================= cddlib Change Log ================= .. current developments v0.94m ==================== **Fixed:** * Fix and error, where a non-redundant linearity could be considered redundant. * Fix an optimization error in ViaShooting code so that the linear programs are now much smaller. * Fixed memory leaks in the redundancy code. * Updated version number in dd_DDVERSION define. v0.94l ==================== **Fixed:** * `extern C` block in cdd.h header for C++ (thanks to @jengelh) v0.94k ==================== - header files are now installed to PREFIX/include/cddlib to avoid clashes with other libraries. - configuration file for pkg-config added: assuming cddlib installed in <prefix> known to pkg-config, "pkg-config --cflags cddlib" etc will work. (Otherwise, one would need PKG_CONFIG_PATH=<prefix>/lib/pkgconfig). v0.94jg ==================== - Thanks to Julian Rüth, modernized autotooling, mirrored code on GitHub, introduced cddexec as a replacement of cdd_both_reps that many distributions packaged, made randomization portable. Thanks to Matthias C. M. Troffaes, fixed representation type in dd_MatrixAppendTo. v094ig ==================== - The missing definition of dd_set_d function in the case of -DGMPRATIONAL flag is used. The only change is in cddmp.h. The use of this function is explained in testcdd2.c program. This function is useful when input is mostly float (real). Even such a case, running on the rational exact arithmetic might be helpful to debug the floating point computation. v094hg ==================== - Thanks to Mathieu Dutour, one minor bug has been fixed. v094gg ==================== - Thanks to both Anders Jensen and Mathieu Dutour a few memory leaks in cddlib.c and cddlp.c have been fixed. Also, some patches sent by Jerry James have been applied. These were for making the library shared and more compatible for C++ compilers. v094fg ==================== - Thanks to Sven Verdoolaege's fixes, the "configure" script now uses "gcc" as the default compiler, rather than "g++" in earlier releases, and the libraries can be linked properly with both C and C++ programs. v094eg ==================== - A bug of reporting a wrong (sign) certificate of an infeasible LP is fixed. This bug reported by Charles Geyer, occurs if the exact GMP version of the dd_LPSolve is used with minimization. A bug of reporting infeasibility of a feasible LP with column non-full rank LP is fixed. This bug was reported by Sven Verdoolaege. v094dg ==================== - A bug of reporting a wrong unbounded direction vector of a dual inconsistent LP is fixed. This bug occurs only if the exact GMP version of the dd_LPSolve is used. For example, this error may occur in scdd_gmp. This error was reported by Lars Schewe. v094cg ==================== - A bug for reading a rational number of length longer than 255 characters have been fixed. This was reported by Ruriko Yoshida. Now the longest number is controlled by dd_wordlenmax defined in cddtypes.h . The longest line is also controlled by dd_linelenmax . These are currently fixed to 1024 and 4096. Larger numbers and lines can be handled by modifying these numbers and recompilation. v094bg ==================== - A bug for the representation conversion, reported by Michal Kvasnica, was fixed. The earlier 094* versions prematurely terminate the conversion when the number of rows is equal to the number of columns in the input. This means the earlier 094* do not compute correctly for simplices, for example. v094ag ==================== - A bug of dd_LPSolve is fixed. This bug, reported by Dima Pasechnik, due to a mishandling of cycling of LP algorithms, is fixed. v094g ==================== - dd_MatrixCanonicalize has been added. This reduces matrix M to a minimal representation by computing all implicit linearity rows and all redundant rows. It applies lexicographic sorting of rows to remove duplicates before applying redundancy removal. This function combines the two computations together in more efficient manner than before. See the new redcheck.c for its use. Several basic operations for matrices have been added, such as dd_MatrixRowsRemove and dd_MatrixRowsRemove2. The representation conversion dd_DDMatrix2Poly now handles the empty H-polyhedra properly, by calling an LP-based emptiness checker before running the double description algorithm. New functions finding specific points in H-polyhedra are added. dd_ExistsRestrictedFace is a general inequality system solver with specified equations, inequalities and strict inequalities. dd_FindRelativeInterior finds a point in the relative interior of a polyhedron. v093dg ==================== - The problem of outputting the running log has been corrected. This problem and a solution was communicated by Charles Geyer. Now, a new global dd_boolean variable dd_log (= dd_FALSE by default) controls log output. An scdd/lcdd bug of terminating with segmentation fault when an input polyhedron is numerically delicate has been corrected. This bug was reported by Stefan Volkwein. v093cg ==================== - A bug of Phase I of the dual simplex method in floating-point arithmetics is fixed. The problem (bus error) occurred when input data is not appropriate for floating-point arithmetics. The problem occurrs even for the GMP executables as the exact LP solver first tries to detect the terminal basis with float-point arithmetics. v093bg ==================== - The nonterminating problem of the LP solver has been fixed. This was due to a cycling of the criss-cross method in floating-point arithmetics, that is extremely rare. Also, the phase I of the dual simplex method has been modified. The auxiliary LP is perhaps less likely to be degenerate. v093ag ==================== - The LP basis finding procedure dd_FindLPBasis2 has been updated. The functions dd_Matrix2WeakAdjacency, dd_SRedundant and dd_SRedundantRows are added. The manual has been updated. v093g ==================== - dd_LPSolve with GMP now runs fisrt with floating point arithmetics and checks with GMP the correctness of the result. New functions dd_Matrix2Adjacency, dd_FourierElimination, dd_BlockElimination, dd_DDMatrix2Poly2 are added. Some minor memory leak problems are fixed. (Thanks to the excellent memory debugger valgrind on linux.) v092bg ==================== - An illegal memory access for EqualityIndex reported by Thao Dang is fixed. Another bug of lcdd_gmp which takes "real" data and return a false result is fixed. It now warns that input is not correct for the exact arithmetic lcdd_gmp. This error was reported by Andras Salamon. v092ag ==================== - Joerg Rambau kindly created an autoconf distribution of cddlib-092. This version 092a is made from Rambau's version with a slight modification. For the momoment, the Mathematica cdd interface, cddmathlink (in src-mathlink), still needs to be handled in the conventional manner by editing Makefile. v092g ==================== - the default value of dd_almostzero is now set to 1.0E-7 instead of 1.0E-6. New functions are added for checking redundancy of H- and V- representations such as dd_Redundant, dd_RedundantRows, dd_ImplicitLinearity, dd_ImplicitLinearityRows, and dd_RayShooting. Also some basic operations on dd_MatrixPtr have been added such as dd_MatrixAppendTo, dd_MatrixRowRemove, dd_MatrixSubmatrix. The names of enumeration type variables have been modified. Now all names have prefix "dd_", e.g. Rational, Integer are now dd_Rational and dd_Integer. This applies to TRUE and FALSE, which are now dd_TRUE and dd_FALSE. v091dg ==================== - Memory leak in dd_FreeLPData and dd_FreeLPSolution are fixed. v091cg ==================== - Bug to terminate before the completion of computation (to produce a segmentation fault) is fixed. This bug was reported by Hugh Anderson. v091bg ==================== - Numerous memory leak bugs with GMP exact arithmetic, reported by Marc Pfetsch, are fixed. Also, a minor bug of cddlib to terminate with core dump, reported by Hugh Anderson, is fixed. The messages printed to the standard output "stdout" are now sent to "stderr". This was suggested by Ingo Schurr. v091ag ==================== - Memory leak problems when GMP is used are fixed for dd_InitializeAmatrix, dd_CreateMatrix and dd_Larger. These bugs, reported by Marc Pfetsch, can be fatal if GMP is used and the functions are called many times. It has no effect for floating-point arithmetic computation. v091g ==================== - Memory leak in FreeDDMemory (cddcore.c) is fixed. This bug, which might cause a serious problem, was reported by Shawn Rusaw. Also, a bug reported by Istvan Csabai on dynamic row ordering is fixed. This problem is most likely not affecting anyone, since the dynamic row ordering option is not available via the publicly released documentations. David Avis contributed a sample cddlib code, lcdd.c, which runs like his convex hull code, lrs. In particular, it is useful to generate standard output stream for piping in unix. v090eg ==================== - A bug of reading very large integer values incorrectly is fixed. The previous versions were truncating very large integer values to a number representable by long integer. v090dg ==================== - Serious bugs of dd_CopyOutput, dd_CopyInequalities are fixed. This bug is found by Istvan Csabai. Earlier versions 090* output wrong H-representations whenever the RHS constants are not nonnegative, even though the computation runs correctly internally. v090cg ==================== - set_intialize is modified so that it allocates a smallest space even when a nonpositive length is requested. The bug of not outputting the origin is fixed when input is homogeneous inequality system and the cone contains no extreme rays. Note that cddlib does not output this vertex when the homogeneous cone has extreme rays, since cddlib outputs a minimal representation. - A new function dd_DDInputAppend is added. - dd_DDMatrix2Poly replaces (and combines) the two old functions dd_Matrix2Poly and dd_DoubleDescription. - dd_LPSolutionLoad is renamed as dd_CopyLPSolution. v090bg ==================== - Thanks to Shawn Rusaw's great help, I could detect and fix many memory related problems (memory leak, out-of-bounds, etc). Also, when input is not regular (nonfull or containing line), cddlib did not generate adjacency/incidence properly and this version should work more correctly. v090ag ==================== - a small bug fix in cddarith.c. The bug is reported by Shawn Rusaw. v090g ==================== - Major revision over the previous versions. It can be now compiled with GMP rational (-DGMPRATIONAL) as well as the standard C double. cdd and lp codes are merged and easily called together. Many functions and data types are modified and renamed. It comes with a simple cdd/cdd+-type standalne program scdd which does the standard representation conversion (*.ine <-> *.ext) and outputs all four types of auxiliary files (*.icd, *.iad, *.ecd, *ead). Although it lacks some functions such as preprojection of cdd+, scdd is potentially the most powerful cdd ever since it runs in the two arithmetics and it can handle any input. Because of the better readability and the overhead of employing function calls to do GMP arithmetic, the speed is little slower than cdd+-076 on both arithmetics C double and GMP rational. v086g ==================== - A bug fixed in dd_LexSmaller that affercted the lexicographic ordering of input data. This fix is essential for efficiency. Also several memory leaks have been fixed. Many of these bugs were found by Mr. Masanori Sato of Tokyo Institute of Technology. Never released. v085g ==================== - It can read rational data. Several minor bugs have been fixed. The new makefile creates cdd and dplex library archives libcdd.a and libdplex.a for unix systems. v080g ==================== - The first C-library version of cdd. It is stilll very primitive and has no documentation. See README.libcdd. Unlike the existing versions of cdd/cdd+, cddlib can deal with essentially any input, namely, non-full-dimensional convex hull problems and vertex-free extreme point (i.e. generator) listing problems. Also it comes with MathLink program cddmathlink that can be called from Mathematica to perform cdd operations.
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