D-Sci4J

Data Science for Java.

Dependencies

JShell

https://docs.oracle.com/en/java/javase/11/jshell/introduction-jshell.html

JShell Maven Plugin

https://github.com/johnpoth/jshell-maven-plugin

Start d-sci4j

.\pmaven.bat

set JAVA_HOME=E:\jdk\jdk-11.0.6 
REM mvn install
mvn -q jshell:run -Djshell.scripts="config/startup/default-startup"   

Exiting d-sci4j

/exit 

Examples

Tablesaw

• https://github.com/jtablesaw/tablesaw
• https://jtablesaw.github.io/tablesaw/gettingstarted.html

Columns

jshell> double[] numbers = {1, 2, 3, 4};
numbers ==> double[4] { 1.0, 2.0, 3.0, 4.0 }

jshell> DoubleColumn nc = DoubleColumn.create("nc", numbers);
nc ==> Double column: nc

jshell> System.out.println(nc.print());
Column: nc
1
2
3
4

Importing Data

jshell> Table bushTable = Table.read().csv("data/bush.csv");

jshell> System.out.println(bushTable.structure());

jshell> System.out.println(bushTable.last(3))

              bush.csv
    date     |  approval  |   who   |
-------------------------------------
 2001-03-27  |        52  |  zogby  |
 2001-02-27  |        53  |  zogby  |
 2001-02-09  |        57  |  zogby  |


jshell> System.out.println(bushTable.printAll())

            bush.csv
    date     |  approval  |    who     |
----------------------------------------
 2004-02-04  |        53  |       fox  |
 2004-01-21  |        53  |       fox  |
 2004-01-07  |        58  |       fox  |
 2003-12-03  |        52  |       fox  |
 2003-11-18  |        52  |       fox  |
 2003-10-28  |        53  |       fox  |
...... more records

ND4J