Cross-correlation Matrix

>>> from techminer2.packages.correlation.cross import MatrixDataFrame
>>> (
...     MatrixDataFrame()
...     #
...     # FIELD:
...     .with_field("authors")
...     .having_terms_in_top(10)
...     .having_terms_ordered_by("OCC")
...     .having_term_occurrences_between(None, None)
...     .having_term_citations_between(None, None)
...     .having_terms_in(None)
...     #
...     # CROSS WITH:
...     .with_other_field('countries')
...     #
...     # CORRELATION:
...     .with_correlation_method("pearson")
...     #
...     # DATABASE:
...     .where_root_directory_is("example/")
...     .where_database_is("main")
...     .where_record_years_range_is(None, None)
...     .where_record_citations_range_is(None, None)
...     .where_records_match(None)
...     #
...     .run()
... ).round(3)
                      Jagtiani J. 3:0317  ...  Zavolokina L. 2:0181
Jagtiani J. 3:0317                 1.000  ...                   0.0
Gomber P. 2:1065                   0.369  ...                   0.0
Hornuf L. 2:0358                   0.000  ...                   0.0
Gai K. 2:0323                      0.692  ...                   0.0
Qiu M. 2:0323                      0.692  ...                   0.0
Sun X. 2:0323                      0.692  ...                   0.0
Lemieux C. 2:0253                  1.000  ...                   0.0
Dolata M. 2:0181                   0.000  ...                   1.0
Schwabe G. 2:0181                  0.000  ...                   1.0
Zavolokina L. 2:0181               0.000  ...                   1.0

[10 rows x 10 columns]