smile.io

Class CSV

java.lang.Object

smile.io.CSV

public class CSV
extends java.lang.Object

Reads and writes files in variations of the Comma Separated Value (CSV) format.

Constructor Summary

Constructors

Constructor and Description
CSV() Constructor.
CSV(org.apache.commons.csv.CSVFormat format) Constructor.

Method Summary

Modifier and Type	Method and Description
CSV	charset(java.nio.charset.Charset charset) Sets the charset.
smile.data.type.StructType	inferSchema(java.io.Reader reader, int limit) Infer the schema from the top n rows.
smile.data.DataFrame	read(java.nio.file.Path path) Reads a CSV file.
smile.data.DataFrame	read(java.nio.file.Path path, int limit) Reads a limited number of records from a CSV file.
smile.data.DataFrame	read(java.lang.String path) Reads a CSV file.
smile.data.DataFrame	read(java.lang.String path, int limit) Reads a limited number of records from a CSV file.
CSV	schema(smile.data.type.StructType schema) Sets the schema.
void	write(smile.data.DataFrame df, java.nio.file.Path path) Writes a data frame to a file with UTF-8.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

CSV

public CSV()

Constructor. Standard Comma Separated Value format, as for RFC4180 but allowing empty lines.

CSV

public CSV(org.apache.commons.csv.CSVFormat format)

Constructor.

Parameters:

format - The format of a CSV file.

Method Detail

schema

public CSV schema(smile.data.type.StructType schema)

Sets the schema.

Parameters:

schema - the schema of file.

charset

public CSV charset(java.nio.charset.Charset charset)

Sets the charset.

Parameters:

charset - the charset of file.

read

public smile.data.DataFrame read(java.lang.String path)
                          throws java.io.IOException,
                                 java.net.URISyntaxException

Reads a CSV file.

Parameters:

path - a CSV file path or URI.

Throws:

java.io.IOException

java.net.URISyntaxException

read

public smile.data.DataFrame read(java.lang.String path,
                                 int limit)
                          throws java.io.IOException,
                                 java.net.URISyntaxException

Reads a limited number of records from a CSV file.

Parameters:

path - a CSV file path or URI.

limit - reads a limited number of records.

Throws:

java.io.IOException

java.net.URISyntaxException

read

public smile.data.DataFrame read(java.nio.file.Path path)
                          throws java.io.IOException

Reads a CSV file.

Parameters:

path - a CSV file path.

Throws:

java.io.IOException

read

public smile.data.DataFrame read(java.nio.file.Path path,
                                 int limit)
                          throws java.io.IOException

Reads a limited number of records from a CSV file.

Parameters:

path - a CSV file path.

limit - reads a limited number of records.

Throws:

java.io.IOException

inferSchema

public smile.data.type.StructType inferSchema(java.io.Reader reader,
                                              int limit)
                                       throws java.io.IOException

Infer the schema from the top n rows. - Infer type of each row. - Merge row types to find common type - String type by default.

Throws:

java.io.IOException

write

public void write(smile.data.DataFrame df,
                  java.nio.file.Path path)
           throws java.io.IOException

Writes a data frame to a file with UTF-8.

Throws:

java.io.IOException