Update README.md

README.md

@@ -4,13 +4,26 @@
 This is the Julia interface to [ColPack](https://github.com/CSCsw/ColPack).
 
 ## Usage
-```julia
-verbose = 1
-coloring = ColPackColoring("M.mtx", ColPack.d1, "RANDOM", 1)
 
+### Read matrix market file
+```julia
+using ColPack
+using MatrixMarket
+coloring = ColPackColoring("m.mtx", ColPack.d1, "RANDOM")
+println("Number of colors: ", length(unique(get_colors(coloring))))
+println("Vector of vertex colors: ", get_colors(coloring))
+```
+### Pass the adjacency graph as a symmetric matrix of type `SparseMatrixCSC`
+```julia
+using ColPack
+using LinearAlgebra
+using SparseArrays
+A = convert(SparseMatrixCSC, Symmetric(sprand(100,100,0.1)))
+coloring = ColPackColoring(A, ColPack.d1, "RANDOM")
 println("Number of colors: ", length(unique(get_colors(coloring))))
 println("Vector of vertex colors: ", get_colors(coloring))
 ```
-[build-url]: https://github.com/michel2323/ColPack.jl/actions?query=workflow
 
-[build-stable-img]: https://github.com/michel2323/ColPack.jl/workflows/Run%20tests/badge.svg?branch=master
+
+[build-url]: https://github.com/michel2323/ColPack.jl/actions?query=workflow
+[build-stable-img]: https://github.com/michel2323/ColPack.jl/workflows/Run%20tests/badge.svg?branch=master