Getting started (continued)

This section covers advanced use cases: importing data into Relational Context Families, building lattices, and AOC-Posets from imported data.

Import with Family

Build a Relational Context Family (.rcft) from a set of CSV files using the FAMILY command with the IMPORT action.

Input

The example considers 5 CSV files containing 3 formal contexts (FC) and 2 relational contexts (RC):

FC with 10 pizzas with no specific description (pizza.csv)
FC with 14 ingredients, described by season and diet attributes (ingredient.csv)
FC with 5 pizzerias with no specific description (pizzeria.csv)
RC connecting pizzas to the ingredients they contain (pizza2ingredient.csv)
RC connecting pizzerias to the pizzas they offer (pizzeria2pizza.csv)

CSV format

Files contain an unnamed table with attributes in the first row and objects in the first column. Cells contain 0/1 or empty/x.

;summer;winter;vegan;vege;medit
tomato;x;;x;x;x
eggplant;x;;x;x;x
zucchini;x;;x;x;x
redpepper;x;;x;x;x

Output

The output is a file pizzasRCFT.rcft suitable for the RCA command or RCAexplore.

Commands

Step 1 — Import ingredient.csv

Creates pizzasRCFT.rcft with a formal context named "ingredient".

java -jar fca4j-cli.jar FAMILY pizzasRCFT.rcft -a IMPORT ingredient.csv -n ingredient -x CSV -s SEMICOLON

Step 2 — Import pizzeria.csv

java -jar fca4j-cli.jar FAMILY pizzasRCFT.rcft -a IMPORT pizzeria.csv -n pizzeria -x CSV -s SEMICOLON

Step 3 — Import pizza.csv

java -jar fca4j-cli.jar FAMILY pizzasRCFT.rcft -a IMPORT pizza.csv -n pizza -x CSV -s SEMICOLON

Step 4 — Import pizza2ingredient.csv (relational context)

java -jar fca4j-cli.jar FAMILY pizzasRCFT.rcft -a IMPORT pizza2ingredient.csv -n pizza2ingredient -x CSV -v -s SEMICOLON -op exist -source pizza -target ingredient

Step 5 — Import pizzeria2pizza.csv (relational context)

java -jar fca4j-cli.jar FAMILY pizzasRCFT.rcft -a IMPORT pizzeria2pizza.csv -n pizzeria2pizza -x CSV -v -s SEMICOLON -op exist -source pizzeria -target pizza

Extra — Test with the RCA command

Build associated concept lattices in the ./results directory:

mkdir results
java -jar fca4j-cli.jar RCA ./pizzasRCFT.rcft ./results -v -a ADD_EXTENT
dot -Tpdf results/step3.dot -o results/resultat.pdf

For more information, see the RCA command.

Building Lattice from imported data

See the Lattice command for building concept lattices from any formal context.

Building AOC-Poset from imported data

See the AocPoset command for building AOC-Posets.