Data.Csv.HMatrix

Usage example

For decoding we have to specify, if there is a header. This can be done with the HasHeader/NoHeader type:

>>> decodeMatrix NoHeader "1.0,2.0,3.0\r\n4.0,5.0,6.0\r\n7.0,8.0,9.0\r\n"
(3><3)
[ 1.0, 2.0, 3.0
, 4.0, 5.0, 6.0
, 7.0, 8.0, 9.0 ]

Cassava, which is used for parsing the .csv files uses overloaded string literals. If you try this in ghci, make sure to start it with the right flag:

>>> ghci -XOverloadedStrings

Encoding a file works pretty much the same, except that we do not need to specify a header.

>>> encodeMatrix $ matrix 3 [1,2,3,4,5,6,7,8,9]
"1.0,2.0,3.0\r\n4.0,5.0,6.0\r\n7.0,8.0,9.0\r\n"

Information

If you want to help improve this library, feel free to file an issue or send a pull-request on github. Every feedback is appreciated. As of now only matrices of type Double are supported.

decodeMatrix

Arguments

:: HasHeader

From Data.Csv: specify if the CSV string has a header

-> ByteString

The ByteString containing the CSVs

-> Matrix Double

The parsed Matrix

Decodes a matrix.

decodeMatrixWith

Arguments

:: HasHeader

From Data.Csv: specify if the CSV string has a header

-> Char

The delimiter

-> ByteString

The ByteString containing the CSVs

-> Matrix Double

The parsed Matrix

Decodes a matrix from ByteString and additionally allow to specify the delimter which was used.

encodeMatrix

Arguments

:: Matrix Double

The Matrix to encode

-> ByteString

The resulting ByteString

Encodes a matrix with comma as delimiter.

encodeMatrixWith

Arguments

:: Char

The delimiter for separating the values

-> Matrix Double

The Matrix to encode

-> ByteString

The resulting ByteString

Encodes a matrix but allows to specify a delimiter.