Ripser 1.2.1

Maintenance release.

• Fixed a bug, ensuring the use of sparse distance matrices also for point clouds when a threshold is used.

Ripser 1.2

Major update.

• Improved performance by avoiding storage of apparent pairs in pivot hash table.
• Support for robin_hood hash map.

Ripser 1.1

Major update.

• Support for sparse distance matrices.
• Support for input in sparse triplet format.
• Support for binary file format.
• Code refactoring at various places.
• Changed license to MIT.
• Disabled oblivious reduction, always using reduction matrix to improve performance on difficult problem instances.
• Added a command line option to specify minimum death/birth ratio of output persistence pairs.

Ripser 1.0.1

Maintenance release.

• Support for point clouds.
• Dynamic input format selection, with option for reading from stdin.
• Fixes to the file reader.
• Using Kruskal's algorithm and union-find for barcodes in dimension 0.
• Improved memory usage for computation with coefficients, by packing simplex index and coefficient into one 64 bit word.

Ripser 1.0

First public release of Ripser.

Software presented at ATMCS7, Torino, July 25–29, 2016.