then we will whine if the element already
323 *** exists, but go ahead and create it anyway.
324 **/
325
326 struct element_t *mtx_create_element_value(mtx_matrix_t, int32,
327 int32,real64);
328 /**
329 *** mtx_create_element_value(mtx,org_row,org_col,val);
330 *** mtx_matrix_t mtx;
331 *** int32 org_row;
332 *** int32 org_col;
333 *** real64 val;
334 *** Creates the given element and returns a pointer to it. The value is
335 *** initialzed to val.
336 *** It is *ASSUMED* that org_row
337 *** and org_col are legal indices. May crash if they are not.
338 *** If mtx_DEBUG is TRUE, then we will whine if the element already
339 *** exists, but go ahead and create it anyway.
340 **/
341
342 /**************************************************************************\
343 Element list traversals. No linear algebra programmer with an ounce of
344 intelligence would ever need to use these in critical path functions.
345 \**************************************************************************/
346 extern struct element_t *mtx_next_col(register struct element_t *,
347 mtx_range_t *, int32 *);
348 /**
349 *** enext = struct element_t *mtx_next_col(elt,rng,tocur);
350 *** struct element_t *elt, *enext;
351 *** mtx_range_t *rng;
352 *** int32 *tocur;
353 ***
354 *** Returns the next element after elt that is in the range
355 *** rng according to the permutation vector tocur given. May return NULL.
356 **/
357
358 extern struct element_t *mtx_next_row(register struct element_t *,
359 mtx_range_t *, int32 *);
360 /**
361 *** enext = struct element_t *mtx_next_row(elt,rng,tocur);
362 *** struct element_t *elt, *enext;
363 *** mtx_range_t *rng;
364 *** int32 *tocur;
365 ***
366 *** Returns the next element after elt that is in the range
367 *** rng according to the permutation vector tocur given. May return NULL.
368 **/
369
370 /**************************************************************************\
371 Permutation memory management.
372 \**************************************************************************/
373 extern int32 *mtx_alloc_perm(int32);
374 /**
375 *** p = mtx_alloc_perm(cap);
376 *** int32 cap, *p;
377 *** Allocates a permutation vector. The user need
378 *** not concern himself with the -1st element, which does exist.
379 **/
380
381 extern void mtx_copy_perm(int32 *, int32 *, int32);
382 /**
383 *** mtx_copy_perm(tarperm,srcperm,cap)
384 *** int32 *tarperm;
385 *** int32 *srcperm;
386 *** int32 cap;
387 *** Copies srcperm to tarperm given the capacity of srcperm.
388 *** If tarperm was obtained from alloc_perm(), the -1 has already been copied.
389 **/
390
391 extern void mtx_free_perm(int32 *);
392 /**
393 *** mtx_free_perm(perm);
394 *** int32 *perm;
395 **/
396
397 /**************************************************************************\
398 It is advantageous in an interactive system to introduce reusable
399 memory and monitor its integrity rather than to repeatedly allocate
400 and zero it. The following code accomplishes this for mtx.
401 A null_vector is an array of objects (size s, length n) with value 0.
402 This sort of memory management is needed because there is always the chance
403 that a floating point exception could cause premature return of an mtx
404 client. This way we have a safe place to store pointers to the memory
405 even if the user's algorithm loses them.
406 \**************************************************************************/
407
408 struct reusable_data_vector {
409 void *arr; /* pointer to array of objects size entrysize */
410 int capacity; /* number of object slots in array */
411 size_t entry_size; /* size of slots */
412 int last_line; /* line most recently associated with this structure,
413 should be 0 if the array is not in use. */
414 };
415
416 extern struct reusable_data_vector
417 g_mtx_null_index_data, /* bunch of int32 */
418 g_mtx_null_sum_data, /* bunch of mtx_value_t */
419 g_mtx_null_mark_data, /* bunch of char */
420 g_mtx_null_vector_data, /* bunch of element pointers */
421 g_mtx_null_col_vector_data, /* bunch of element pointers */
422 g_mtx_null_row_vector_data; /* bunch of element pointers */
423
424 /**
425 *** vec = mtx_null_vector(nptrs);
426 *** vec = mtx_null_col_vector(nptrs);
427 *** vec = mtx_null_row_vector(nptrs);
428 *** marks = mtx_null_mark(nchar);
429 *** sums = mtx_null_sum(nnums);
430 *** indexes = mtx_null_index(ninds);
431 ***
432 *** struct element_t **vec;
433 *** char *marks;
434 *** real64 *sums;
435 *** int32 *indexes;
436 *** int32 nptrs, nchar, nnums, ninds;
437 ***
438 *** Returns an array of chars, elt pointers, indexes or numbers all NULL/0.
439 *** We need these a lot, but seldom simultaneously, and we know generally
440 *** how to rezero them when done with them.
441 *** These functions should not be
442 *** called again until the vector is re-NULLED and out of use.
443 *** If we detect a double call, we will whine loudly, renull
444 *** the array ourselves, and give it to you again.
445 *** To avoid whining, call the corresponding release functions
446 *** each time you are done with one of these vectors.
447 ***
448 *** In the event of insufficient memory (alloc failed) we will
449 *** return NULL. If we return NULL, you needn't call the release function.
450 ***
451 *** mtx_null_vector_release();
452 *** mtx_null_col_vector_release();
453 *** mtx_null_row_vector_release();
454 *** mtx_null_mark_release();
455 *** mtx_null_sum_release();
456 *** mtx_null_index_release();
457 ***
458 *** These are a memory reuse promoter.
459 *** Calling with cap==0 frees any memory in use.
460 *** Clientlists -- PLEASE KEEP THIS UP TO DATE --
461 *** mtx_null_vector:
462 *** expand_row,expand_col, mtx_assemble
463 *** mtx_householder_transform
464 *** mtx_null_row_vector:
465 *** expand_row_series
466 *** mtx_null_col_vector:
467 *** expand_col_series
468 *** mtx_null_mark:
469 *** mtx_householder_transform
470 *** mtx_null_sum:
471 *** mtx_householder_transform
472 *** mtx_null_index:
473 *** mtx_householder_transform
474 **/
475 #define mtx_null_vector(c) \
476 ((struct element_t **)mtx_null_vector_f(c,__LINE__,__FILE__, \
477 &g_mtx_null_vector_data,"null_vector"))
478 #define mtx_null_row_vector(c) \
479 ((struct element_t **)mtx_null_vector_f(c,__LINE__,__FILE__, \
480 &g_mtx_null_row_vector_data,\
481 "null_row_vector"))
482 #define mtx_null_col_vector(c) \
483 ((struct element_t **)mtx_null_vector_f(c,__LINE__,__FILE__, \
484 &g_mtx_null_col_vector_data,\
485 "null_col_vector"))
486 #define mtx_null_mark(c) \
487 ((char *)mtx_null_vector_f(c,__LINE__,__FILE__, \
488 &g_mtx_null_mark_data,"null_mark"))
489 #define mtx_null_sum(c) \
490 ((real64 *)mtx_null_vector_f(c,__LINE__,__FILE__, \
491 &g_mtx_null_sum_data,"null_sum"))
492 #define mtx_null_index(c) \
493 ((int32 *)mtx_null_vector_f(c,__LINE__,__FILE__, \
494 &g_mtx_null_index_data,"null_index"))
495
496 #define mtx_null_vector_release() \
497 mtx_null_vector_release_f(__LINE__,__FILE__, \
498 &g_mtx_null_vector_data,"null_vector")
499 #define mtx_null_col_vector_release() \
500 mtx_null_vector_release_f(__LINE__,__FILE__, \
501 &g_mtx_null_col_vector_data,"null_col_vector")
502 #define mtx_null_row_vector_release() \
503 mtx_null_vector_release_f(__LINE__,__FILE__, \
504 &g_mtx_null_row_vector_data,"null_row_vector")
505 #define mtx_null_mark_release() \
506 mtx_null_vector_release_f(__LINE__,__FILE__, \
507 &g_mtx_null_mark_data,"null_mark")
508 #define mtx_null_sum_release() \
509 mtx_null_vector_release_f(__LINE__,__FILE__, \
510 &g_mtx_null_sum_data,"null_sum")
511 #define mtx_null_index_release() \
512 mtx_null_vector_release_f(__LINE__,__FILE__, \
513 &g_mtx_null_index_data,"null_index")
514
515 extern void *mtx_null_vector_f(int32, int, CONST char *,
516 struct reusable_data_vector *, char *);
517 /**
518 *** v = mtx_null_vector_f(cap,line,file, ptr,fn);
519 *** int32 cap;
520 *** int line;
521 *** CONST char *file;
522 *** struct reusable_data_vector *ptr;
523 *** char *fn;
524 ***
525 *** Returns a pointer to cap*ptr->entry_size bytes, which must be cast.
526 *** The memory pointed at is believed to be zero, and will be if the
527 *** user is properly rezeroing the vector before it is released.
528 *** If insufficient memory is available, this whines and returns NULL.
529 *** Calling this with cap==0 causes the reused memory to be deallocated and
530 *** returns NULL.
531 *** Call this only via the macros, please.
532 **/
533
534 extern void mtx_null_vector_release_f(int, CONST char *,
535 struct reusable_data_vector *, char *);
536 /**
537 *** mtx_null_vector_release_f(line,file,ptr,fn);
538 *** int line;
539 *** CONST char *file,
540 *** struct reusable_data_vector *ptr;
541 *** char *fn
542 ***
543 *** Marks a vector as not in use, or whines if it wasn't.
544 *** Does no other checking. Uses line, file and fn in error reporting.
545 *** Please use the macros to access this function.
546 **/
547
548 extern void mtx_reset_null_vectors(void);
549 /**
550 *** This resets the reusable arrays of zeroes to zero in the event
551 *** that they may have been corrupted.
552 **/
553
554 /*
555 ** INTERNAL element vector operations of some utility.
556 */
557
558 extern struct element_t **mtx_expand_row(mtx_matrix_t, int32);
559 /**
560 *** buf = mtx_expand_row(mtx,orgrow);
561 *** mtx_matrix_t mtx;
562 *** int32 orgrow;
563 *** struct element_t **buf;
564 ***
565 *** Expands the given row into an array of pointers, indexed on original
566 *** col number. The array is obtained from mtx_null_vector().
567 *** Be sure to call mtx_null_vector_release() when done with the vector and
568 *** you have rezeroed it.
569 *** You cannot call this twice without releasing first or call mtx_expand_col.
570 **/
571
572 extern struct element_t **mtx_expand_col(mtx_matrix_t, int32);
573 /**
574 *** buf = mtx_expand_col(mtx,orgcol);
575 *** mtx_matrix_t mtx;
576 *** int32 orgcol;
577 *** struct element_t **buf;
578 ***
579 *** Expands the given col into an array of pointers, indexed on original
580 *** row number. The array is obtained from mtx_null_vector().
581 *** Be sure to call mtx_null_vector_release() when done with the vector and
582 *** you have rezeroed it.
583 *** You cannot call this twice without releasing first or call mtx_expand_row.
584 **/
585
586 extern void mtx_renull_using_row(mtx_matrix_t, int32,
587 struct element_t **);
588 /**
589 *** mtx_renull_using_row(mtx,orgrow,arr)
590 *** mtx_matrix_t mtx;
591 *** int32 orgrow;
592 *** struct element_t **arr;
593 ***
594 *** Makes arr NULLed again, assuming that the only non-NULL elements
595 *** must correspond to original col numbers that exist in the given
596 *** orgrow.
597 **/
598
599 extern void mtx_renull_using_col(mtx_matrix_t, int32,
600 struct element_t **);
601 /**
602 *** mtx_renull_using_row(mtx,orgcol,arr);
603 *** mtx_matrix_t mtx;
604 *** int32 orgcol;
605 *** struct element_t **arr;
606 ***
607 *** Makes arr NULLed again, assuming that the only non-NULL elements
608 *** must correspond to original row numbers that exist in the given
609 *** orgcol.
610 **/
611
612 extern void mtx_renull_all(mtx_matrix_t, struct element_t **);
613 /**
614 *** mtx_renull_all(mtx,arr);
615 *** mtx_matrix_t mtx;
616 *** struct element_t **arr;
617 ***
618 *** Makes arr NULLed again, assuming it is size mtx->order.
619 ***
620 **/
621
622 #endif /* __MTX_INTERNAL_USE_ONLY_H__ */
623 #endif /* none of your business if you aren't mtx_*.c */

john.pye@anu.edu.au
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