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• Bear version 0.9.7 released

  Bear is a mathematical research tool for studying complex projective structures on punctured tori and for creating images of Bers slices of quasi-Fuchsian space. This release incorporates bug fixes, code improvements, and a new module for computing McShane-type sums over the tree of Markov triples. Bear is available as a source package or as a binary DEB for Debian GNU/Linux on i386. Full details about this release can be found in the release Change Log. A gallery of images and animations created with Bear is available on the author's web page: http://www.math.brown.edu/~ddumas/bear/

  posted by daviddumas 737 days ago

• File released: /bear/0.9.7/bear_0.9.7-1_i386.deb

  posted 738 days ago

• File released: /bear/0.9.7/bear-0.9.7.tar.gz

  posted 738 days ago

• bear 0.9.7 file released: bear-0.9.7.tar.gz

  2007-12-31 David Dumas <daviddumas@gmail.com> * bear 0.9.7 2007-05-28 David Dumas <daviddumas@gmail.com> * src/bear/linear.c: Include string.h, since memcpy is used here. * src/bear/interp_trace.c (it_alloc): Cast to gsl_interp_type to eliminate warning about discarding const qualifier. * src/bear/heun_gsl.c (heun_gsl_jacobian): Fix two-dimensional array subscripting. Now manually compute offset as 4*i+j. * src/bear/anosov.c: Include string.h, since memcpy is used here. (find_fixed): Add function pointer casts to prevent warning. * doc/bear-ref.tex: Extensive updates to describe changes and new features since 0.9.6 release * src/bear/mtsum.h: remove comments that incorrectly mention discreteness module, rather than mtsum (left over from conversion) * src/bear/lua_def.c (bear_lua_h5write_holonomy): report correct module name in error messages (holonomy, not h5holonomy) * src/bear/h5pathspec.c: add comments describing parse routines (h5ps_dataset_name): fix h5ps_dataset_name so it operates on its parameter, rather than an uninitialized pointer * src/bear/lua_def.c (bear_lua_bowditch): fix segfault on call to bowditch.run when there is no holonomy data available (check for null pointer) AND corresponding changes to mtsum, h5holonomy. * src/bear/bers2.c (bers2): do not print status line in quiet mode; also fix dereferencing of an uninitialized pointer in that case. 2007-02-11 David Dumas <daviddumas@gmail.com> * src/bear/schwarz.c: check for failed contour driver hash; fixes segfault when the string passed in the control structure is invalid. 2006-05-24 David Dumas <daviddumas@gmail.com> * src/bear/mtsum.c (mtsum): Add comments. 2005-09-19 David Dumas <daviddumas@gmail.com> * bear: added routines to register mtsum and scalar namespaces with lua. * bear: h5scalar.c, h5scalar.h add module to write an array of doubles to an HDF5 data file. * bear: mtsumi.c, mtsumi.h created to iterate the routine from mtsum over the elements of a holonomy arrary as produced by bers, bers2 * bear: added mtsum.c, mtsum.h, providing framework for summing the values of a function over the nodes of the Markov tree * bear: debug statements from h5discreteness-related functions in lua_def.c now contain correct function names.

  posted 738 days ago

• bear 0.9.7 file released: bear_0.9.7-1_i386.deb

  2007-12-31 David Dumas <daviddumas@gmail.com> * bear 0.9.7 2007-05-28 David Dumas <daviddumas@gmail.com> * src/bear/linear.c: Include string.h, since memcpy is used here. * src/bear/interp_trace.c (it_alloc): Cast to gsl_interp_type to eliminate warning about discarding const qualifier. * src/bear/heun_gsl.c (heun_gsl_jacobian): Fix two-dimensional array subscripting. Now manually compute offset as 4*i+j. * src/bear/anosov.c: Include string.h, since memcpy is used here. (find_fixed): Add function pointer casts to prevent warning. * doc/bear-ref.tex: Extensive updates to describe changes and new features since 0.9.6 release * src/bear/mtsum.h: remove comments that incorrectly mention discreteness module, rather than mtsum (left over from conversion) * src/bear/lua_def.c (bear_lua_h5write_holonomy): report correct module name in error messages (holonomy, not h5holonomy) * src/bear/h5pathspec.c: add comments describing parse routines (h5ps_dataset_name): fix h5ps_dataset_name so it operates on its parameter, rather than an uninitialized pointer * src/bear/lua_def.c (bear_lua_bowditch): fix segfault on call to bowditch.run when there is no holonomy data available (check for null pointer) AND corresponding changes to mtsum, h5holonomy. * src/bear/bers2.c (bers2): do not print status line in quiet mode; also fix dereferencing of an uninitialized pointer in that case. 2007-02-11 David Dumas <daviddumas@gmail.com> * src/bear/schwarz.c: check for failed contour driver hash; fixes segfault when the string passed in the control structure is invalid. 2006-05-24 David Dumas <daviddumas@gmail.com> * src/bear/mtsum.c (mtsum): Add comments. 2005-09-19 David Dumas <daviddumas@gmail.com> * bear: added routines to register mtsum and scalar namespaces with lua. * bear: h5scalar.c, h5scalar.h add module to write an array of doubles to an HDF5 data file. * bear: mtsumi.c, mtsumi.h created to iterate the routine from mtsum over the elements of a holonomy arrary as produced by bers, bers2 * bear: added mtsum.c, mtsum.h, providing framework for summing the values of a function over the nodes of the Markov tree * bear: debug statements from h5discreteness-related functions in lua_def.c now contain correct function names.

  posted 738 days ago

• File released: /bear/0.9.6/bear_0.9.6-2_i386.deb

  posted 1410 days ago

• File released: /bear/0.9.6/bear_0.9.6-2_amd64.deb

  posted 1410 days ago

• bear 0.9.6 file released: bear_0.9.6-2_i386.deb

  2005-08-13 David Dumas <daviddumas@gmail.com> * bear 0.9.6. * bear.1: man pages are now installed correctly. Previously they were ignored on 'make install'. * doc: bear-ref.ps and bear-ref.pdf are now included in the source distribution by default, even though they can be regenerated from source. * configure.in: option to avoid building the reference manual (e.g. if LaTeX is not available) now works. Previously, it failed because of a missing Makefile target. * debian: merged the Debian dpkg control files with the main source tree so that others can more easily make their own packages. Minimal docs in README.dpkg. * bear.spec.fc2: added RPM spec file tailored to Fedora Core 2, where HDF5 has not been 'officially' packaged. Minimal docs in README.fc2. * bear.spec: added RPM spec file tailored to Fedora Core 2005-07-24 David Dumas <daviddumas@gmail.com> * bear: schwarz_pre_mt prototype changed in the contour API to remove the determinant parameter. * bear: Altered default progress reporting for bers2 module to decrease the amount of output. The progress is now reported at the end of a row whenever at least 255 calculations have been performed since the last update. * bear: Removed storage of holonomy determinants from the grid, grid interpolation, and trace interpolation code, since det(A)=1 for the holonomy matrices produced by bear. 2005-07-11 David Dumas <daviddumas@gmail.com> * bear 0.9.5. * bear: Removed the normalization of the trace in the markov.c which was a major source of numerical error. This normalization is not necessary because the holonomy of the Schwarzian system already lies in SL_2. This small change results in a many-fold improvement in the maximum radius over which Bers slice holonomy can be reliably computed. 2005-06-08 David Dumas <daviddumas@gmail.com> * bear 0.9.4. 2005-06-06 David Dumas <daviddumas@gmail.com> * configure.in: Made '--disable-lsode' the default behavior at configure time. This fixes build problems on some platforms, notably Solaris with the Sun Workshop compiler. Will investigate and perhaps re-enable by default for future release. 2005-06-04 David Dumas <daviddumas@gmail.com> * bear-ref: Added description of the slope parameter for the linear module, which has been around for some time but which was not previously documented. * bear-ref: Documented LSODE method addition and relprecision parameters for bers and bers2 modules. Minor changes to exposition in several parts. 2005-05-29 David Dumas <daviddumas@gmail.com> * bear: changed prototype for h5disc_typeconv so that 'nelmts' is either hsize_t or size_t depending upon the HDF5 library version (<= 1.6.2 and >= 1.6.3, respectively). Cleaned up other instances of hsize_t so that size_t is used wherever possible. * configure.in: check for the specific version of the HDF5 library by applying the preprocessor to the header file 'hdf5.h'; define H5_CONV_NELMTS_T to be the correct type for the 'nelmts' parameter to HDF5 type conversion functions, which changed between 1.6.2 and 1.6.3 releases. 2005-05-28 David Dumas <daviddumas@gmail.com> * bear: added 'compatibility' parameter to the discreteness and holonomy modules; if nonzero, HDF5 output will be written in a form readable by versions of HDF5 older than 1.6.0 (which don't understand shuffling). 2005-05-27 David Dumas <daviddumas@gmail.com> * configure.in: added options to disable internal compression and shuffling of HDF5 files, even if these features are available. (Command-line options '--without-hdf5-new' and '--without-hdf5-deflate'). * bear: wrapped use of HDF5 1.6 functions in conditionals to allow bear to compile with earlier versions (1.4 confirmed). This amounts to disabling the shuffle output filter. * configure.in: added explicit checks for H5Pset_shuffle and H5Pall_filters_avail functions in HDF5 library, as these were only added in release 1.6.0. * bear: schwarz solver is now aware that the LSODE solver may or may not be available, and acts accordingly. If not available, the 'lsode' solver type is treated as unknown. * configure.in: added '--disable-lsode' to remove all dependence on a FORTRAN compiler, and modified checks for F77 to be nonfatal when they fail. 2005-05-25 David Dumas <daviddumas@gmail.com> * configure.in: check for strerror in configure; fixes bug where on a system with no error.h but with strerror (e.g. Mac OS X), build would fail on redefinition of strerror and type conflicts for related constants. * libreplace: error.h wrapped in #ifdef so that no prototypes are defined unless configure determined a replacement error function to be necessary. * makefiles: replace '-lg2c' hack with portable autoconf substitution of $(FLIBS) to build an executable from both C and FORTRAN object files. * configure.in: check for working F77 compiler and the necessary libraries to link FORTRAN code into a C program; fail if not found * clsode: replaced inclusion of obsolete 'malloc.h' with 'stdlib.h' 2005-05-05 David Dumas <daviddumas@gmail.com> * bear: h5pathspec.c: fixed bug where an internal path beginning with '/' would lead to attempt to open a group with garbage as its name. Thus both "/path/file.h5:/group/dataset" as well as "/path/file.h5:group/dataset" are now acceptable. (The former caused an error up to now.) * bear: h5io_util.h: changed maximum depth of hdf5 internal path to 8, since I noticed that some of my own files have depth up to 6. 2005-05-02 David Dumas <daviddumas@gmail.com> * bear: Portability enhancements: early glibc used macros for some string functions, breaking the IFNDEF prototyping in several files. Necessary to build on Debian 2.2 (potato). * bear: added prototypes for some string functions missed in previous modifications to allow for missing "string.h". 2005-04-028 David Dumas <daviddumas@gmail.com> * bear: h5discreteness and h5holonomy now do name-conflict resolution so that data isn't lost if an attempt is made to write to an existing dataset. 2005-04-20 David Dumas <daviddumas@gmail.com> * bear: added LSODE differential equation driver, separating Heun solver into 'heun_gsl' and 'heun_lsode'; LSODE is built from fortran sources as a static library and linked in using a simple C wrapper from libwayne. 2005-04-13 David Dumas <daviddumas@gmail.com> * bear: added 'piecewise_linear_alt' contour driver which breaks one of the segments into two halves joined at the point closest to the singularities of phi(). This may allow smart ODE integrators to better judge the necessary step size, i.e. they catch a thin but tall "spike" in phi() that might otherwise go unnoticed. * bear: modified piecewise linear contour driver so that the segment passing closest to the singularities is first. * bear: big cleanup in the PL contour driver making use of changes to contour API. 2005-04-05 David Dumas <daviddumas@gmail.com> * bear: cleaned up contour driver API so that a contour is now a sequence of segments, and the driver must present a single contour function that takes a time value and segment index. This replaces the old method where a separate function pointer was needed for each segment. 2005-03-24 David Dumas <daviddumas@gmail.com> * bear 0.9.3. * bear: added anosov module for computing unstable manifolds of pseudo-anosov mapping classes. * bear: added pluggable integration contour API and new contour drivers "piecewise_linear", "ellipse", and "spline_ellipse". The latter is a rewrite of the integration contour system used in previous versions. * bear: added bers2 module which computes holonomy via interpolation from a sparse grid, yielding a speed improvement when the holonomy does not vary too quickly * bear: updated test suite * bear: print more detailed information during computations, and add a linebreak ('\n') after each status update for more dependable output buffer flushing and easier reading of log files. 2004-05-07 David Dumas <daviddumas@gmail.com> * bear 0.9.0. First sourceforge release. 2004-05-07 David Dumas <daviddumas@gmail.com> * bear: major rewrite of the I/O and scripting code. HDF5 is now the main file format, and the extension language Lua is incorporated for input scripting. There is now an interactive mode, which is invoked by default if STDIN is a tty and no input file is specified. * bear: dependence on "expat" removed; XML parsing is no longer necessary. * bear: the "dyadic iteration" experimental options have been removed for now, as they are difficult to interface with the new Lua scripting frontend. They were primarily created to facilitate the development of an interactive Bers slice drawing program, which must now be redesigned. * bear: errors and debugging messages are now reported using the functions from GNU "error.h". This file is replaced with a version packaged with bear in case it is not found on the host by the configure script. * bear: probably more changes than I can think of right now. Version 0.9.0 shares little more than core mathematical code with previous versions. 2003-11-02 David Dumas <daviddumas@gmail.com> * bear: time differences are now computed using POSIXly correct difftime(), rather than a type cast; times will now be reportly correctly on systems where time_t is not a scalar (if there are any such systems). * bear: sign of the third element of each markov triple is now chosen correctly; note that the discreteness algorithm does not depend upon this sign. * bear: verbose output mode now displays statistics on the use of adaptive precision modification * bear: added new adaptive precision modification algorithm, and associated options "--delta", "--adapt", "--adapt-divisor", "--adapt-persist". * bear: verbose output mode now displays ETA * bear: minor rearrangement of Heun diffeq and contour calculation functions yielding i386 speed enhancement. * bear: added self-test suite to Makefiles to catch common discrepancy-causing issues like IEEE rounding and "unsafe" floating-point optimization. * bear: added first draft of texinfo documentation 2003-10-24 David Dumas <daviddumas@gmail.com> * bear: added linear slice capability (option "--linear") * bear: added a new Jorgensen stability parameter J, where the Jorgensen test now checks |x| < J. Default value of 0.999 seems to improve accuracy near the limit of the differential equation integration code. * bear: obsoleted the "trace_tiny" parameter, and made several speed-related improvements to the Bowditch algorithm. * bear: modified the formula for the Bowditch function H(x) -- the new function should be sufficient for discreteness testing, even at small scales. 2003-10-11 David Dumas <daviddumas@gmail.com> * bear: rewrote integration contour setup code -- should now work correctly for any lambda such that there exists an ellipse containing 0 and lambda but not 1, and an ellipse containing 1 and lambda but not 0. (Previous code cut out for lambda within ball of radius approx 0.14 about 0 or 1.) * bear: implemented trace_tiny functionality, removed dependence on qsort function. * bear: fixed computation_time functionality, so that computation times longer than 38 minutes ( = POSIX clock() wraparound time ) are reported correctly. Time resolution is now 1 second. 2003-09-25 David Dumas <daviddumas@gmail.com> * bear: restored computation_time functionality. * bear: added xdf_name option and changed handling of existing output files; the newly created arrays are always the next siblings of the input array, if any, or are inserted at the beginning otherwise. * bear: completely rewrote the xdf input/output routines; bear now makes only a single pass through its input and output files, which is much faster than the previous "parse-to-memeory" system. REMOVED dependence on Scew. 2003-09-22 David Dumas <daviddumas@gmail.com> * bear: added stubs for future "--trace-tiny" and "--trace-huge" option functionality * bear: added "--maxdepth" option to control max depth of the discreteness tree search 2003-09-18 David Dumas <daviddumas@gmail.com> * claw: ripped out the old perl script and rewrote claw as a C program; the result is much faster but slightly less tolerant of XDF different than that produced by bear. * bear: added "--precision" option to control precision of the ODE solver. 2003-09-16 David Dumas <daviddumas@gmail.com> * claw.pl: added XDF api to the list of external dependencies in README; added corresponding checks to configure.in. 2003-09-08 David Dumas <daviddumas@gmail.com> * bear: initial version.

  posted 1410 days ago

• bear 0.9.6 file released: bear_0.9.6-2_amd64.deb

  2005-08-13 David Dumas <daviddumas@gmail.com> * bear 0.9.6. * bear.1: man pages are now installed correctly. Previously they were ignored on 'make install'. * doc: bear-ref.ps and bear-ref.pdf are now included in the source distribution by default, even though they can be regenerated from source. * configure.in: option to avoid building the reference manual (e.g. if LaTeX is not available) now works. Previously, it failed because of a missing Makefile target. * debian: merged the Debian dpkg control files with the main source tree so that others can more easily make their own packages. Minimal docs in README.dpkg. * bear.spec.fc2: added RPM spec file tailored to Fedora Core 2, where HDF5 has not been 'officially' packaged. Minimal docs in README.fc2. * bear.spec: added RPM spec file tailored to Fedora Core 2005-07-24 David Dumas <daviddumas@gmail.com> * bear: schwarz_pre_mt prototype changed in the contour API to remove the determinant parameter. * bear: Altered default progress reporting for bers2 module to decrease the amount of output. The progress is now reported at the end of a row whenever at least 255 calculations have been performed since the last update. * bear: Removed storage of holonomy determinants from the grid, grid interpolation, and trace interpolation code, since det(A)=1 for the holonomy matrices produced by bear. 2005-07-11 David Dumas <daviddumas@gmail.com> * bear 0.9.5. * bear: Removed the normalization of the trace in the markov.c which was a major source of numerical error. This normalization is not necessary because the holonomy of the Schwarzian system already lies in SL_2. This small change results in a many-fold improvement in the maximum radius over which Bers slice holonomy can be reliably computed. 2005-06-08 David Dumas <daviddumas@gmail.com> * bear 0.9.4. 2005-06-06 David Dumas <daviddumas@gmail.com> * configure.in: Made '--disable-lsode' the default behavior at configure time. This fixes build problems on some platforms, notably Solaris with the Sun Workshop compiler. Will investigate and perhaps re-enable by default for future release. 2005-06-04 David Dumas <daviddumas@gmail.com> * bear-ref: Added description of the slope parameter for the linear module, which has been around for some time but which was not previously documented. * bear-ref: Documented LSODE method addition and relprecision parameters for bers and bers2 modules. Minor changes to exposition in several parts. 2005-05-29 David Dumas <daviddumas@gmail.com> * bear: changed prototype for h5disc_typeconv so that 'nelmts' is either hsize_t or size_t depending upon the HDF5 library version (<= 1.6.2 and >= 1.6.3, respectively). Cleaned up other instances of hsize_t so that size_t is used wherever possible. * configure.in: check for the specific version of the HDF5 library by applying the preprocessor to the header file 'hdf5.h'; define H5_CONV_NELMTS_T to be the correct type for the 'nelmts' parameter to HDF5 type conversion functions, which changed between 1.6.2 and 1.6.3 releases. 2005-05-28 David Dumas <daviddumas@gmail.com> * bear: added 'compatibility' parameter to the discreteness and holonomy modules; if nonzero, HDF5 output will be written in a form readable by versions of HDF5 older than 1.6.0 (which don't understand shuffling). 2005-05-27 David Dumas <daviddumas@gmail.com> * configure.in: added options to disable internal compression and shuffling of HDF5 files, even if these features are available. (Command-line options '--without-hdf5-new' and '--without-hdf5-deflate'). * bear: wrapped use of HDF5 1.6 functions in conditionals to allow bear to compile with earlier versions (1.4 confirmed). This amounts to disabling the shuffle output filter. * configure.in: added explicit checks for H5Pset_shuffle and H5Pall_filters_avail functions in HDF5 library, as these were only added in release 1.6.0. * bear: schwarz solver is now aware that the LSODE solver may or may not be available, and acts accordingly. If not available, the 'lsode' solver type is treated as unknown. * configure.in: added '--disable-lsode' to remove all dependence on a FORTRAN compiler, and modified checks for F77 to be nonfatal when they fail. 2005-05-25 David Dumas <daviddumas@gmail.com> * configure.in: check for strerror in configure; fixes bug where on a system with no error.h but with strerror (e.g. Mac OS X), build would fail on redefinition of strerror and type conflicts for related constants. * libreplace: error.h wrapped in #ifdef so that no prototypes are defined unless configure determined a replacement error function to be necessary. * makefiles: replace '-lg2c' hack with portable autoconf substitution of $(FLIBS) to build an executable from both C and FORTRAN object files. * configure.in: check for working F77 compiler and the necessary libraries to link FORTRAN code into a C program; fail if not found * clsode: replaced inclusion of obsolete 'malloc.h' with 'stdlib.h' 2005-05-05 David Dumas <daviddumas@gmail.com> * bear: h5pathspec.c: fixed bug where an internal path beginning with '/' would lead to attempt to open a group with garbage as its name. Thus both "/path/file.h5:/group/dataset" as well as "/path/file.h5:group/dataset" are now acceptable. (The former caused an error up to now.) * bear: h5io_util.h: changed maximum depth of hdf5 internal path to 8, since I noticed that some of my own files have depth up to 6. 2005-05-02 David Dumas <daviddumas@gmail.com> * bear: Portability enhancements: early glibc used macros for some string functions, breaking the IFNDEF prototyping in several files. Necessary to build on Debian 2.2 (potato). * bear: added prototypes for some string functions missed in previous modifications to allow for missing "string.h". 2005-04-028 David Dumas <daviddumas@gmail.com> * bear: h5discreteness and h5holonomy now do name-conflict resolution so that data isn't lost if an attempt is made to write to an existing dataset. 2005-04-20 David Dumas <daviddumas@gmail.com> * bear: added LSODE differential equation driver, separating Heun solver into 'heun_gsl' and 'heun_lsode'; LSODE is built from fortran sources as a static library and linked in using a simple C wrapper from libwayne. 2005-04-13 David Dumas <daviddumas@gmail.com> * bear: added 'piecewise_linear_alt' contour driver which breaks one of the segments into two halves joined at the point closest to the singularities of phi(). This may allow smart ODE integrators to better judge the necessary step size, i.e. they catch a thin but tall "spike" in phi() that might otherwise go unnoticed. * bear: modified piecewise linear contour driver so that the segment passing closest to the singularities is first. * bear: big cleanup in the PL contour driver making use of changes to contour API. 2005-04-05 David Dumas <daviddumas@gmail.com> * bear: cleaned up contour driver API so that a contour is now a sequence of segments, and the driver must present a single contour function that takes a time value and segment index. This replaces the old method where a separate function pointer was needed for each segment. 2005-03-24 David Dumas <daviddumas@gmail.com> * bear 0.9.3. * bear: added anosov module for computing unstable manifolds of pseudo-anosov mapping classes. * bear: added pluggable integration contour API and new contour drivers "piecewise_linear", "ellipse", and "spline_ellipse". The latter is a rewrite of the integration contour system used in previous versions. * bear: added bers2 module which computes holonomy via interpolation from a sparse grid, yielding a speed improvement when the holonomy does not vary too quickly * bear: updated test suite * bear: print more detailed information during computations, and add a linebreak ('\n') after each status update for more dependable output buffer flushing and easier reading of log files. 2004-05-07 David Dumas <daviddumas@gmail.com> * bear 0.9.0. First sourceforge release. 2004-05-07 David Dumas <daviddumas@gmail.com> * bear: major rewrite of the I/O and scripting code. HDF5 is now the main file format, and the extension language Lua is incorporated for input scripting. There is now an interactive mode, which is invoked by default if STDIN is a tty and no input file is specified. * bear: dependence on "expat" removed; XML parsing is no longer necessary. * bear: the "dyadic iteration" experimental options have been removed for now, as they are difficult to interface with the new Lua scripting frontend. They were primarily created to facilitate the development of an interactive Bers slice drawing program, which must now be redesigned. * bear: errors and debugging messages are now reported using the functions from GNU "error.h". This file is replaced with a version packaged with bear in case it is not found on the host by the configure script. * bear: probably more changes than I can think of right now. Version 0.9.0 shares little more than core mathematical code with previous versions. 2003-11-02 David Dumas <daviddumas@gmail.com> * bear: time differences are now computed using POSIXly correct difftime(), rather than a type cast; times will now be reportly correctly on systems where time_t is not a scalar (if there are any such systems). * bear: sign of the third element of each markov triple is now chosen correctly; note that the discreteness algorithm does not depend upon this sign. * bear: verbose output mode now displays statistics on the use of adaptive precision modification * bear: added new adaptive precision modification algorithm, and associated options "--delta", "--adapt", "--adapt-divisor", "--adapt-persist". * bear: verbose output mode now displays ETA * bear: minor rearrangement of Heun diffeq and contour calculation functions yielding i386 speed enhancement. * bear: added self-test suite to Makefiles to catch common discrepancy-causing issues like IEEE rounding and "unsafe" floating-point optimization. * bear: added first draft of texinfo documentation 2003-10-24 David Dumas <daviddumas@gmail.com> * bear: added linear slice capability (option "--linear") * bear: added a new Jorgensen stability parameter J, where the Jorgensen test now checks |x| < J. Default value of 0.999 seems to improve accuracy near the limit of the differential equation integration code. * bear: obsoleted the "trace_tiny" parameter, and made several speed-related improvements to the Bowditch algorithm. * bear: modified the formula for the Bowditch function H(x) -- the new function should be sufficient for discreteness testing, even at small scales. 2003-10-11 David Dumas <daviddumas@gmail.com> * bear: rewrote integration contour setup code -- should now work correctly for any lambda such that there exists an ellipse containing 0 and lambda but not 1, and an ellipse containing 1 and lambda but not 0. (Previous code cut out for lambda within ball of radius approx 0.14 about 0 or 1.) * bear: implemented trace_tiny functionality, removed dependence on qsort function. * bear: fixed computation_time functionality, so that computation times longer than 38 minutes ( = POSIX clock() wraparound time ) are reported correctly. Time resolution is now 1 second. 2003-09-25 David Dumas <daviddumas@gmail.com> * bear: restored computation_time functionality. * bear: added xdf_name option and changed handling of existing output files; the newly created arrays are always the next siblings of the input array, if any, or are inserted at the beginning otherwise. * bear: completely rewrote the xdf input/output routines; bear now makes only a single pass through its input and output files, which is much faster than the previous "parse-to-memeory" system. REMOVED dependence on Scew. 2003-09-22 David Dumas <daviddumas@gmail.com> * bear: added stubs for future "--trace-tiny" and "--trace-huge" option functionality * bear: added "--maxdepth" option to control max depth of the discreteness tree search 2003-09-18 David Dumas <daviddumas@gmail.com> * claw: ripped out the old perl script and rewrote claw as a C program; the result is much faster but slightly less tolerant of XDF different than that produced by bear. * bear: added "--precision" option to control precision of the ODE solver. 2003-09-16 David Dumas <daviddumas@gmail.com> * claw.pl: added XDF api to the list of external dependencies in README; added corresponding checks to configure.in. 2003-09-08 David Dumas <daviddumas@gmail.com> * bear: initial version.

  posted 1410 days ago

• Bear version 0.9.6 released

  Bear is a mathematical research tool for studying Bers slices and complex projective structures on punctured tori. This is a bugfix release that includes further performance improvements resulting from the same issues addressed in the 0.9.5 bug fixes. This is also the first release of Bear which is available in RPM package format; packages for several popular i386 GNU/Linux distribtuions and a source RPM are included. Binary DEB packages for Debian GNU/Linux on i386 and AMD64 and for Ubuntu GNU/Linux on i386 are also available. Full details about this release can be found in the release Change Log. A gallery of images and animations created with Bear is available on the author's web page: http://www.math.brown.edu/~ddumas/bear/

  posted by daviddumas 1607 days ago