Parsing and serialization functions for the NIST Matrix Market format

LTS Haskell 16.23:
Stackage Nightly 2020-11-23:
Latest on Hackage:

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BSD-2-Clause licensed by Marco Zocca
Maintained by zocca marco gmail
This version can be pinned in stack with:matrix-market-attoparsec-,1878

Module documentation for


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Attoparsec parser for the NIST Matrix Market format [0].

The library also contains functions for serializing matrix data to text file.

User guide

The module Data.Matrix.MatrixMarket exports the user interface:

readMatrix :: FilePath -> IO (Matrix S.Scientific)

readArray :: FilePath -> IO (Array S.Scientific)

writeMatrix :: Show a => FilePath -> Matrix a -> IO ()

writeArray :: Show a => FilePath -> Array a -> IO ()  

The first two functions contain the parsing logic, and make use of scientific for parsing numerical data in scientific notation.

As of version 0.1.1 there are also intermediate functions readMatrix', readArray', writeMatrix' and writeArray' that do not touch the filesystem but (de-)serialize from/to lazy ByteString.

Naming convention

We follow the MatrixMarket format definitions, by which a “Matrix” is sparse and stored in coordinate format (row, column, entry), whereas an “Array” is a dense grid of numbers, stored in column-oriented form. Algebraic vectors, such as the right-hand sides of equation systems, are stored as n-by-1 Arrays.


test/LibSpec.hs contains a simple read/write/read sanity test for the included Matrix Marked data files (fidapm05.mtx and fidapm05_rhs1.mtx):

m0 <- readMatrix fname   -- load original
writeMatrix ftemp m0     -- save as temp
m1 <- readMatrix ftemp   -- load temp
m0 `shouldBe` m1         -- compare temp with original




Expose writeArray’ and readArray’ as well

Add ExportError exception

Add MatrixMarket module from accelerate-examples SMVM