updated readme

1 files changed, 18 insertions, 10 deletions

diff --git a/README.md b/README.md
index 55c4ed6..a3fa958 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,7 @@
 # Ripser

 

 Copyright © 2015–2016 [Ulrich Bauer].

+
 

 ### Description

 

@@ -32,21 +33,23 @@ Ripser's efficiency is based on a few important concepts and principles:
 

 ### Version

 [Latest release][latest-release]: 1.0 (July 2016)

+
 

 ### Building

 

-Ripser requires a C++11 compiler.

+Ripser requires a C++11 compiler. Here is how to obtain, build, and run Ripser:

 

 ```sh

-$ git clone https://github.com/Ripser/ripser.git

-$ cd ripser

-$ make

-$ ./ripser examples/sphere_3_192.lower_distance_matrix

+git clone https://github.com/Ripser/ripser.git

+cd ripser

+make

+./ripser examples/sphere_3_192.lower_distance_matrix

 ```

+
 

 ### Options

 

-Ripser supports several compile-time options. They are switched on by defining the C preprocessor macros listed below, either using `#define` in the code or by passing an argument to the compiler. The follwoing options are supported:

+Ripser supports several compile-time options. They are switched on by defining the C preprocessor macros listed below, either using `#define` in the code or by passing an argument to the compiler. The following options are supported:

 

   - `ASSEMBLE_REDUCTION_MATRIX`: store the reduction matrix; may speed up computation but will also increase memory usage

   - `USE_COEFFICIENTS`: enable support for coeffitients in a prime field

@@ -54,7 +57,6 @@ Ripser supports several compile-time options. They are switched on by defining t
   - `PRINT_PERSISTENCE_PAIRS`: output the computed persistence pairs (enabled by default)

   - `USE_GOOGLE_HASHMAP`: enable support for Google's [sparsehash] data structure; may further reducue memory footprint

 

-

 Furthermore, one of the following options needs to be chosen to specify the format for the input files:

 

   - `FILE_FORMAT_LOWER_TRIANGULAR_CSV`: lower triangular distance matrix; a comma separated list of the distance matrix entries below the diagonal, sorted lexicographically by row index and column index

@@ -65,8 +67,14 @@ For example, to build with support for coefficients:
 

 ```sh

 $ c++ -std=c++11 ripser.cpp -o ripser -Ofast -D NDEBUG -D FILE_FORMAT_LOWER_TRIANGULAR_CSV -D USE_COEFFICIENTS

-```

-

+```
+
+The following options are supported at the command line:
+
+  - `--top_dim k`: compute persistent homology up to dimension *k*
+  - `--threshold t`: compute Rips complexes up to diameter *t*
+  - `--modulus p`: compute homology with coefficients in the prime field Z/*p*Z (only available when build with the option `USE_COEFFICIENTS`)
+
 

 ### Planned features

 

@@ -75,10 +83,10 @@ The following features are currently planned for future versions:
  - support for point clouds

  - computation of representative cycles for persistent homology (currenly only *co*cycles are computed)

  - support for sparse distance matrices

+
 

 ### License

 

-

 [LGPL] 3.0